BA350-EA Modular Storage Shelf ------------------------------------------------------------ User 's Guide Order Number: EK-350EA-UG. A01 This manual describes the BA350-SA modular storage shelf and the rules for configuring the shelf to include power, system building blocks (SBBs), device addressing, and SCSI buses. Procedures for determining shelf status and replacing blowers are also included. Digital Equipment Corporation Maynard, Massachusetts ------------------------------------------------------------ First Edition: November 1992 The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for any errors that may appear in this document. The software described in this document is furnished under a license and may be used or copied only in accordance with the terms of such license. No responsibility is assumed for the use or reliability of software on equipment that is not supplied by Digital Equipment Corporation or its affiliated companies. Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013. Copyright © Digital Equipment Corporation 1992 Printed in U.S.A. All Rights Reserved. The postpaid READER'S COMMENTS card requests the user 's critical evaluation to assist in preparing future documentation. FCC NOTICE: The equipment described in this manual generates, uses, and may emit radio frequency energy. The equipment has been type tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such radio frequency interference when operated in a commercial environment. Operation of this equipment in a residential area may cause interference, in which case the user at his own expense may be required to take measures to correct the interference. AXP, DEC, DEC 10000, MicroVAX, RZ, VAXserver, and the DIGITAL logo are trademarks of Digital Equipment Corporation. This document was prepared using VAX DOCUMENT, Version 2.0. ------------------------------------------------------------ Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v 1 Introducing the BA350-EA Modular Storage Shelf 1.1 BA350-EA Shelf Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 HSx-Series Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.3 Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.4 Shelf Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.4.1 Power Supply LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.4.2 SHELF_OK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 1.5 Replacing SBBs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 1.6 Replacing Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 2 Configuring the BA350-EA Shelf 2.1 Power Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.2 SBB Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.3 SBB Device Addressing Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.4 Configuring a BA350-EA DECstor/me Modular Storage Shelf . . . . . . . . . . 2-4 3 BA350-EA Shelf SCSI Buses 3.1 SCSI Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3.2 5x1 SCSI Bus--Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3.3 5x2 SCSI Bus--Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.4 5x3 SCSI Bus--Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 3.5 5x4 SCSI Bus--Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 3.6 5x5 SCSI Bus--Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 3.7 5x6 SCSI Bus--Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 4 DWZZA-VA Bus Adapter 4.1 Major Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.1.1 Device ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.1.2 SCSI Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.1.3 Terminating the SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.1.4 Terminator Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4.2 Disassembly of the DWZZA-VA Bus Adapter . . . . . . . . . . . . . . . . . . . . . . . 4-4 4.3 Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 iii Index Figures 1-1 BA350-EA Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1-2 Power Supply LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 1-3 SHELF_OK Signal Jumper W1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 1-4 Removing an SBB from the Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 1-5 Replacing Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 2-1 SBB Device Address Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2-2 BA350-EA Shelf--Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 3-1 5x1 Bus Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 3-2 5x2 Bus Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 3-3 5x3 Bus Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 3-4 5x4 Bus Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 3-5 5x5 Bus Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13 3-6 5x6 Bus Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 4-1 BA350-EA Shelf with DWZZA-VA Bus Adapter SBB Installed . . . . . . 4-1 4-2 Typical 3½-Inch SBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 Tables 1-1 BA350 DECstor/me Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2-1 DECstor/me SBB Address Switch Settings . . . . . . . . . . . . . . . . . . . . . 2-3 3-1 Configuring SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3-2 5x1 SCSI Bus Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3-3 5x2 SCSI Bus Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3-4 5x3 SCSI Bus Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 3-5 5x4 SCSI Bus Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 3-6 5x5 SCSI Bus Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 3-7 5x6 SCSI Bus Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 4-1 SCSI Cable Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4-2 DWZZA-VA Bus Adapter Functional Specifications . . . . . . . . . . . . . . . 4-5 iv ------------------------------------------------------------ Preface The BA350-EA Modular Storage Shelf User 's Guide describes how to configure the BA350-EA shelf, and install and replace DECstor/me components. ------------------------------------------------------------ Note ------------------------------------------------------------ Shelf installation procedures are cabinet specific and are not included in this manual. ------------------------------------------------------------ Intended Audience This manual is intended for use by personnel responsible for configuring, using, and installing BA350 DECstor/me modular storage shelf systems. Structure This manual is organized as follows: Chapter 1 Provides a description of the BA350-EA modular storage shelf including components, status signals, and replacement procedures. Chapter 2 Provides shelf-specific configuration rules for power, storage SBBs, shelves, and device addressing. Chapter 3 Provides a detailed description of shelf-specific SCSI buses including terminators, jumpers, and devices by bus and location. Chapter 4 Provides a description of the DWZZA-VA bus adapter used for compatibility between 8-bit differential SCSI buses and 8-bit single- ended SCSI buses. v Related Documents The following table lists documents (alphabetically by title) that contain information related to this product: ------------------------------------------------------------ Document Title Order Number ------------------------------------------------------------ BA350 Modular Storage Shelf SBB User 's Guide EK-SBB35-UG BA350 Modular Storage Shelf Subsystem Configuration Guide EK-BA350-CG BA350 Modular Storage Shelf Subsystem User 's Guide EK-BA350-UG BA350-LA Modular Storage Shelf User 's Guide EK-350LA-UG BA350-SA Modular Storage Shelf User 's Guide EK-350SA-UG BA35X-VA Vertical Mounting Kit User 's Guide EK-350SV-UG BA655 SCSI Disk and Tape PIU Installation Guide EK-BA655-IN Installation Notice--RZ73 Bus Termination and Jumper Installation Guide EK-RZ73X-IS MicroVAX/VAXserver 3100 and DECsystem 5100 RZ25 Installation Guide Addendum EK-RZ2MV-AD RZ Series Disk Drive Reference Manual EK-RZXXD-RM RZ22, RZ23, RZ24 Disk Drive Subsystem Service Manual EK-RZ234-SV RZ24 Hard Disk Drive Installation Guide EK-RZ24I-IS RZ25-S Mounting Bolt/Bracket Installation Instructions EK-RZ25S-IN RZ2x Hard Disk Drive Upgrade Installation Instructions EK-RZ2XH-UG RZ2x Series Drive Bracket Installation Sheet EK-RZ2XD-UG TLZ06 Cassette Tape Drive Installation Guide EK-STEXP-AD TLZ06 Cassette Tape Drive Owner 's Manual EK-TLZ06-OM ------------------------------------------------------------ Documentation Conventions The following conventions are used in this manual: boldface type Boldface type indicates the first instance of terms being defined in text, in the glossary, or both. italic type Italic type indicates emphasis and complete manual titles. In the glossary, italic type is also used to indicate cross-references. vi 1 ------------------------------------------------------------ Introducing the BA350-EA Modular Storage Shelf This manual describes the BA350-EA modular storage shelf including configuration rules, system building blocks (SBBs)+, shelf status, power, blowers, and SCSI buses. 1.1 BA350-EA Shelf Description The BA350-EA shelf is a basic entry subsystem that can be expanded to accommodate two HSx-series controllers, six system building blocks (SBBs), and an adapter. ------------------------------------------------------------ Note ------------------------------------------------------------ The mounting brackets required and the procedures for installing this shelf are unique to each cabinet type and are described in the cabinet-specific user 's guide. ------------------------------------------------------------ The BA350-EA shelf is basically a double-height shelf with a common backplane and requires twice the vertical clearance of a standard, single-height shelf. The BA350-EA shelf can be installed horizontally or vertically in a storage array, in a data center cabinet, or in a BA35X-VA vertical mounting kit (stand). The dimensions of the BA350-EA shelf are as follows: Height--300 millimeters (11.8 inches) Width--445 millimeters (17.5 inches) Depth--350 millimeters (13.8 inches) Weight--22.7 kilograms (50.0 pounds) ------------------------------------------------------------ + SBBs are devices installed in either a 3½-inch or 5¼-inch modular carrier, including disk drives, tape drives, CDROMs, static storage devices, power supplies, adapters, CPUs, and so on. Introducing the BA350-EA Modular Storage Shelf 1-1 Introducing the BA350-EA Modular Storage Shelf 1.1 BA350-EA Shelf Description As shown in Figure 1-1, the upper half of the BA350-EA shelf is for controller devices and the lower half is for storage devices. Figure 1-1 BA350-EA Shelf The BA350-EA modular storage shelf differs from other DECstor/me storage shelves in that: · The SCSI address and the slot number are not always the same. The slot numbers are shown in parentheses when: ------------------------------------------------------------ The slot number and the SCSI address are not the same. ------------------------------------------------------------ The slot does not have a SCSI address. · Both slot 0 and slot 6 of the storage device section of the BA350-EA have a SCSI address of 0. · The BA350-EA shelf requires a power supply in each section (controller and storage). · The controller section of the BA350-EA shelf can accommodate two power supplies and two HSx-series controllers. The positions for the HSx-series controllers are software dependent. The storage device section of the BA350-EA shelf can contain a maximum of one adapter, one power supply, and six 3½-inch SBBs. · The primary power supplies are always installed in slot 7 in both the controller and the storage sections of the BA350-EA shelf. The primary power supply type is determined by the cabinet power distribution unit. · An optional, redundant power supply or a battery backup unit (BBU) can be installed in slot 6 when fewer than six SBBs are already installed. ------------------------------------------------------------ Note ------------------------------------------------------------ Installing a redundant power supply or BBU in the storage device section of the BA350-EA shelf reduces the number of 3½-inch storage devices that can be installed to five. ------------------------------------------------------------ · There are six single-ended SCSI bus connectors located at the bottom of the controller section of the shelf. 1-2 Introducing the BA350-EA Modular Storage Shelf Introducing the BA350-EA Modular Storage Shelf 1.1 BA350-EA Shelf Description Table 1-1 lists the DECstor/me products required for different configurations, based on the number of 3½-inch devices on each of the five SCSI buses. The rules used for developing this table are as follows: · The BA350-EA modular storage shelf can support a maximum of one device per bus. To increase the number of devices per bus requires adding BA350- SA storage shelves. · The primary power supply can be either of the following, based on the type of cabinet power system: - BA350-HA universal ac input power supply - BA350-HB universal dc input power supply Table 1-1 BA350 DECstor/me Products ------------------------------------------------------------ Devices per SCSI Bus Item 1 2 3 4 5 6 ------------------------------------------------------------ BA350-SA shelf 0 1 2 4 4 4 Primary power supply 2 3 4 6 6 6 3½-inch SBB 5 10 15 20 25 30 BA35X-MB SCSI terminator board+ 6 5 4 6 6 6 BA35X-MC SCSI jumper board+ 0 2 2 7 8 8 Mounting bracket kit+ 1 2 3 5 5 5 ------------------------------------------------------------ +One terminator per bus; one jumper per unterminated, extended bus. +Not required for BA35X-VA vertical mounting kit. See cabinet user 's guide for option number. ------------------------------------------------------------ ------------------------------------------------------------ Note ------------------------------------------------------------ The configuration rules in the following sections have precedence over those listed in BA350 Modular Storage Shelf Subsystem User 's Guide. ------------------------------------------------------------ 1.2 HSx-Series Controllers HSx-series controllers can be installed in either the first or third slot. The actual location is software dependent. Refer to the specific controller documentation to determine if the controller can be removed and replaced without removing power from the shelf (hot swap method). See Section 1.5 for more information on hot, cold, and warm swap methods. Whenever the controller is changed, it must be reconfigured, and the software reloaded and retested as described in the specific controller user 's guide. Introducing the BA350-EA Modular Storage Shelf 1-3 Introducing the BA350-EA Modular Storage Shelf 1.3 Adapters 1.3 Adapters A 16-bit differential SCSI system cannot be connected directly to a single-ended, 8-bit SCSI system. However, with the proper adapter, a differential SCSI system operating in the 8-bit mode is compatible with a single-ended SCSI bus. The BA350 modular storage shelf subsystem uses the DWZZA-VA bus adapter for compatibility between these two SCSI bus types. See Chapter 4 for a complete description of and the specifications for the DWZZA adapter. 