StorageWorks Family ------------------------------------------------------------ BA350-MA Controller Shelf User 's Guide Order Number: EK-350MA-UG. A02 This manual describes the BA350-MA StorageWorks controller shelf and the rules for configuring the shelf and its associated power supplies, device addresses, and SCSI buses. Procedures for replacing power supplies, blowers, and shelves are also described. Digital Equipment Corporation Maynard, Massachusetts ------------------------------------------------------------ July 1993 While Digital believes the information included in this publication is correct as of the date of publication, it is subject to change without notice. Digital Equipment Corporation makes no representations that the interconnection of its products in the manner described in this document will not infringe existing or future patent rights, nor do the descriptions contained in this document imply the granting of licenses to make, use, or sell equipment or software in accordance with the description. © Digital Equipment Corporation 1992, 1993. All Rights Reserved. Printed in the United States of America. NOTE: This equipment 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 digital device pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. Any changes or modifications made to this equipment may void the user 's authority to operate the equipment. Operation of this equipment in a residential area may cause interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference. DEC, RZ, StorageWorks, and the DIGITAL logo are trademarks of Digital Equipment Corporation. The postpaid READER'S COMMENTS card requests the user 's critical evaluation to assist in preparing future documentation. This document was prepared using VAX DOCUMENT, Version 2.1. ------------------------------------------------------------ Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Manufacturer 's Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix 1 Introducing the BA350-MA StorageWorks Controller Shelf 1.1 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 BA350-MA Controller Shelf Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 2 Configuration Rules 2.1 SBB Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.2 Power Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.3 SCSI Device Addressing Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 3 SCSI Bus Configurations 3.1 SCSI Bus Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.2 Calculating the SCSI Bus Length for a Single SBB Shelf . . . . . . . . . . . . . 3-2 3.3 Calculating the SCSI Bus Length for Multiple SBB Shelves . . . . . . . . . . . 3-2 3.4 Configuring SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3.4.1 3½-Inch SBB SCSI Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . . 3-5 3.4.2 6x1 to 6x3 3½-Inch Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.4.3 6x1 to 6x7 3½-Inch Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . . 3-8 3.4.4 5¼-Inch Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 4 Replacement Procedures 4.1 Replacing a Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.2 Replacing a Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 4.3 Replacing a StorageWorks Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 4.3.1 Removing a Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 4.3.2 Installing a Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Glossary iii Index Figures 1-1 BA350-MA StorageWorks Controller Shelf . . . . . . . . . . . . . . . . . . . . . 1-1 1-2 BA350-MA Controller Shelf Layout . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1-3 Shelf Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2-1 BA350 MA Controller Shelf Device Addresses . . . . . . . . . . . . . . . . . . 2-2 3-1 6x1 to 6x3 3½-Inch Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 3-2 6x4 to 6x7 3½-Inch Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 3-3 6x1 to 6x4 5¼-Inch Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 4-1 Removing a Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4-2 Replacing Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 Tables 1 StorageWorks Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . vi 1-1 BA350-MA StorageWorks Controller Shelf Products . . . . . . . . . . . . . 1-4 3-1 Single-Ended, SCSI-2 Bus Parameters . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3-2 BA350-MA Controller Shelf System SCSI Bus Segments . . . . . . . . . . 3-3 iv ------------------------------------------------------------ Preface The StorageWorks Family BA350-MA Controller Shelf User 's Guide describes the procedures for configuring, installing, and replacing the BA350-MA controller shelf and its components. Intended Audience This manual is intended for use by personnel who will be configuring, using, or replacing the BA350-MA StorageWorks(TM) controller shelves. ------------------------------------------------------------ Note ------------------------------------------------------------ Shelf installation procedures are cabinet specific and are not included in this manual. ------------------------------------------------------------ Structure This manual is organized as follows: Chapter 1 Describes the BA350-MA StorageWorks controller shelf to include physical characteristics, layout, components, and StorageWorks products. Chapter 2 Describes the rules for configuring a BA350-MA controller shelf with an HSJ40 installed. Chapter 3 Describes the shelf-specific SCSI buses, to include calculating bus length, positioning terminators and jumpers, and determining device location. Chapter 4 Describes the procedures for replacing the StorageWorks power supplies, blowers, and shelves. Glossary Contains definitions of BA350-MA controller shelf terms. Index Provides a cross-reference to major topics. v Related Documents Table 1 lists the StorageWorks related user documents organized by use, system, or product. Table 1 StorageWorks Related Documentation ------------------------------------------------------------ Document Title Order Number ------------------------------------------------------------ StorageWorks Primary Publications+ ------------------------------------------------------------ StorageWorks Family Configuration Guide EK-BA350-CG StorageWorks Family User 's Guide+ EK-BA350-UG StorageWorks Family StorageWorks Building Blocks User 's Guide EK-SBB35-UG ------------------------------------------------------------ StorageWorks RAID Array 110 Subsystem ------------------------------------------------------------ BA350-EA Modular Storage Shelf User 's Guide EK-350EA-UG BA35X-VA Vertical Mounting Kit User 's Guide EK-350SV-UG DEC RAID Utilities User 's Guide EK-DECRA-UG StorageWorks RAID Array 110 Subsystem User 's Guide EK-SZ200-UG ------------------------------------------------------------ StorageWorks Array Controller 140-Series ------------------------------------------------------------ StorageWorks