Dell OptiPlex GX1 Guide d'installation télécharger pdf (Page 86)

Installing Drives: Dell OptiPlex GX1 Low-Profile Managed PC Systems

file:///C|/infodev/2013/eDoc/OpGX1/SQRG/drives.htm[2/21/2013 11:53:04 AM]

Installing SCSI Devices

To use SCSI devices in your Dell computer, you must have a SCSI host adapter card, which comes with its

own SCSI cable. This cable can be used to attach a variety of SCSI devices (hard-disk drives, tape drives,

and so on). The SCSI host adapter configures the devices attached to it as one subsystem—not as

independent devices.

Although SCSI devices are installed essentially the same way as other devices, their configuration

requirements are different.

SCSI Configuration Guidelines

For details on configuring your SCSI subsystem, refer to the documentation that came with your SCSI

devices and/or your host adapter card. The following subsections offer some general guidelines.

SCSI ID Numbers

Each device attached to a SCSI host adapter card, as well as the card itself, must have a unique SCSI ID

number from 0 to 7. When SCSI devices are shipped from Dell, the default SCSI ID numbers are assigned

as follows:

A SCSI host adapter card is configured as SCSI ID 7 (typically the default ID for a host adapter card).

A SCSI tape drive or digital audio tape (DAT) drive is configured as SCSI ID 6 (typically the default ID

number for a tape drive).

A SCSI CD-ROM drive is configured as SCSI ID 5.

SCSI hard-disk drives are usually configured as SCSI ID 0. (The drive used to boot your system should

always be configured as SCSI ID 0.)

NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that devices be

attached to the cable in order by ID number.

SCSI Cable and SCSI Termination

The type of cabling you receive with your SCSI device depends on the type of device you are installing.

If you are installing internal SCSI devices (such as CD-ROM, hard-disk, or tape drives), you have

internal SCSI cables as shown in

Figure 14. Narrow SCSI devices use a 50-pin cable; wide SCSI

devices use a 68-pin SCSI cable. One end of each cable attaches to the SCSI host adapter. The

connectors on the other end of the cable attach to the internal SCSI devices.

If you are installing an external SCSI device, you have a shielded external cable that connects to the

external SCSI connector on the SCSI host adapter card. You have a separate power cable to connect

the SCSI device to an AC power source.

Before installing SCSI devices in your computer, you may need to configure the termination on your SCSI

device(s). Both types of internal SCSI cables contain terminators on the device end of the cables, so the

devices connected to these cables must have termination disabled (see Figure 14). External SCSI cables do

not have terminators, so termination must be enabled on the SCSI device itself.

Figure 14. Internal SCSI Cables

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Dell OptiPlex GX1 Guide d'installation Page 86