1.4 Shelf Status Two conditions are monitored for the shelf: cooling and power. The cabinet provides the cooling and the shelf power supply provides the +5 Vdc and +12 Vdc of power to operate the SBBs. When there is an overtemperature condition or a power supply failure, the status is reported to the host or controller and is indicated to the user by the illumination of one or both of the power supply LEDs. 1.4.1 Power Supply LEDs The power supply is shown in Figure 1-2. There are two status LEDs on the front of the power supply: · The upper LED indicates the shelf status. · The lower LED indicates the power supply status. Depending on whether or not either or both of the LEDs are lit indicates one of the following conditions: · When the shelf status (upper) LED is on and the power supply status (lower) LED is on, the temperature is within the proper operating range and the power supplies are functioning properly. · When the shelf status (upper) LED is off and the power supply status (lower) LED is on, there is an overtemperature condition. · When both the shelf status (upper) LED and the power supply status (lower) LED are off, either the power supply has failed or the input voltage is incorrect. 1-4 Introducing the BA350-EA Modular Storage Shelf Introducing the BA350-EA Modular Storage Shelf 1.4 Shelf Status Figure 1-2 Power Supply LEDs ------------------------------------------------------------ ------------------------------------------------------------ SHELFðTx STATUS LEDðTX POWER SUPPLYðTx STATUS LEDðTX ------------------------------------------------------------ CXO-3613A-PHðTX Introducing the BA350-EA Modular Storage Shelf 1.4 Shelf Status 1.4.2 SHELF_OK Signal The shelf status (SHELF_OK) is reported to the host or controller that can process this information. However, since not all hosts and controllers can process this signal, this signal is sent to a compatible host or controller by installing jumper W1 on both the terminator board (BA35X-MB) and the jumper board (BA35X-MC) on each shelf, as shown in Figure 1-3. The terminator board, the jumper board, and jumper W1 are installed prior to shipment. When the SHELF_OK signal is not used, install jumper W1 on the two ground pins shown in Figure 1-3. Figure 1-3 SHELF_OK Signal Jumper W1 1.5 Replacing SBBs There are three methods for replacing SBBs, including power supplies--hot swap, warm swap, and cold swap. A full description of these methods is contained in the BA350 Modular Storage Shelf Subsystem User 's Guide. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ To prevent electrostatic discharge (ESD) damage to an SBB, do not touch the SBB connector. ------------------------------------------------------------ You use the LEDs on the front of the SBB to determine which SBBs are operational and which have failed. · For power supplies, use the hot swap method only when there are two power supplies in a shelf. You can remove the failed power supply while the other furnishes the power. 1-6 Introducing the BA350-EA Modular Storage Shelf Introducing the BA350-EA Modular Storage Shelf 1.5 Replacing SBBs ------------------------------------------------------------ CAUTION ------------------------------------------------------------ When removing or replacing an SBB, always use both hands to support the weight of the SBB. ------------------------------------------------------------ For storage SBBs, you can use the hot swap method provided that the green status LED is off, indicating the unit is not being accessed. · Use the warm swap method when there are multiple shelves in a cabinet and it is necessary to remove power from a particular shelf because the power supply has failed. When this is the case, none of the devices on that shelf are operational until the replacement supply is installed. · Use the cold swap method when input power is removed from all shelves in a cabinet by turning off the power at the power controller. This normally only occurs during initial installation. None of the shelves are operational until the input power is restored. To remove or replace an SBB, use the following procedure: ------------------------------------------------------------ Step Procedure ------------------------------------------------------------ 1. Press the two mounting tabs (as shown in Figure 1-4) to release the SBB and pull the SBB out of the shelf. 2. Insert the replacement SBB into the guide slots and push it in until the tabs lock in place. ------------------------------------------------------------ Figure 1-4 Removing an SBB from the Shelf ------------------------------------------------------------ CXO-3611A-PHðTX Introducing the BA350-EA Modular Storage Shelf 1.6 Replacing Blowers ------------------------------------------------------------ WARNING ------------------------------------------------------------ Service procedures described in this manual that involve blower removal or access to the rear of the shelf must be performed only by qualified service personnel. To reduce the risk of electrical energy hazard, disconnect the power cables from the shelf power SBBs before removing shelf blower assemblies or performing service in the backplane area, such as modifying the SCSI bus. ------------------------------------------------------------ When a blower is removed, the change in the air flow pattern reduces the cooling to the point that the shelf can overheat within 60 seconds. To replace a blower, use the following procedure: ------------------------------------------------------------ Note ------------------------------------------------------------ Replacing a blower requires access to the rear of the shelf. If the rear of the shelf is not accessible, turn off the power, remove the shelf from the cabinet, and perform steps 1 through 6. Then replace the shelf in the cabinet and apply power. ------------------------------------------------------------ ------------------------------------------------------------ Step Procedure ------------------------------------------------------------ 1. Disconnect all power cables to shelf power SBBs. 2. Use a Phillips screwdriver to remove the safety screw in the upper right corner or lower left corner of the blower. 