Seagate ST31230N/ND Guia de Instalação descarregar pdf (Página 253)

Common disk subsystem problems 17-3

Performing quick checks

Standard 1.0 Option 11 EC Installation and Maintenance Guide November 1999

Performing quick checks

Check for common

problems

When disk subsystem problems are suspected, perform a

quick check of the following:

• device jumpers

• bus termination

•power

• SCSI device sanity test

Device jumpers

Use jumpers to set the SCSI ID as well as a number of

options on the disk and tape drives. Check the settings on

these devices against the standard described in Chapter 6,

“Installing the disk drives and the tape drive.”

Bus termination

The external tape drive should not have a terminating resistor

on the unused SCSI connector on the back of the drive box, as

it has an internal terminating resistor pack. If the external

tape drive is disconnected, install SCSI terminator A0376979

into the SCSI connector on the I/O panel of the EC 11.

Power

Disk drives and tape drives are fed by the power supply. They

may behave erratically when there are problems with the

power supply. Ensure that the power to these devices is stable

if problems persist after the devices are removed and

replaced.

SCSI devices get their power as shown in this table.

This device

is powered from this

location

primary disk drives in a

shadowed system

all disk drives in an

unshadowed system

EC 11 power supply unit

secondary disk drives in a

shadowed system

auxiliary power supply on the

disk drive plate

external tape drive external power supply in the

tape drive case

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Seagate ST31230N/ND Guia de Instalação Página 253

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