Array Controller HS Family of Array Controllers User 's Guide EK-HSFAM-UG StorageWorks BA350-MA Controller Shelf User 's Guide EK-350MA-UG ------------------------------------------------------------ DECraid+ Rackmount Storage Subsystem HSC Intelligent I/O Servers ------------------------------------------------------------ HSC Controller User 's Guide AA-PFSQA-TK HSC Controller Installation Manual EK-HSCMN-IN ------------------------------------------------------------ StorageWorks Enclosures ------------------------------------------------------------ BA35X-VA Vertical Mounting Kit User 's Guide EK-350SV-UG StorageWorks Family Desktop Expansion Unit User 's Guide EK-BA353-UG StorageWorks Metric Shelf Bracket Kit Installation Guide EK-35XRD-IG StorageWorks RETMA Shelf Rail Kit Installation Guide EK-35XRB-IG StorageWorks SW500-Series Data Center Cabinet Installation and User 's Guide EK-SW500-IG StorageWorks SW800-Series Data Center Cabinet Cable Distribution Unit Installation Guide EK-SWCDU-IS StorageWorks SW800-Series Data Center Cabinet Installation and User 's Guide EK-SW800-IG ------------------------------------------------------------ Legend: +--Provided with each system +--Includes BA350-SA SBB shelf user 's guide §--Available from Digital Account Representative (continued on next page) vi Table 1 (Cont.) StorageWorks Related Documentation ------------------------------------------------------------ Document Title Order Number ------------------------------------------------------------ Alpha AXP DEC 7000 and DEC 1000 Systems ------------------------------------------------------------ BA350-LA Modular Storage Shelf User 's Guide EK-350LA-UG BA655 SCSI Disk and Tape PIU Installation Guide EK-BA655-IN ------------------------------------------------------------ Storage Devices ------------------------------------------------------------ Installation Notice--RZ73 Bus Termination and Jumper Installation Guide EK-RZ73X-IS RRD42 Disk Drive Owner 's Manual EK-RRD42-OM RZ Series Disk Drive Installation Guide EK-DRZ01-IG RZ Series Disk Drive Reference Manual EK-RZXXD-RM RZ24 Hard Disk Drive Installation Guide EK-RZ24I-IS RZ26B Disk Drive Installation Guide EK-RZ26B-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 TZ30 Cartridge Tape Drive Operator 's Manual EK-OTZ30-OM TZ30 Cartridge Tape Drive Reference Card EK-OTZ30-RC TZ30 Cartridge Tape Drive Technical Manual EK-OTZ30-TM ------------------------------------------------------------ General Reference Publications ------------------------------------------------------------ Digital Systems and Options Catalog§ Small Computer System Interface, An Overview EK-SCSIS-OV Small Computer System Interface, A Developer 's Guide EK-SCSIS-DK ------------------------------------------------------------ Legend: +--Provided with each system +--Includes BA350-SA SBB shelf user 's guide §--Available from Digital Account Representative ------------------------------------------------------------ vii ------------------------------------------------------------ Manufacturer 's Declarations The following comments are applicable to the StorageWorks product line: ------------------------------------------------------------ CAUTION ------------------------------------------------------------ This is a class A product. In a domestic environment, this product may cause radio interference, in which case the user may be required to take adequate measures. ------------------------------------------------------------ ------------------------------------------------------------ ACHTUNG ! ------------------------------------------------------------ Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses Gerätes Rundfunkstörungen auftreten, in welchen Fällen die Benutzer für entsprechende Gegenmaßnahmen verantwortlich sind. ------------------------------------------------------------ ------------------------------------------------------------ ATTENTION ! ------------------------------------------------------------ Ceci est un produit de Classe A. Dans un environment domestique, ce produit risque de créer des interférences radiélectriques, il appartiendra alors à l’utilisateur de prendre les mesures spécifiques appropriées. ------------------------------------------------------------ ix Acoustic Noise Declaration Acoustics - Preliminary Declared Values per ISO 9296 and ISO 7779 ------------------------------------------------------------ Sound Power Level L W A d , B+ ------------------------------------------------------------ Sound Pressure Level L pA m , dBA (Bystander Positions) ------------------------------------------------------------ Product+ Idle Operate Idle Operate ------------------------------------------------------------ BA350-MA Controller Shelf 5.8 5.8 41 41 ------------------------------------------------------------ Deskside Expansion Enclosure at the Side of the Desk ------------------------------------------------------------ BA350-MA Controller Shelf 5.7 5.7 40 40 ------------------------------------------------------------ Sound Power Level L W Ad , B+ ------------------------------------------------------------ Sound Pressure Level L pAm , dBA (Operator Positions) ------------------------------------------------------------ Product+ Idle Operate Idle Operate ------------------------------------------------------------ Deskside Expansion Enclosure at the Side of the Desk ------------------------------------------------------------ BA350-MA Controller Shelf 5.7 5.7 37 37 ------------------------------------------------------------ Deskside Expansion Enclosure on Top of the Desk ------------------------------------------------------------ BA350-MA Controller Shelf 5.7 5.7 48 48 ------------------------------------------------------------ + Current values for specific configurations are available from Digital Account Representatives. + 1 B = 10 dBA ------------------------------------------------------------ x Schallemissionswerte - Vorläufige Werteangaben nach ISO 9296 und ISO 7779/DIN EN27779 ------------------------------------------------------------ Schalleistungspegel L W A d , B+ ------------------------------------------------------------ Schalldruckpegel L pA m , dBA (Beistehende Position) ------------------------------------------------------------ Gerät+ Leerlauf Betrieb Leerlauf Betrieb ------------------------------------------------------------ BA350-MA Controller Shelf 5,8 5,8 41 41 ------------------------------------------------------------ Deskside Expansion Enclosure neben einem Schreibtisch ------------------------------------------------------------ BA350-MA Controller Shelf 5,7 5,7 40 40 ------------------------------------------------------------ Schalleistungspegel L W Ad , B+ ------------------------------------------------------------ Schalldruckpegel L pAm , dBA (Bediener Position) ------------------------------------------------------------ Gerät+ Leerlauf