3. As shown in Figure 1-5, press the upper and lower blower mounting tabs in to release the blower. 4. Pull the blower straight out to disconnect it from the shelf power connector. 5. Align the replacement blower connector and push the blower straight in, making sure that both mounting tabs lock in place. 6. Replace the safety screw. 7. Connect the shelf power cables and verify that the shelf and all SBBs are operating properly. ------------------------------------------------------------ 1-8 Introducing the BA350-EA Modular Storage Shelf Introducing the BA350-EA Modular Storage Shelf 1.6 Replacing Blowers Figure 1-5 Replacing Blowers ------------------------------------------------------------ CXO-3515A-PHðTX 2 ------------------------------------------------------------ Configuring the BA350-EA Shelf This chapter describes the rules for configuring a BA350-EA modular storage shelf including power, system building blocks (SBBs), and device addresses. ------------------------------------------------------------ Note ------------------------------------------------------------ The configuration rules in the following sections have precedence over those listed in the BA350 Modular Storage Shelf Subsystem User 's Guide. ------------------------------------------------------------ 2.1 Power Configuration Rules Use the following rules to configure the power for a BA350-EA modular storage shelf: · Each BA350-EA shelf requires either an ac or dc primary power supply, based upon the cabinet power distribution unit. · The primary power supply is installed in slot 7 (power slot). · When slot 6 does not contain a storage SBB, either of the following can be installed: - An optional redundant power supply - An optional battery backup unit (BBU) 2.2 SBB Configuration Rules Use the following rules to configure the SBBs (disk drives, tape drives, and so forth) in the BA350-EA shelf: · The Digital storage devices available for use in the BA350-EA shelf are listed in BA350 Modular Storage Shelf Subsystem Configuration Guide. · The maximum number of SBBs you can install in a BA350-EA modular storage shelf is determined by: -- The SBB physical size (either 3½-inch or 5¼-inch) -- The bus configuration · Software control signals on the SCSI bus are required to ensure that the disk drives on each shelf spin up sequentially. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ To prevent electrostatic discharge (ESD) damage to an SBB, do not touch the SBB connector. ------------------------------------------------------------ Configuring the BA350-EA Shelf 2-1 Configuring the BA350-EA Shelf 2.3 SBB Device Addressing Rules 2.3 SBB Device Addressing Rules Use the following rules to assign device addresses to the SBBs (disk drives, tape drives, and so forth) in a DECstor/me shelf: ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Each device address on a SCSI bus or DECstor/me storage shelf can only be used once. ------------------------------------------------------------ · The maximum number of device addresses per SCSI bus or DECstor/me modular storage shelf is seven. · The SBB device address is determined automatically by its physical location in the shelf unless the SBB has a device address switch. ------------------------------------------------------------ Note ------------------------------------------------------------ Unless specifically stated otherwise, DECstor/me modular storage shelf slot numbers and SCSI addresses are the same. ------------------------------------------------------------ · The 3½-inch tape drive SBBs and all 5¼-inch SBBs have a six-bit address switch located on the rear of the SBB as shown in Figure 2-1. With this switch, you can select a SCSI address in the range 0 through 7. Table 2-1 lists the valid device address switch positions. · Setting the switch to automatic, as described in Table 2-1, enables the automatic addressing mode, which uses the physical position of the SBB to determine the address. · When there is no address switch or you set the switch to automatic, the SBB connector position determines the SCSI device address. For example: - If the SBB connector is in slot 5, the device address is 5. - If the SBB connector is in slot 3, the device address is 3. · The address switch for a 5¼-inch, full-height (FH) SBB is installed adjacent to the center SBB connector. · The address switch for the lower 5¼-inch, half-height (HH) SBB is installed adjacent to the center SBB connector. · The address switch for the upper 5¼-inch, HH SBB is installed adjacent to the left SBB connector. 2-2 Configuring the BA350-EA Shelf Configuring the BA350-EA Shelf 2.3 SBB Device Addressing Rules Table 2-1 DECstor/me SBB Address Switch Settings ------------------------------------------------------------ SCSI Switch Number ------------------------------------------------------------ 1 ------------------------------------------------------------ 2 ------------------------------------------------------------ 3 ------------------------------------------------------------ 4 ------------------------------------------------------------ 5 ------------------------------------------------------------ 6 ------------------------------------------------------------ SCSI address 0 Off Off Off Off Off Off SCSI address 1 On Off Off Off Off Off SCSI address 2 Off On Off Off Off Off SCSI address 3 On On Off Off Off Off SCSI address 4 Off Off On Off Off Off SCSI address 5 On Off On Off Off Off SCSI address 6 Off On On Off Off Off SCSI address 7 1 On On On Off Off Off Automatic Off Off Off On On On ------------------------------------------------------------ 1 SCSI address 7 is generally reserved for the host. ------------------------------------------------------------ Figure 2-1 SBB Device Address Switch Configuring the BA350-EA Shelf 2-3 Configuring the BA350-EA Shelf 2.4 Configuring a BA350-EA DECstor/me Modular Storage Shelf 2.4 Configuring a BA350-EA DECstor/me Modular Storage Shelf The BA350-EA modular storage shelf shown in Figure 2-2 differs from other DECstor/me shelves in that: · The SBB slot number and the SCSI device address are not always the same. · Two slots have SCSI device address 0: slot 0 and slot 6. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ SCSI device address 0 is assigned to both slot 0 and slot 6. Do not install storage SBBs in slot 0 and slot 6 at the same time. ------------------------------------------------------------ · The SCSI address and the slot number are not the same for all slots. When there is a difference between the slot number and the SCSI address, or there is no SCSI address, the slot number is shown in parentheses. Figure 2-2 BA350-EA Shelf--Front View · Slot 0 is normally used for an adapter. · There are six terminators or jumper connectors on the rear of the backplane behind storage shelf slots 1 through 5 and slot 7, the power slot, respectively. ------------------------------------------------------------ Note ------------------------------------------------------------ A terminator board (BA35X-MB) must be installed in the slot 1 connector on the rear backplane for all configurations. ------------------------------------------------------------ · Each terminator and jumper board requires that jumper W1 be installed to pass the SHELF_OK signal to compatible hosts and controllers. ------------------------------------------------------------ Note ------------------------------------------------------------ Read the specific controller documentation to determine if the controller can process the SHELF_OK signal. ------------------------------------------------------------ 2-4 Configuring the BA350-EA Shelf Configuring the BA350-EA Shelf 2.4 Configuring a BA350-EA DECstor/me Modular Storage Shelf · The primary power supply is installed in slot 7 on both the controller and the storage shelf. Slot 6 on both shelves can be used for a redundant power supply or a battery backup unit (BBU). Configuring the BA350-EA Shelf 2-5 3 ------------------------------------------------------------ BA350-EA Shelf SCSI Buses This chapter describes the factory SCSI bus configurations of the BA350-EA and BA350-SA shelves when using an HSZ10-AX controller, including the terminators, jumpers, and SBBs. The SCSI bus components (that is, jumpers, terminators, and SBBs) and their physical locations are also defined. ------------------------------------------------------------ Note ------------------------------------------------------------ The SCSI bus factory configurations described in this chapter are only valid when using the HSZ10-AX controller. ------------------------------------------------------------ The BA350-EA has six single-ended SCSI bus connectors mounted at the bottom of the controller shelf on the front of the backplane. The cables for these connectors exit through the front of the shelf. Each bus requires a terminator at both ends. Jumpers are required for extending a bus. The terminator and jumper connectors are mounted on the rear of the backplane. You must remove the blowers to configure the SCSI buses. The use of the jumpers is determined by the number of drives installed. The basic HSZ10 5x1 bus does not require any jumpers. Jumpers are required for all the other bus configurations (that is, 5x2 through 5x6). See Section 3.1 for more information on SCSI bus configurations. ------------------------------------------------------------ Note ------------------------------------------------------------ Be sure to place unused jumpers where you can readily find them. After you have configured and tested your buses, you can mount the extra jumpers on unused backplane connectors without affecting bus operation. ------------------------------------------------------------ ------------------------------------------------------------ WARNING ------------------------------------------------------------ Service procedures described in this manual involving blower removal or access to the rear of the shelf must be performed only by qualified service personnel. To reduce the risk of electrical energy hazard, disconnect the power cables from the shelf power SBBs before removing shelf blower assemblies or performing service in the backplane area, such as modifying the SCSI bus. ------------------------------------------------------------ BA350-EA Shelf SCSI Buses 3-1 BA350-EA Shelf SCSI Buses To initially configure the buses, complete the following procedure: Table 3-1 Configuring SCSI Buses ------------------------------------------------------------ Step Procedure ------------------------------------------------------------ 1. Select the bus configuration from Sections 3.2 through 3.7. 2. Turn off power to the shelves. 3. If you cannot access the rear of the shelf, remove the shelf from the cabinet. 4. Remove the blowers from the shelf as described in Section 1.6. 5. Ground yourself by pressing a finger to an open space on the backplane. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ To prevent ESD damage to devices on the SCSI bus, do not touch the SBB backplane connector pins. ------------------------------------------------------------ 6. Install jumper W1 on all terminator boards (BA35X-MB) and jumper boards (BA35X-MC) to either enable or disable the SHELF_OK signal. (Refer to Section 1.4.2.) 7. Position terminators and jumpers as shown in Figures 3-1 through 3-6. 8. Position the storage devices as shown in Figures 3-1 through 3-6. 9. Repeat Steps 2 through 8 for all shelves. 10. Replace the shelves that were removed in step 3. 11. Apply power to all shelves and verify proper operation. ------------------------------------------------------------ ------------------------------------------------------------ Note ------------------------------------------------------------ The following diagrams show the SCSI bus address for each BA350 modular shelf slot. Normally, the device address and the slot number are the same. When there is a difference or there is no device address, the slot number is shown in parentheses. ------------------------------------------------------------ Sections 3.2 through 3.7 define the BA350-EA shelf factory configurations when using the HSZ10-AX controller. For each bus, there is a table that describes the components required (for example, buses, SBBs, terminators, and so forth), the buses for each shelf, and the location, by slot, of the terminators and jumpers. There is also a schematic diagram showing the same information. 3-2 BA350-EA Shelf SCSI Buses BA350-EA Shelf SCSI Buses 3.1 SCSI Bus Configurations 3.1 SCSI Bus Configurations SCSI bus configurations are identified by a three-character descriptor which defines: · The number of SCSI buses · The maximum number of SBBs (that is, devices or ranks allowable per bus) This descriptor is also used to define the maximum number of SBBs per configuration. For example, a 5x3 SCSI bus configuration indicates that there are five SCSI buses and three SBBs per bus. This configuration can accommodate a maximum of 15 SBBs. BA350-EA Shelf SCSI Buses 3-3 BA350-EA Shelf SCSI Buses 3.2 5x1 SCSI Bus--Factory Configuration 3.2 5x1 SCSI Bus--Factory Configuration The 5x1 SCSI bus configuration does not require any jumpers or internal SCSI cables. Table 3-2 defines the 5x1 SCSI bus components and their physical locations. Figure 3-1 is a schematic of this configuration. Table 3-2 5x1 SCSI Bus Components ------------------------------------------------------------ Item BA350-EA ------------------------------------------------------------ SCSI Buses: 5 ------------------------------------------------------------ SCSI bus 1 SCSI bus 2 SCSI bus 3 SCSI bus 4 SCSI bus 5 ------------------------------------------------------------ Terminators (BA35X-MB): 6 ------------------------------------------------------------ Slot 1+ SCSI bus 1 Slot 7 SCSI bus 2 Slot 5 SCSI bus 3 Slot 4 SCSI bus 4 Slot 3 SCSI bus 5 Slot 2 ------------------------------------------------------------ Jumpers (BA35X-MC): None ------------------------------------------------------------ ------------------------------------------------------------ 3½-Inch Storage SBBs: 5 ------------------------------------------------------------ SCSI bus 1 Slot 5 SCSI bus 2 Slot 4 SCSI bus 3 Slot 3 SCSI bus 4 Slot 2 SCSI bus 5 Slot 1 ------------------------------------------------------------ +Install this terminator for all configurations. ------------------------------------------------------------ 3-4 BA350-EA Shelf SCSI Buses BA350-EA Shelf SCSI Buses 3.2 5x1 SCSI Bus--Factory Configuration Figure 3-1 5x1 Bus Schematic BA350-EA Shelf SCSI Buses 3-5 BA350-EA Shelf SCSI Buses 3.3 5x2 SCSI Bus--Factory Configuration 3.3 5x2 SCSI Bus--Factory Configuration Table 3-3 defines the 5x2 SCSI bus components and their physical locations. Figure 3-2 is a schematic of this configuration. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Do not use the following configuration when upgrading, as it can damage SCSI devices. ------------------------------------------------------------ Table 3-3 5x2 SCSI Bus Components ------------------------------------------------------------ Item BA350-EA First BA350-SA ------------------------------------------------------------ SCSI Buses: 5 ------------------------------------------------------------ SCSI bus 1 SCSI bus 2 SCSI bus 3 SCSI bus 4 SCSI bus 5 ------------------------------------------------------------ Terminators (BA35X-MB): 5 ------------------------------------------------------------ Slot 1+ SCSI bus 1 SCSI bus 2 Slot 7 SCSI bus 4 SCSI bus 3 Slot 5 Slot 5 SCSI bus 5 Slot 3 ------------------------------------------------------------ Jumpers (BA35X-MC): 2 ------------------------------------------------------------ SCSI bus 3 Slot 4 SCSI bus 5 Slot 2 ------------------------------------------------------------ 3½-Inch Storage SBBs: 10 ------------------------------------------------------------ SCSI bus 1 Slot 5 Slot 6 SCSI bus 3 Slot 3 Slot 4 SCSI bus 5 Slot 1 Slot 2 SCSI bus 2 Slot 2 Slot 4 SCSI bus 4 Slot 3 Slot 5 ------------------------------------------------------------ +Install this terminator for all configurations. ------------------------------------------------------------ 3-6 BA350-EA Shelf SCSI Buses BA350-EA Shelf SCSI Buses 3.3 5x2 SCSI Bus--Factory Configuration Figure 3-2 5x2 Bus Schematic BA350-EA Shelf SCSI Buses 3-7 BA350-EA Shelf SCSI Buses 3.4 5x3 SCSI Bus--Factory Configuration 3.4 5x3 SCSI Bus--Factory Configuration Table 3-4 defines the 5x3 SCSI bus components and their physical locations. Figure 3-3 is a schematic of this configuration. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Do not use the following configuration when upgrading, as it can damage SCSI devices. ------------------------------------------------------------ Table 3-4 5x3 SCSI Bus Components ------------------------------------------------------------ Item BA350-EA First BA350-SA Second BA350-SA ------------------------------------------------------------ SCSI Buses: 5 ------------------------------------------------------------ SCSI bus 5 SCSI bus 1 SCSI bus 2 SCSI bus 3 SCSI bus 4 ------------------------------------------------------------ Terminators (BA35X-MB): 4 ------------------------------------------------------------ Slot 1+ SCSI bus 5 Slot 5 SCSI bus 1 SCSI bus 2 Slot 5 SCSI bus 3 SCSI bus 4 Slot 5 ------------------------------------------------------------ Jumpers (BA35X-MC): 2 ------------------------------------------------------------ SCSI bus 5 Slot 2 Slot 3 ------------------------------------------------------------ 3½-Inch Storage SBBs: 15 ------------------------------------------------------------ SCSI bus 5 Slot 1 Slot 2 Slot 3 SCSI bus 1 Slot 0 Slot 2 Slot 4 SCSI bus 2 Slot 1 Slot 3 Slot 5 SCSI bus 3 Slot 0 Slot 2 Slot 4 SCSI bus 4 Slot 1 Slot 3 Slot 5 ------------------------------------------------------------ +Install this terminator for all configurations. ------------------------------------------------------------ 3-8 BA350-EA Shelf SCSI Buses BA350-EA Shelf SCSI Buses 3.4 5x3 SCSI Bus--Factory Configuration Figure 3-3 5x3 Bus Schematic BA350-EA Shelf SCSI Buses 3-9 BA350-EA Shelf SCSI Buses 3.5 5x4 SCSI Bus--Factory Configuration 3.5 5x4 SCSI Bus--Factory Configuration Table 3-5 defines the 5x4 SCSI bus components and their physical locations. Figure 3-4 is a schematic of this configuration. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Do not use the following configuration when upgrading, as it can damage SCSI devices. ------------------------------------------------------------ Table 3-5 5x4 SCSI Bus Components ------------------------------------------------------------ Item BA350-EA First BA350-SA Second BA350-SA Third BA350-SA Fourth BA350-SA ------------------------------------------------------------ SCSI Buses: 5 ------------------------------------------------------------ SCSI bus 5 SCSI bus 1 SCSI bus 2 SCSI bus 3 SCSI bus 4 ------------------------------------------------------------ Terminators (BA35X-MB): 6 ------------------------------------------------------------ Slot 1+ Slot 5 Slot 1 Slot 1 Slot 1 Slot 1 ------------------------------------------------------------ Jumpers (BA35X-MC): 7 ------------------------------------------------------------ Slot 2 Slot 3 Slot 4 Slot 5 Slot 5 Slot 5 Slot 5 ------------------------------------------------------------ 3½-Inch Storage SBBs: 20 ------------------------------------------------------------ Slot 1 Slot 2 Slot 3 Slot 4 Slot 2 Slot 3 Slot 4 Slot 5 Slot 2 Slot 3 Slot 4 Slot 5 Slot 2 Slot 3 Slot 4 Slot 5 Slot 2 Slot 3 Slot 4 Slot 5 ------------------------------------------------------------ +Install this terminator for all configurations. ------------------------------------------------------------ 3-10 BA350-EA Shelf SCSI Buses BA350-EA Shelf SCSI Buses 3.5 5x4 SCSI Bus--Factory Configuration Figure 3-4 5x4 Bus Schematic BA350-EA Shelf SCSI Buses 3-11 BA350-EA Shelf SCSI Buses 3.6 5x5 SCSI Bus--Factory Configuration 3.6 5x5 SCSI Bus--Factory Configuration Table 3-6 defines the 5x5 SCSI bus components and their physical locations. Figure 3-5 is a schematic of this configuration. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Do not use the following configuration when upgrading, as it can damage SCSI devices. ------------------------------------------------------------ Table 3-6 5x5 SCSI Bus Components ------------------------------------------------------------ Item BA350-EA First BA350-SA Second BA350-SA Third BA350-SA Fourth BA350-SA ------------------------------------------------------------ SCSI Buses: 5 ------------------------------------------------------------ SCSI bus 5 SCSI bus 1 SCSI bus 2 SCSI bus 3 SCSI bus 4 ------------------------------------------------------------ Terminators (BA35X-MB): 6 ------------------------------------------------------------ Slot 1+ Slot 7 Slot 1 Slot 1 Slot 1 Slot 1 ------------------------------------------------------------ Jumpers (BA35X-MC): 8 ------------------------------------------------------------ Slot 2 Slot 3 Slot 4 Slot 5 Slot 5 Slot 5 Slot 5 Slot 5 ------------------------------------------------------------ 3½-Inch Storage SBBs: 25 ------------------------------------------------------------ Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 ------------------------------------------------------------ +Install this terminator for all configurations. ------------------------------------------------------------ 3-12 BA350-EA Shelf SCSI Buses BA350-EA Shelf SCSI Buses 3.6 5x5 SCSI Bus--Factory Configuration Figure 3-5 5x5 Bus Schematic BA350-EA Shelf SCSI Buses 3-13 BA350-EA Shelf SCSI Buses 3.7 5x6 SCSI Bus--Factory Configuration 3.7 5x6 SCSI Bus--Factory Configuration Table 3-7 defines the 5x6 SCSI bus components and their physical locations. Figure 3-6 is a schematic of this configuration. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Do not use the following configuration when upgrading, as it can damage SCSI devices. ------------------------------------------------------------ Table 3-7 5x6 SCSI Bus Components ------------------------------------------------------------ Item BA350-EA First BA350-SA Second BA350-SA Third BA350-SA Fourth BA350-SA ------------------------------------------------------------ SCSI Buses: 5 ------------------------------------------------------------ SCSI bus 5 SCSI bus 1 SCSI bus 2 SCSI bus 3 SCSI bus 4 ------------------------------------------------------------ Terminators (BA35X-MB): 6 ------------------------------------------------------------ Slot 1+ Slot 7 Slot 1 Slot 1 Slot 1 Slot 1 ------------------------------------------------------------ Jumpers (BA35X-MC): 8 ------------------------------------------------------------ Slot 2 Slot 3 Slot 4 Slot 5 Slot 5 Slot 5 Slot 5 Slot 5 ------------------------------------------------------------ 3½-Inch Storage SBBs: 30 ------------------------------------------------------------ Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6 Slot 0 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 0 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 0 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 0 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 ------------------------------------------------------------ +Install this terminator for all configurations. ------------------------------------------------------------ 3-14 BA350-EA Shelf SCSI Buses BA350-EA Shelf SCSI Buses 3.7 5x6 SCSI Bus--Factory Configuration Figure 3-6 5x6 Bus Schematic BA350-EA Shelf SCSI Buses 3-15 4 ------------------------------------------------------------ DWZZA-VA Bus Adapter The DECstor/me modular storage shelf subsystem uses the DWZZA-VA bus adapter for compatibility between the two SCSI bus types. The DWZZA-VA bus adapter is mounted in a 3½-inch system building block (SBB). The DWZZA-VA bus adapter can only be installed in slot 0 of a storage shelf, as shown in Figure 4-1. The DWZZA-VA bus adapter is connected to the HSx controller with a cable and to the host by the SCSI cable connected to SCSI connector 6. Figure 4-1 BA350-EA Shelf with DWZZA-VA Bus Adapter SBB Installed The DWZZA-VA bus adapter is mounted in a standard 3½-inch SBB and is always mounted in slot 0 of a DECstor/me shelf. 4.1 Major Features The major features of the DWZZA-VA bus adapter are as follows: · No SCSI device modification is required. · The use of two DWZZA-VA bus adapters extends the effective length of a synchronous, single-ended SCSI bus to 31 meters (102 feet). · Data transfers are supported at rates of up to 10 Megabytes/second. · A SCSI device address is not used. DWZZA-VA Bus Adapter 4-1 DWZZA-VA Bus Adapter 4.1 Major Features · Two physical buses are converted into one logical bus with a total of eight device addresses (0 through 7). · Both buses are terminated in the end-bus configuration. · Either bus can be terminated in the mid-bus configuration. · DWZZA-VA bus adapter operation is transparent to both buses. · SCSI-2 bus phases are supported. 4.1.1 Device ID The DWZZA-VA bus adapter does not pass the SCSI shelf ID data to the differential SCSI device. Therefore, no device conflict exists with shelf slot 0 and SCSI hosts, which are manually set to SCSI ID 6 or 7. 4.1.2 SCSI Cables The SCSI cables used with the DWZZA-VA bus adapter and the HSZ10-AX controller are shown in Table 4-1. Table 4-1 SCSI Cable Types ------------------------------------------------------------ Cable Number Connectors ------------------------------------------------------------ Single-Ended Host to BA350-EA Shelf ------------------------------------------------------------ BN21H 50-pin, high density, male, straight 50-pin, high density, male, right-angle, 2-56 jackscrews BN21J 50-pin, high density, male, straight 50-pin, high density, male, straight ------------------------------------------------------------ DWZZA-VA Bus Adapter to HSx Series Controller ------------------------------------------------------------ BN21L 68-pin, high density, male, right-angle, 2-56 jackscrews 68-pin, high density, male, right-angle, 2-56 jackscrews ------------------------------------------------------------ 4.1.3 Terminating the SCSI Buses All SCSI buses are terminated at the physical ends of the bus or cable. The configuration shown in Figure 4-1 is terminated in the following manner: · The single-ended host is connected to the adapter using SCSI connector 6 on the BA350-EA modular storage shelf. The procedures for terminating the single-ended bus are: - Install a single-ended bus terminator on the host. - Install jumper J2 on the DWZZA-VA bus adapter to enable the single- ended bus terminators. · The DWZZA-VA bus adapter and the HSZ10-AX controller are connected by a 68-pin cable. Terminate the differential bus cables as follows: - Install differential bus terminators on the HSZ10-AX controller. - Install five SIP (single in-line package) resistors in the DWZZA-VA bus adapter at the adapter end of the differential bus cable. 4-2 DWZZA-VA Bus Adapter DWZZA-VA Bus Adapter 4.1 Major Features ------------------------------------------------------------ Note ------------------------------------------------------------ See the DWZZA-VA bus adapter documentation for jumper and SIP installation procedures. ------------------------------------------------------------ 4.1.4 Terminator Power The DWZZA-VA bus adapter supplies power to the SCSI terminators (TERMPOWER). TERMPOWER is current limited by self-resetting fuses. DWZZA-VA Bus Adapter 4-3 DWZZA-VA Bus Adapter 4.2 Disassembly of the DWZZA-VA Bus Adapter 4.2 Disassembly of the DWZZA-VA Bus Adapter Remove the SBB bezel and the cover to install or remove bus terminators in the DWZZA-VA bus adapter as shown in Figure 4-2. Both the bezel and cover are secured with four mounting tabs. Use a small screwdriver to press in the ends of the mounting tabs. Figure 4-2 Typical 3½-Inch SBB ------------------------------------------------------------ COVERðTX CASEðTX BEZELðTX ------------------------------------------------------------ ------------------------------------------------------------ ------------------------------------------------------------ CXO-3645A-PHðTX DWZZA-VA Bus Adapter 4.2 Disassembly of the DWZZA-VA Bus Adapter To change the DWZZA-VA bus adapter terminators, use the following procedure: ------------------------------------------------------------ Step Procedure ------------------------------------------------------------ 1. After removing power, disconnect the SCSI cable from the front of the DWZZA-VA bus adapter and remove the adapter from the shelf. 