Compaq AP200 Reference Guide - Page 86

Installing Optional SCSI Devices, Important Guidelines for Installing, Optional SCSI Devices

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4-22 Hardware Upgrades Installing Optional SCSI Devices Select models of the Compaq Professional Workstation AP200 have an internal SCSI hard drive preinstalled. You can install additional highperformance SCSI devices using the external SCSI connector located on the rear panel of the workstation. Important Guidelines for Installing Optional SCSI Devices If you are installing additional SCSI devices, you MUST adhere to the following guidelines: s To preserve data integrity, do not install more than 7 SCSI devices per SCSI controller. s The integrated Wide-Ultra SCSI controller requires that a unique SCSI ID (0-7) be set for each SCSI device installed. The controller identifies a SCSI device by its SCSI ID number rather than its location. Moving a SCSI device from one position to another 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: t SCSI ID 0 is reserved for the primary hard drive. t SCSI ID 7 is reserved for the controller. t 1 through 6 are available. s Every SCSI chain or circuit must be terminated (closed) at both ends. Termination can be accomplished by using the terminating feature on the device or by using a terminated cable. s SCSI devices may not have terminating jumpers on the device. Termination on these devices must be achieved with a terminated cable.

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4-22
Hardware Upgrades
Installing Optional SCSI Devices
Select models of the Compaq Professional Workstation AP200 have an
internal SCSI hard drive preinstalled. You can install additional high-
performance SCSI devices using the external SCSI connector located on the
rear panel of the workstation.
Important Guidelines for Installing
Optional SCSI Devices
If you are installing additional SCSI devices, you
MUST
adhere to the
following guidelines:
■
To preserve data integrity, do not install more than 7 SCSI devices per
SCSI controller.
■
The integrated Wide-Ultra SCSI controller requires that a unique SCSI
ID (0-7) be set for each SCSI device installed.
The controller identifies
a SCSI device by its SCSI ID number rather than its location. Moving a
SCSI device from one position to another 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.
SCSI ID 7 is reserved for the controller.
1 through 6 are available.
■
Every SCSI chain or circuit must be terminated (closed) at both ends.
Termination can be accomplished by using the terminating feature on
the device or by using a terminated cable.
■
SCSI devices may not have terminating jumpers on the device.
Termination on these devices must be achieved with a terminated
cable.