Betrieb Leerlauf Betrieb ------------------------------------------------------------ Deskside Expansion Enclosure neben einem Schreibtisch ------------------------------------------------------------ BA350-MA Controller Shelf 5,7 5,7 37 37 ------------------------------------------------------------ Deskside Expansion Enclosure auf einem Schreibtisch ------------------------------------------------------------ BA350-MA Controller Shelf 5,7 5,7 48 48 ------------------------------------------------------------ + Aktuelle Werte für spezielle Ausrüstungsstufen sind über die Digital Equipment Vertretungen erhältlich. + 1 B = 10 dBA ------------------------------------------------------------ xi Für Bundesrepublik Deutschland For Federal Republic of Germany Pour la République féderale d'Allemagne Hochfrequenzgerätezulassung und Betriebsgenehmigung Bescheinigung des Herstellers/Importeurs: Hiermit wird bescheinigt, daß die Einrichtung in Übereinstimmung mit den Bestimmungen der DBP-Verfügung 523/1969, Amtsblatt 113/1969, und Grenzwertklasse "A" der VDE0871 funkentstört ist. Das Bundesamt für Zulassungen in der Telekommunikation der Deutschen Bundespost (DBP) hat diesem Gerät eine FTZ-Serienprüfnummer zugeteilt. Betriebsgenehmigung: Hochfrequenzgeräte dürfen erst in Betrieb genommen werden, nachdem hierfür von dem für den vorgesehenen Aufstellungsort zuständigen Fernmeldeamt mit Funkstörungsmeßstelle die Genehmigung erteilt ist. Als Antrag auf Erteilung einer Genehmigung dient eine Anmeldepostkarte (Anhang des Handbuches) mit Angabe der FTZ-Serienprüfnummer. Der untere Teil der Postkarte ist vom Betreiber zu vervollständigen und an das örtliche Fernmeldeamt zu schicken. Der obere Teil bleibt beim Gerät. Betreiberhinweis: Das Gerät wurde funktechnisch sorgfältig entstört und geprüft. Die Kennzeichnung mit der Zulassungsnummer bietet Ihnen die Gewähr, daß dieses Gerät keine anderen Fernmeldeanlagen einschließlich Funkanlagen stört. Sollten bei diesen Geräten ausnahmsweise trotzdem, z.B. im ungünstigsten Fall beim Zusammenschalten mit anderen EVA-Geräten, Funkstörungen auftreten, kann das im Einzelnen zusätzliche Funkentstörungsmaßnahmen durch den Benutzer erfordern. Bei Fragen hierzu wenden Sie sich bitte an die örtlich zuständige Funkstörungsmeßstelle Ihres Fernmeldeamtes. Externe Datenkabel: Sollte ein Austausch der von Digital spezifizierten Datenkabel nötig werden, muß der Betreiber für eine einwandfreie Funkentstörung sicherstellen, daß Austauschkabel im Aufbau und Abschirmqualität dem Digital Originalkabel entsprechen. Kennzeichnung: Die Geräte werden bereits in der Fertigung mit der Zulassungsnummer gekennzeichnet und mit einer Anmeldepostkarte versehen. Sollte Kennzeichnung und Anmeldepostkarte übergangsweise nicht mit ausgeliefert werden, kontaktieren Sie bitte das nächstgelegene Digital Equipment Kundendienstbüro. xii 1 ------------------------------------------------------------ Introducing the BA350-MA StorageWorks Controller Shelf This chapter describes the BA350-MA StorageWorks controller shelf, to include the shelf layout, dimensions, the external Small Computer System Interface (SCSI) connections (ports) for StorageWorks building block shelves (SBB shelves), and the general shelf specifications. ------------------------------------------------------------ Note ------------------------------------------------------------ The procedures for installing a controller shelf, routing cables, and connecting cables are unique to each cabinet and are described in the cabinet-specific manuals. ------------------------------------------------------------ 1.1 Product Description The BA350-MA controller shelf (see Figure 1-1) is used for the HS-series of array controllers, such as the HSJ40 controller. The only StorageWorks building blocks (SBBs) that can be installed in this shelf are the power supplies. No storage SBBs can be installed in this shelf. Figure 1-1 BA350-MA StorageWorks Controller Shelf CXO-3846A-PHðTX CONTROLLER 1ðTX CONTROLLER 2 ðTX ------------------------------------------------------------ ------------------------------------------------------------ ------------------------------------------------------------ Introducing the BA350-MA StorageWorks Controller Shelf 1.1 Product Description As shown in Figure 1-2, each shelf can have the following components: · Two controllers (Controller 1 and Controller 2) · Two cache modules (one for each controller) · Two power supplies Controller 1 is assigned SCSI device-side, single-ended device address 7. Controller 2 is assigned SCSI device-side, single-ended address 6. The cache module for each controller is installed directly beneath the controller. ------------------------------------------------------------ Note ------------------------------------------------------------ There are two sets of SCSI device addresses: the host-side and the device-side. The host-side is for the host and controllers. The device-side is for the controllers and the devices. Only the device- side, single-ended, SCSI device addresses are discussed in this manual. Controller device addresses are initiator IDs; storage device addresses are target IDs. ------------------------------------------------------------ Figure 1-2 BA350-MA Controller Shelf Layout Below the Controller 2 cache module are six 50-pin, high-density, female SCSI-2 connectors for connecting SBB shelf SCSI cables. Each controller connector port (three per controller) controls two SCSI buses. The relationship of the controller connectors (ports) to the SCSI bus connectors (ports) are as follows: Controller Port ------------------------------------------------------------ SCSI Ports ------------------------------------------------------------ Port 0 Port 1 Port 2 Port 1 Port 3 Port 4 Port 2 Port 5 Port 6 1-2 Introducing the BA350-MA StorageWorks Controller Shelf Introducing the BA350-MA StorageWorks Controller Shelf 1.1 Product Description The controller shelf can be installed in either an SW500-series or the SW800-series data center cabinet 1 and oriented either horizontally or vertically. The orientation and location of each controller shelf are described in the cabinet documentation and in the HS Family of Array Controllers User 's Guide. The dimensions of this shelf, in millimeters (mm) and inches, are as follows: Dimension ------------------------------------------------------------ mm ------------------------------------------------------------ Inches ------------------------------------------------------------ Height 150 5.9 Width 445 17.5 Depth 350 13.8 The arrangement of shelf components are as follows: · The shelf ac power supply is mounted in the leftmost slot of a horizontally mounted shelf (the top slot of a vertically mounted shelf). · The redundant ac power supply is mounted in the second slot from the left (top). · The redundant power supply slot can be used for a storage SBB, provided no controller has a device initiator ID of 