Seagate ST3390N Guía de instalación descargar pdf (Pagina 378)

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19-2 Common disk subsystem problems

Overview

Standard 1.0 Modular Option EC Installation and Maintenance Guide November 1999

Overview

Introduction

When disk subsystem problems are suspected, check the

following:

• device jumpers

• bus termination

•power

• SCSI device sanity test

• relevant SEER messages, especially Maintenance Actions,

and SEERs of classes 11 to 14, 31, and 66

Device jumpers

Jumpers are used to set the SCSI ID, as well as other options on

the disk and tape drives. The actual settings on these devices

should be checked against the figures and descriptions in

Chapter 7.

Bus termination

Termination resistors are not allowed on any SCSI device.

Power

Disk and tape drives are fed by one or more DC power

converters. The drives may behave erratically when there are

problems with the power supply. Verify that the relevant power

supplies are properly installed and that the LEDs on their front

panels remain solidly lit. Refer to Chapter 6, “Installing power

supplies.”

SCSI bus sanity tests

Perform a quick sanity check of the SCSI bus by testing tape

and disk drives as follows:

Tape drive sanity test

To conduct a sanity test on a tape drive, follow these steps.

Step Action

1 Put a tape in the tape drive.

2 Power on the left side of the module.

The tape drive should make a series of clicking noises as it tries

to load the tape.

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Seagate ST3390N Guía de instalación Pagina 378

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