Compaq AP500 Reference Guide - Page 82

SCSI Guidelines for Installing, SCSI Devices, Wide-Ultra SCSI controller.

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8-12 Drives SCSI Guidelines for Installing SCSI Devices s If you are installing a narrow SCSI device, you will need to attach a 68- to 50-pin SCSI adapter to the narrow SCSI device. s A maximum of seven SCSI devices may be installed on the integrated Wide-Ultra SCSI controller. s A unique SCSI ID (0-6 and 8-15) must be set for each SCSI device installed. s Before you install a SCSI device, verify the SCSI ID of the drive and, if necessary, set the SCSI ID to a unique ID number. s The controller identifies a SCSI device by its SCSI ID (SCSI ID 1) number rather than its bay location (bay 2). Therefore, moving a SCSI device from one bay location to another or changing the position of the device on the SCSI chain does not affect the communication between the controller and the SCSI device. s The reserved and available SCSI ID numbers for SCSI devices are as follows: t SCSI ID 0 is reserved for the primary hard drive (bootable drive). t SCSI ID 7 is reserved for the controller. t SCSI IDs 1-6 and 8-15 are available. 8-15 should not be used with narrow devices on the same SCSI bus. s Bay 4 is reserved for the CD-ROM drive. Do not install a SCSI device in this bay. s If only one SCSI hard drive is used, it should be installed on the lowest numbered bay (bay 1). s Every SCSI chain must be terminated (closed) at both ends. s SCSI devices may not have terminating jumpers on the device. Determine if the device ought to have termination enabled or disabled. Set the termination if necessary. Termination on these devices must be achieved with a terminated cable. s Turn on an external SCSI device before turning on power to the workstation. This enables the system board controller to recognize the external SCSI device.

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8-12
Drives
SCSI Guidelines for Installing
SCSI Devices
■
If you are installing a narrow SCSI device, you will need to attach a
68- to 50-pin SCSI adapter to the narrow SCSI device.
■
A maximum of seven SCSI devices may be installed on the integrated
Wide-Ultra SCSI controller.
■
A unique SCSI ID (0-6 and 8-15) must be set for each SCSI device
installed.
■
Before you install a SCSI device, verify the SCSI ID of the drive and,
if necessary, set the SCSI ID to a unique ID number.
■
The controller identifies a SCSI device by its SCSI ID (SCSI ID 1)
number rather than its bay location (bay 2). Therefore, moving a SCSI
device from one bay location to another or changing the position of the
device on the SCSI chain does not affect the communication between
the controller and the SCSI device.
■
The reserved and available SCSI ID numbers for SCSI devices are as
follows:
SCSI ID 0 is reserved for the primary hard drive (bootable drive).
SCSI ID 7 is reserved for the controller.
SCSI IDs 1-6 and 8-15 are available. 8-15 should not be used with
narrow devices on the same SCSI bus.
■
Bay 4 is reserved for the CD-ROM drive. Do not install a SCSI device
in this bay.
■
If only one SCSI hard drive is used, it should be installed on the lowest
numbered bay (bay 1).
■
Every SCSI chain must be terminated (closed) at both ends.
■
SCSI devices may not have terminating jumpers on the device.
Determine if the device ought to have termination enabled or disabled.
Set the termination if necessary. Termination on these devices must be
achieved with a terminated cable.
■
Turn on an external SCSI device before turning on power to the
workstation. This enables the system board controller to recognize the
external SCSI device.