6. · As shown in Figure 1-3, each shelf has two replaceable blowers mounted on the rear of the shelf. Figure 1-3 Shelf Blowers BLOWER 1ðTX ------------------------------------------------------------ ------------------------------------------------------------ ------------------------------------------------------------ CXO-3847A-PHðTX ------------------------------------------------------------ BLOWER 2ðTX Introducing the BA350-MA StorageWorks Controller Shelf 1.2 BA350-MA Controller Shelf Products 1.2 BA350-MA Controller Shelf Products Table 1-1 lists the StorageWorks products that can be used with this shelf. The information in this table is general in nature 2 and is based on the following: · A BA350-MA controller shelf with HSJ40 array controller with a read cache module · The BA350-MA controller shelf is installed in an SW800-series data center cabinet. · The following factors will affect the information presented in Table 1-1: - The configuration type (optimal performance; optimal availability) - The controller configuration (non-redundant; dual-redundant) - The redundant array of independent disks (RAID) set (0, 1, 3, or 5) used Table 1-1 BA350-MA StorageWorks Controller Shelf Products ------------------------------------------------------------ StorageWorks Product Min Max Comments ------------------------------------------------------------ SCSI Bus ------------------------------------------------------------ Single-ended, device-side, SCSI buses 6 6 Standard ------------------------------------------------------------ Cooling ------------------------------------------------------------ BA35X-MA blower 2 2 Standard ------------------------------------------------------------ Array Controllers and Read Cache Module ------------------------------------------------------------ HSJ40 Controller Module with either a 16 MB or 32 MB cache module 1 2 Two controllers are required for dual-redundant operation. ------------------------------------------------------------ Power Units ------------------------------------------------------------ BA35X-HA ac power supply 1 2 Digital recommends two power supplies per controller shelf and SBB shelf. ------------------------------------------------------------ Supported Storage Shelf and Storage Device Configurations ------------------------------------------------------------ BA350-SA SBB shelves All 3½-inch SBBs All 5¼-inch SBBs 6 12 6 12 Digital recommends two power supplies per shelf. 3½-inch SBBs per SCSI bus per HSJ40 system 1 6 7 42 Digital recommends a maximum of 6 3½-inch SBBs per SCSI bus for a maximum of 36 devices per system. 5¼-inch SBB per SCSI bus per HSJ40 system 1 6 4 24 Requires three slots ------------------------------------------------------------ ------------------------------------------------------------ 2 For a detailed description of the recommended configurations, see the HS Family of Array Controllers User 's Guide. 1-4 Introducing the BA350-MA StorageWorks Controller Shelf 2 ------------------------------------------------------------ Configuration Rules This chapter describes the specific rules for configuring a BA350-MA controller shelf system, to include SBBs, power, and SCSI device addressing. These rules are used to plan a system configuration. Subsequent chapters provide detailed procedures for implementing the configuration rules. ------------------------------------------------------------ Note ------------------------------------------------------------ The configuration rules in the following sections have precedence over those listed in the StorageWorks Family Configuration Guide. ------------------------------------------------------------ 2.1 SBB Configuration Rules Use the following rules to configure the SBBs in the BA350-SA SBB shelves: · Refer to the StorageWorks Family Configuration Guide for the Digital StorageWorks storage devices available. · The following factors determine the maximum number of SBBs you can install in an SBB shelf: -- The SBB physical size (either 3½-inch or 5¼-inch) -- The bus configuration -- The controller device address 2.2 Power Configuration Rules Use the following rules to configure the power: · Each controller or SBB shelf requires an ac shelf power supply. · The shelf power supply is installed in the leftmost (top) SBB slot. · Digital recommends that all controller shelves have a shelf power supply and a redundant power supply. The redundant power supply is installed in the slot next to the shelf power supply. · Digital recommends that the SBB shelves have a redundant power supply installed. ------------------------------------------------------------ Note ------------------------------------------------------------ No SBB shelf can have a redundant power supply when the system is configured for seven storage devices in a shelf. ------------------------------------------------------------ Configuration Rules 2-1 Configuration Rules 2.3 SCSI Device Addressing Rules 2.3 SCSI Device Addressing Rules Use the following rules to assign device addresses to the controllers and SBBs (disk drives, tape drives, and so forth) in a system with an BA350-MA controller shelf: · The maximum number of device addresses per SCSI bus is eight (0 through 7). · The maximum number of device addresses per SBB shelf is seven (0 through 6). · The controllers in the BA350-MA controller shelf are automatically assigned a device address based upon their physical location, as shown in Figure 2-1. Figure 2-1 BA350 MA Controller Shelf Device Addresses CXO-3870A-PHðTX DEVICE ADDRESS 7ðTX DEVICE ADDRESS 6ðTX ------------------------------------------------------------ ------------------------------------------------------------ ------------------------------------------------------------ 3 ------------------------------------------------------------ SCSI Bus Configurations This chapter describes the BA350-MA StorageWorks controller shelf SCSI buses with HSJ40 array controllers installed. ------------------------------------------------------------ Note ------------------------------------------------------------ SCSI bus configurations are controller-specific. The SCSI bus configurations described in this chapter apply only to the HSJ40 controller. ------------------------------------------------------------ See the HS Family of Array Controllers User 's Guide for detailed information about the HSJ40 controller. 