Seagate ST31230N/ND Guía de instalación descargar pdf (Pagina 49)

Installing the disk drives and the tape drive 6-3

Assembling and installing the disk drives

Standard 1.0 Option 11 EC Installation and Maintenance Guide November 1999

Assembling and installing the disk drives

Introduction

Your EC 11 system comes with one disk drive for each

unshadowed node and two disk drives for each shadowed

node. Each drive is mounted on an individual drive plate that

has locklatches and that also holds the connector to the

backplane. Each pair of drive plates is mounted on a Mass

Storage Unit (MSU) plate, the size of a printed circuit pack.

The MSU plate has no electrical connectors and is only there

to support the drives mounted on their individual drive plates.

One MSU plate is permanently bolted into slot 10 to support

the primary drives. Another MSU plate is permanently bolted

into slot 12 to support the shadowed drives. A disk cover

plate attaches to the drive plate to cover each individual drive.

Disk positions

The left MSU plate supports the prime disk for node 1 (in the

lower position) and the prime disk for node 2 (in the upper

position). The right MSU plate supports the shadowed disk

for node 1 (in the lower position) and the shadowed disk for

node 2 (in the upper position). The drive plates in the

(shadowed) position on the right each contain an auxiliary

power pack. A two-node shadowed EC 11 system has four

disk drives. A two-node unshadowed system uses two disk

drives in the left position. A single-node shadowed system

uses one disk drive in the lower position of each MSU plate.

Supported disk drives

The Seagate ST31230N, Seagate ST51080N, and Seagate

ST32151N disk drives are the only supported disk drives for

the EC 11.

SCSI addresses

The SCSI address of the prime disk drive of a shadowed or

unshadowed node is 0. The SCSI address of the shadowed

disk drive of a shadowed node is 2. (The SCSI address of the

external tape drive is 1.)

Quick check

• Ensure that the SCSI ID on each primary drive (without

a power pack) is 0.

• Ensure that the SCSI ID on each shadowed drive (with a

power pack) is 2.

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Seagate ST31230N/ND Guía de instalación Pagina 49