2. Remove the bezel by pushing down on the end of the upper mounting tabs in the base and cover while pulling the top of the bezel away from the SBB. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Use minimal pressure when pushing down on the mounting tabs to prevent damage. ------------------------------------------------------------ 3. Remove the cover by pushing down on the end of the upper mounting tabs while pulling the top of the cover away from the base. 4. Configure the SCSI bus terminators by installing or removing the J2 jumper or the five SIP resistors. 5. Replace the cover by inserting the bottom mounting tabs into the SBB base mounting holes. Align the top mounting tabs with the base and snap the cover into place. 6. Replace the bezel by inserting the bottom mounting tabs into the bottom mounting holes in the base and cover. Align the top mounting tabs with mounting holes in the base and cover and snap the bezel into place. 7. Install the SBB in the shelf, connect the SCSI cable, and apply power to the shelf. 8. Verify that the SCSI bus and devices are functioning properly. ------------------------------------------------------------ 4.3 Functional Specifications The DWZZA-VA bus adapter meets the environmental specifications defined in the BA350 Storage Shelf Subsystem User 's Guide for a DECstor/me modular storage shelf subsystem. Table 4-2 lists the functional specifications of this device. Table 4-2 DWZZA-VA Bus Adapter Functional Specifications ------------------------------------------------------------ Power requirements Input voltage +5 Vdc, +/-0.25 volts. Input current: Electronics 1.5 amps. Terminators 0 to 3 amps. TERMPOWER supplied to both buses. Maximum Power 22.5 watts. Electrical interface Single-ended SCSI to differential SCSI. 8 bits plus parity. Fast SCSI on both buses. Connectors Single ended DECstor/me compatible 96-pin DIN Connector. (continued on next page) DWZZA-VA Bus Adapter 4-5 DWZZA-VA Bus Adapter 4.3 Functional Specifications Table 4-2 (Cont.) DWZZA-VA Bus Adapter Functional Specifications ------------------------------------------------------------ Differential 68-pin panel mounted SCSI "P" connector. Termination End-bus use Mid-bus use Install or enable terminators. Remove or disable terminators. Single ended User selected 8-bit active termination (J2 installed = enabled). Differential 16-bit wide user removable resistors. SCSI device address No SCSI device addresses are used. Overload protection DTERMPOWER: 1.5 amp self-resetting thermal fuse. STERMPOWER: 1.5 amp self-resetting thermal fuse. Diode protection DTERMPOWER isolated from Vcc by Schottky diodes. STERMPOWER isolated from Vcc by Schottky diodes. Shielding SBB and differential connector shielded for ESD, EMI, and safety requirements. Replacement The DWZZA-VA bus adapter can be replaced using the hot swap method. The DWZZA-VA bus adapter can be turned on or off without inducing noise on either bus or causing electrical malfunction. RESET Power-up reset and SCSI bus reset automatically clear the initiator/target detection circuits and BSY noise filter. DECstor/me status signals The DECstor/me single-ended TTL logic signals are available on the following connector pins: Single Ended Differential Connector Pin Connector Pin 20 SWAP_L 40 22 SHELF_OK H 50 30 FAULT_CLK_H 55 34 FAULT_DATA_H 40 SCSI cable or bus length Single-ended Asynchronous 6 m (19.7 ft) Synchronous 3 m (9.8 ft) Differential 25 m (82 ft) Cable fault signals DEVIOUSNESS SCSI bus Special features BSY GLITCH TRAP+ Eliminates cable length constraint due to wired OR noise on BSY line. ------------------------------------------------------------ +Patent Pending ------------------------------------------------------------ 4-6 DWZZA-VA Bus Adapter ------------------------------------------------------------ Index 5x1 SCSI bus components description, 3-4 configuration description, 3-4 5x2 SCSI bus components description, 3-6 configuration description, 3-6 5x3 SCSI bus components description, 3-8 configuration description, 3-8 5x4 SCSI bus components description, 3-10 configuration description, 3-10 5x5 SCSI bus components description, 3-12 configuration description, 3-12 5x6 SCSI bus components description, 3-14 configuration description, 3-14 A ------------------------------------------------------------ Adapters DWZZA-VA, 1-4 Address switch settings SBBs, 2-2 B ------------------------------------------------------------ BA350-EA shelf components, 1-2 configuration rules, 2-4 controller section, 1-2 description, 1-1 dimensions, 1-1 storage section, 1-2 with HSZ10-AX controller, 3-2 Blowers replacing, 1-7, 1-8 C ------------------------------------------------------------ Configuration rules BA350-EA shelf, 2-4 power supply, 2-1 SBBs, 2-1 D ------------------------------------------------------------ DECstor/me products, 1-3 Device addressing rules SBBs, 2-2 Device ID DWZZA-VA bus adapter, 4-2 Differences from other DECstor/me shelves, 1-2 Documents related, vi DWZZA-VA bus adapter, 4-1 description, 4-1 device ID, 4-2 disassembly, 4-4, 4-5 functional specifications, 4-5 major features, 4-1 power supply, 4-3 SCSI cables, 4-2 F ------------------------------------------------------------ Functional specifications DWZZA-VA bus adapter, 4-5 H ------------------------------------------------------------ HSx-series controllers installation, 1-3 location, 1-3 HSZ10-AX controller with BA350-EA shelf, 3-2 with SCSI bus, 3-2 Index-1 P ------------------------------------------------------------ Power supply configuration rules, 2-1 DWZZA-VA bus adapter, 4-3 location in shelf, 1-2 options, 1-2, 2-1 redundant, 1-2 requirements, 1-2, 1-3 Power supply LEDs shelf status, 1-4 S ------------------------------------------------------------ SBBs address switch settings, 2-2 configuration rules, 2-1 definition, 1-1 device addressing rules, 2-2 removing, 1-7 replacing, 1-6, 1-7 cold swap method, 1-7 hot swap method, 1-6 warm swap method, 1-7 SCSI bus configuration, 3-1, 3-3 description, 3-3 procedure for configuration, 3-2 requirements, 3-1 with HSZ10-AX controller, 3-2 SCSI bus configuration terminators, 4-2 SCSI cables used with DWZZA-VA bus adapter, 4-2 Shelf status, 1-4 power supply LEDs, 1-4 SHELF_OK status signal, 1-6 T ------------------------------------------------------------ Terminators power supply, 4-3 SCSI bus, 4-2 Index-2