3.1 SCSI Bus Description The BA350-MA controller shelf has six, single-ended, SCSI-2 buses. The 50-pin, high-density, female connectors for these buses are located at the bottom of a horizontally mounted shelf (the left side of vertically mounted shelf). These buses are numbered 1 through 6 starting at the left (top). Each SCSI bus can have a maximum of eight devices connected to it, including the controller. Valid configurations include the following: Controller Shelf ------------------------------------------------------------ SBB Shelf ------------------------------------------------------------ Configuration ------------------------------------------------------------ Controllers ------------------------------------------------------------ Power SBBs ------------------------------------------------------------ Devices ------------------------------------------------------------ Power SBBs ------------------------------------------------------------ Non-Redundant 1 2 7 1 Dual-Redundant 2 2 6 2 In a non-redundant configuration, the controller (Controller 1) is mounted in the top (righthand) location. In a dual-redundant configuration the second controller (Controller 2) is mounted in the third slot from the top (right). ------------------------------------------------------------ CAUTION ------------------------------------------------------------ When Controller 2 is installed in the third slot of the BA350-MA controller shelf, · No 3½-inch disk SBB can be installed in slot 6 of any SBB shelf · No 3½-inch tape drive SBB or any 5¼-inch SBB device address switch can be set to device address 6 or the SCSI bus will malfunction. ------------------------------------------------------------ SCSI Bus Configurations 3-1 SCSI Bus Configurations 3.1 SCSI Bus Description These buses can transfer data at either 5 MB/s (Megabytes per second) or 10 MB/s. The rate at which data is transferred is affected by many things. However, the two primary concerns are as follows: · The maximum rate at which the controller or initiator can transmit data · The maximum rate at which the target device can process data The total length of a SCSI bus is measured from the terminator on the controller to the terminator on the SBB shelf. The maximum length of these buses, including all cables and shelf buses, is shown in Table 3-1: Table 3-1 Single-Ended, SCSI-2 Bus Parameters ------------------------------------------------------------ Bus Type Transfer Rate Meters Feet ------------------------------------------------------------ 8-bit, single-ended 5 MB/s 6 19.7 8-bit, single-ended 10 MB/s 3 9.8 ------------------------------------------------------------ 3.2 Calculating the SCSI Bus Length for a Single SBB Shelf The SCSI bus for a single shelf is composed of the following segments: · Segment A--The distance from the controller terminator to the shelf backplane connector (port) and from there to the SCSI bus connector · Segment B--The length of the BN21H-series cable from the controller shelf to the SBB shelf (either 1 meter [3.3 feet] or 2 meters [6.5 feet]) · Segment C--For a single SBB shelf this is the distance from the SBB shelf input connector to the shelf SCSI terminator. Use the information in Table 3-2 and the following formula to calculate the length of a SCSI bus: T o t a l B u s L e n gt h = A + B + C 3.3 Calculating the SCSI Bus Length for Multiple SBB Shelves The SCSI bus for multiple SBB shelves on a single SCSI bus is composed of the following segments: · Segment A--The distance from the controller terminator to the shelf backplane connector (port) and from there to the SCSI bus connector · Segment B--The length of the BN21H-series cable from the controller shelf to the SBB shelf (either 1 meter [3.3 feet] or 2 meters [6.5 feet]) · Segment D--The distance from the first SBB shelf input connector to the shelf output connector · Segment E--The length of the BN21H-series cable (0.5 meters or 1.6 feet) that connects the first shelf to the second shelf · Segment F--The distance from the input connector on the second shelf to the bus terminator on the same shelf. 3-2 SCSI Bus Configurations SCSI Bus Configurations 3.3 Calculating the SCSI Bus Length for Multiple SBB Shelves Use the information in Table 3-2 and the following formula to calculate the length of a SCSI bus: T o t a l B u s L e n gt h = A + B + D + E + F Table 3-2 BA350-MA Controller Shelf System SCSI Bus Segments ------------------------------------------------------------ Length ------------------------------------------------------------ Segment From To Meters Inches Feet ------------------------------------------------------------ BA350-MA Controller Shelf ------------------------------------------------------------ A Controller terminator SCSI port 0.25 10.3 0.9 ------------------------------------------------------------ Controller Shelf to First SBB Shelf ------------------------------------------------------------ B+ Controller shelf output connector SBB shelf input connector 1.0 2.0 39.4 78.8 3.3 6.6 ------------------------------------------------------------ Single SBB Shelf ------------------------------------------------------------ C 3 device input connector 4 device input connector 7 device input connector Terminator in slot 5 Terminator in slot 5 Terminator in slot 1 0.4 0.6 0.9 16.4 23.6 34.7 1.4 2.0 2.9 ------------------------------------------------------------ Multiple SBB Shelves ------------------------------------------------------------ D 7 device input connector Output connector 0.9 35.7 3.0 E+ Shelf 1 output connector Shelf 2 input connector 0.5 19.7 1.6 F 3 device input connector 4 device input connector 7 device input connector Terminator in slot 5 Terminator in slot 5 Terminator in slot 1 0.4 0.6 0.9 16.4 23.6 34.7 1.4 2.0 2.9 ------------------------------------------------------------ + BN21H-series cable ------------------------------------------------------------ SCSI Bus Configurations 3-3 SCSI Bus Configurations 3.4 Configuring SCSI Buses 3.4 Configuring SCSI Buses The flexibility of the StorageWorks product family permits the installation of both 3½-inch and 5¼-inch SBBs in the same shelf. This, plus the capabilities of using either one or two controllers or having two separate buses on one SBB shelf, provides for many unique, solution-oriented configurations. Rather than describing all the possible configurations, the material in this section describes the basic configurations, each using either all 3½-inch SBBs or all 5¼-inch SBBs. From the information presented in Table 3-2 and the following sections, you can develop configurations that meet specific system needs. To quickly identify the number of SCSI buses and the maximum number of devices on each bus, the StorageWorks documentation identifies the bus with a three-character identifier with that has the format bxd, where: b is the number of SCSI buses d is the maximum number of devices per bus The following example defines some of the typical identifiers: Bus ------------------------------------------------------------ Definition ------------------------------------------------------------ 6x1 A six SCSI bus system with one device per bus, for a total of six devices. 5x3 A five SCSI bus system with three devices per bus, for a total of 15 devices. 3-4 SCSI Bus Configurations SCSI Bus Configurations 3.4 Configuring SCSI Buses 3.4.1 3½-Inch SBB SCSI Bus Configurations The 3½-inch SBB SCSI bus configurations listed in this section were developed based on the following premises: · Digital recommends using 6x1 through 6x6 SCSI buses with the following components: - Two HSJ40 controllers, a dual-redundant controller configuration - Two ac power supplies in the controller shelf - Two ac power supplies in each SBB shelf · An alternate configuration is a 6x7, non-redundant controller configuration that includes the following: - A single HSJ40 control installed in the top (righthand) controller shelf location - Two ac power supplies in each SBB shelf - One ac power supply in the controller shelf · When the second controller is installed, no SBB can use device address 6. · Only three BA350-SA SBB shelves are required for 6x1, 6x2, and 6x3 3½-inch SBBs bus configurations. · Six BA350-SA SBB shelves are required for 6x4, 6x5, 6x6, and 6x7 3½-inch SBB bus configurations · The device address switches on the rear of the 3½-inch tape drive SBBs must be set as described in the StorageWorks Family User 's Guide to ensure that there are no duplicate addresses on the bus. SCSI Bus Configurations 3-5 SCSI Bus Configurations 3.4 Configuring SCSI Buses 3.4.2 6x1 to 6x3 3½-Inch Bus Configurations The 6x1 through 6x3 bus configurations require only three SBB shelves. However, adding more devices requires purchasing additional shelves and either reconstructing all the RAID sets or following an involved and time-consuming upgrade process. A six shelf system can be upgraded simply by adding devices to each bus with minimal impact on system operations. Figure 3-1 shows the cabling and location of the terminators and jumpers on each shelf. These configurations are unique in that they use both SBB shelf SCSI-2 connectors (JA1 and JB1) as input connectors. This results in the following configuration: · SCSI connector JA1 connects the controller to device addresses 0, 2, and 4. · SCSI connector JB1 connects the controller to device addresses 1, 3, and 5. · Digital recommends that a redundant power supply be installed in slot 6. · Device address 6 cannot be used in a dual-rendundant controller configuration. · The terminator board in slot 5 actively terminates both SCSI buses. · The jumper board installed in slot 1 has no function in this configuration. ------------------------------------------------------------ Note ------------------------------------------------------------ SCSI connector JB1 can only be used as an input connector when a shelf SCSI bus terminator is installed in slot 5. ------------------------------------------------------------ 3-6 SCSI Bus Configurations SCSI Bus Configurations 3.4 Configuring SCSI Buses Figure 3-1 6x1 to 6x3 3½-Inch Buses SCSI Bus Configurations 3-7 SCSI Bus Configurations 3.4 Configuring SCSI Buses 3.4.3 6x1 to 6x7 3½-Inch Bus Configurations The 6x4 through 6x7 configurations require six SBB shelves. Digital recommends that six shelves also be used for the 6x1 through 6x3 configurations because this will significantly reduce the time required to expand the system. Figure 3-2 shows the cabling and location of the terminators and jumpers on each shelf for the 6x1 through 6x7 configurations. All of these configurations use SCSI-2 connector JA1 as an input connector. This results in the following configuration: · The jumper board in slot 5 connects the two SBB shelf buses into a single bus. · SCSI connector JA1 connects the controller to all seven SBB slots (device addresses 0 through 6). · Digital recommends that a redundant power supply be installed in slot 6. · Device address 6 cannot be used in a dual-rendundant controller configuration. · The terminator board in slot 1 actively terminates the SCSI bus. 3-8 SCSI Bus Configurations SCSI Bus Configurations 3.4 Configuring SCSI Buses Figure 3-2 6x4 to 6x7 3½-Inch Buses SCSI Bus Configurations 3-9 SCSI Bus Configurations 3.4 Configuring SCSI Buses 3.4.4 5¼-Inch Bus Configurations The 6x1 and 6x2 configurations can be installed in six SBB shelves. Expansion to either a 6x3 or a 6x4 5¼-inch bus requires 12 SBB shelves. For systems with only 5¼-inch devices, Digital recommends that 12 shelves also be installed for the 6x1 and 6x2 configurations to permit expansion. This section describes configurations using 12 shelves. Figure 3-3 shows the cabling and location of the terminators and jumpers on each shelf for the 6x1 through 6x4 configurations. All of these configurations use SCSI-2 connector JA1 as an input connector. This results in the following configuration: · The first (top) shelf in each pair does not have a terminator installed. · The jumper board in slot 5 of the first shelf connects the two SBB shelf buses into a single bus and routes them to SCSI connector JB1, the output connector. · The output connector of the first shelf is connected to the JA1, the input connector on the second shelf. · SCSI connector JA1 on the second shelf connects the controller to all seven SBB slots (device addresses 0 through 6). ------------------------------------------------------------ Note ------------------------------------------------------------ Connector JB1 can only be used as an output connector on a shelf that has a SCSI bus jumper board installed in slot 5 and no terminator board installed. ------------------------------------------------------------ 3-10 SCSI Bus Configurations SCSI Bus Configurations 3.4 Configuring SCSI Buses Figure 3-3 6x1 to 6x4 5¼-Inch Buses SCSI Bus Configurations 3-11 4 ------------------------------------------------------------ Replacement Procedures This chapter describes the detailed procedures for replacing a power supply or a blower, and the general procedures for replacing a BA350-MA controller shelf. ------------------------------------------------------------ Note ------------------------------------------------------------ Detailed procedures for replacing controllers are described in the HS Family of Array Controllers User 's Guide. Detailed procedures for replacing storage SBBs are described in the StorageWorks Family User 's Guide. ------------------------------------------------------------ Replacement Procedures 4-1 Replacement Procedures 4.1 Replacing a Power Supply 4.1 Replacing a Power Supply There are two methods for replacing a power supply: the hot-swap method and the cold-swap method. · Use the hot-swap method to replace power supplies only when there are two power supplies in a shelf. This method allows you to remove the defective power supply while the other supply furnishes the power. ------------------------------------------------------------ Note ------------------------------------------------------------ A hot-swap is a method of power supply removal that does not disable the controller shelf or the associated SCSI buses. ------------------------------------------------------------ · The cold-swap method is normally used during initial installation or when there is no operational shelf power supply. Should this occur, the controller shelf, the controller, the cache module, and all associated SCSI buses are disabled. None of the devices is operational until the power is restored. ------------------------------------------------------------ Note ------------------------------------------------------------ The procedures for removing power supplies and SBBs are basically the same. ------------------------------------------------------------ Use the following procedure to remove or replace a power unit. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ The power supply is relatively heavy and can be damaged if dropped. Therefore, always use both hands to fully support the power supply during removal or installation. ------------------------------------------------------------ 1. As shown in Figure 4-1, press the two mounting tabs together to release the power supply from the shelf. 2. Use both hands and pull the power supply out of the shelf. 3. Insert the replacement power supply into the guide slots and push it in until it is fully seated and the mounting tabs engage the shelf. 4. After input power is applied, observe the power supply status LEDs to make sure the power supply is functioning properly. Both status LEDs should be on. 4-2 Replacement Procedures Replacement Procedures 4.1 Replacing a Power Supply Figure 4-1 Removing a Power Supply ------------------------------------------------------------ CXO-3611B-PHðTX Replacement Procedures 4.2 Replacing a Blower 4.2 Replacing a Blower The BA350-MA StorageWorks controller shelf has blowers mounted on the rear. Connectors on the backplane provide the +12 Vdc power to operate the blowers. When either blower fails, the shelf status (upper) LED on the power SBB is off and an error message is passed to the controller or host. ------------------------------------------------------------ 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 supplies before removing shelf blower assemblies or performing service in the backplane area, such as modifying the SCSI bus. ------------------------------------------------------------ Use the following procedure to replace a blower (see Figure 4-2). 1. If you cannot access the rear of the shelf, remove the shelf as described in Section 4.3.1. 2. Disconnect the power cables to the shelf power SBBs. 3. Use a Phillips screwdriver to remove the safety screw in the upper right corner or lower left corner of the blower. 4. Press the upper and lower blower mounting tabs together to release the blower. 5. Pull the blower straight out to disconnect it from the shelf power connector. 6. Align the replacement blower connector and push the blower straight in, making sure that both mounting tabs lock in place. 7. Replace the safety screw. 8. Replace the shelf as described in Section 4.3.2. 9. Connect the shelf power cables and verify that the shelf and all SBBs are operating properly. ------------------------------------------------------------ Note ------------------------------------------------------------ If the upper power supply LED (shelf status) does not come on and all the shelf power supplies are operating, the second blower may have failed or the wrong blower was replaced. ------------------------------------------------------------ 4-4 Replacement Procedures Replacement Procedures 4.2 Replacing a Blower Figure 4-2 Replacing Blowers ------------------------------------------------------------ ------------------------------------------------------------ GUIDEðTX CONNECTORðTX PHILLIPSðTx SCREWðTX MOUNTINGðTx TABðTX BLOWERðTX ------------------------------------------------------------ ------------------------------------------------------------ ------------------------------------------------------------ ------------------------------------------------------------ CXO-3659A-PHðTX ------------------------------------------------------------ ------------------------------------------------------------ Replacement Procedures 4.3 Replacing a StorageWorks Shelf 4.3 Replacing a StorageWorks Shelf The procedures for removing or replacing any StorageWorks shelf are basically the same. The major differences are the type of enclosure or cabinet in which the shelf is mounted and the shelf orientation. Usually the only time you would remove a shelf is to replace a blower. Installing an additional shelf is not within the scope of this publication. Detailed instructions for mounting a shelf in a cabinet are contained in the cabinet installation guide listed in the Related Documents section of the preface. 4.3.1 Removing a Shelf All shelves are inserted into a set of mounting brackets and secured in place with a front locking bracket. Complete the following procedure to remove a shelf: 1. Turn off the power to the shelf and disconnect the power cords. 2. Record the location of each storage device, controller, and cache module in the shelf. 3. Record the location of each controller interface cable. 4. Remove devices for access to the SCSI cable connectors. 5. Record the location of each SCSI cable. 6. Remove both the front locking brackets. ------------------------------------------------------------ CAUTION ------------------------------------------------------------ Be sure to fully support the weight of the shelf with both hands at all times. Removing all the SBBs will significantly reduce the shelf weight. ------------------------------------------------------------ 7. Note the shelf orientation and carefully slide it out of the mounting brackets. 4.3.2 Installing a Shelf Complete the following procedure to replace a shelf: 1. Orient the shelf and carefully slide it into the mounting brackets. 2. When it is fully seated, install the front locking brackets. 3. Connect each SCSI cable to the same connector from which it was removed. 4. Install each SBB, controller, and cache module in the same location from which it was removed. 5. Connect each controller interface cable to the same connector from which it was removed. 6. Insert the power SBB and connect the power cord. 7. Turn on power to the shelf and ensure that the shelf, the power supplies, and all devices are functioning properly. 8. If you replaced a shelf blower, ensure that both blowers are functioning. 4-6 Replacement Procedures ------------------------------------------------------------ Glossary ac distribution The method of distributing ac power in a cabinet. adapter See SCSI signal bus converter. ANSI American National Standards Institute array controller See controller. building block shelf See SBB. channel Another term for a SCSI bus. CI Computer interface. The computer interconnect bus with two serial paths, each with a transfer rate of 70 Mb/s (8.75 MB/s). cold-swap A method of device replacement that requires that power be removed from one or more shelves in a cabinet, thereby affecting other devices therein. User applications that are not dependent upon the devices being swapped are impacted as a result. This method is used when conditions preclude the use of a warm-swap or hot-swap method. Normally, this method is only used when installing or upgrading a StorageWorks subsystem. See also warm-swap and hot-swap. controller A hardware/firmware device that manages communications on behalf of host systems over the SCSI bus to devices, such as the HSC-series, HSJ-series, and HSZ-series controllers. Controllers typically differ by the type of interface to the host and provide functions beyond what the devices support. controller shelf Any StorageWorks shelf that contains only controllers and cache memories, for example, a BA350-MA shelf. Glossary-1 data center cabinet A generic reference to the large cabinets, such as the SW800 series, in which SBB shelves, controller shelves, or controller and SBB shelves can be mounted. differential SCSI bus A signal's level is determined by the potential difference between two wires. A differential bus is more robust and less subject to electrical noise than is a single-ended bus. disk A storage device supporting random access to fixed size blocks of data. disk array controller See controller. electromagnetic interference See EMI. electrostatic discharge See ESD. EMI Electromagnetic interference. The impairment of a signal by an electromagnetic disturbance. ESD Electrostatic discharge. The discharge of a potentially harmful static electric voltage as a result of improper grounding. full-height (1) In the storage industry, a device of conventional dimensions. (2) A single device mounted in an 5¼-inch SBB. Full-height devices have an order number suffix of "VA." FWD SCSI The fast, wide, differential SCSI bus with a 16-bit data transfer rate of up to 20 MB/s. See also FD SCSI and SCSI. host The primary or controlling computer or any such (in a multiple computer network) to which storage is attached. hot-swap A method of device replacement whereby the complete system remains on line and active during device removal or insertion. The device being removed or inserted is the only device that cannot perform operations during this process. User applications that are not dependent upon the device being swapped are not impacted. See also cold-swap and warm-swap. Glossary-2 initiator A SCSI device (usually a host system) that requests an operation to be performed by another SCSI device (a target). port A logical route for data in and out of a controller. A port, in use, can contain one or more channels, all of which contain the same type data. RAID Redundant Array of Independent Disks SBB StorageWorks building block. The basic building block of the StorageWorks product line. Any device conforming to shelf mechanical and electrical standards installed in either a 3½-inch or 5¼-inch carrier is considered to be an SBB, whether it be a storage device, a power supply, a CPU, or other device. SBB shelf The common name for any StorageWorks shelf that contains only power supply and storage SBBs. SCSI Small Computer System Interface. This ANSI interface defines the physical and electrical parameters of a parallel I/O bus used to connect computers and a maximum of seven devices. The StorageWorks subsystem implementation uses SCSI-2, for the synchronous transfer of 8-bit data at rates of up to 10 MB/s. SCSI device A host computer adapter, a peripheral controller, or an intelligent peripheral that can be attached to the SCSI bus. SCSI device ID The bit-significant representation of the SCSI addressing referring to one of the signal lines numbered 0 through 7. Also referred to as target ID. SCSI device-side device address The eight device addresses (target IDs) assigned to the SCSI controller and the devices it controls. See also SCSI host-side device address. SCSI host-side device address The eight device addresses (target IDs) assigned to the host device and the SCSI controllers and the devices it controls. See also SCSI device-side device address. SCSI port Software: The channel that controls communications to and from a specific SCSI bus in the system. Hardware: The name of the logical socket at the back of the system unit to which a SCSI device is connected. Glossary-3 SCSI-A cable A 50-conductor (25 twisted pair) cable used for single-ended, SCSI-2 bus connections. SCSI-P cable A 68-conductor (34 twisted pairs) cable used for differential bus connections. single-ended SCSI bus Each signal's logic level is determined by the voltage of a single wire in relation to ground. Small Computer System Interface See SCSI. StorageWorks The Digital set of enclosure products that allows customers to design and configure their own storage subsystem. Components include power, packaging, and interconnections in a StorageWorks shelf. SBBs and array controllers are integrated therein to form storage subsystems. System-level enclosures to house the shelves and standard mounting devices for SBBs are also included. StorageWorks building block See SBB. tape A storage device supporting sequential access to variable sized data records. tape controller See controller. target A SCSI device that performs an operation requested by an initiator. target ID See SCSI device ID. warm-swap A method of device replacement whereby the complete system remains on line during device removal or insertion. Activity may be suspended or paused for a brief period of time during device insertion or removal. No booting or loading of code is permitted except on the device being inserted. User applications that are not dependent upon the devices on the affected SCSI bus are not noticeably impacted. See also cold-swap and hot-swap. Glossary-4 ------------------------------------------------------------ Index B ------------------------------------------------------------ Blowers location, 1-3 replacing, 4-4 C ------------------------------------------------------------ Configuration controller dual-redundant, 1-4 non-redundant, 1-4 dual redundant controllers, 3-1 non-redundant controller, 3-1 recommended, 1-4 rules, 2-1 device addressing, 2-2 power, 2-1 type optimal availability, 1-4 optimal performance, 1-4 D ------------------------------------------------------------ Data center cabinets, 1-3 Device address, 1-2 device-side, 1-2 P ------------------------------------------------------------ Power supply, 1-3 configuration rules, 2-1 redundant, 1-3 shelf, 1-3 R ------------------------------------------------------------ RAID, 1-4 Replacement shelf, 4-6 Replacing blowers, 4-4 power supplies, 4-2 shelves installing, 4-6 removing, 4-6 Replacing power SBBs cold-swap method, 4-2 hot-swap method, 4-2 S ------------------------------------------------------------ SCSI bus configurations, 3-1, 3-4 3½-inch SBB, 3-4, 3-5 6x1 through 6x3, 3-6 6x1 through 6x7, 3-8 bus identification, 3-4 length, 3-2 multiple SBB shelves, 3-2 single SBB shelf, 3-2 ports, 1-2 Shelf dimensions, 1-3 installation, 1-3 orientation, 1-3 replacement, 4-6 StorageWorks products, 1-4 T ------------------------------------------------------------ Transfer rates, 3-2 Index-1