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Compaq Professional Workstation 5100 Reference Guide
Writer: Erica T Blakeney Project: Compaq Professional Workstation 5100 Reference Guide Comments: 299348-003
File Name: J-CH09.DOC Last Saved On: 3/12/98 12:15 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Installing Optional SCSI Devices
Aside from the internal SCSI hard drive preinstalled on your workstation, 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 seven SCSI devices
per SCSI controller.
■
All SCSI hard drives on the same SCSI bus must be either internal or
external, but never both. A configuration with both internal and external
SCSI hard drives requires more than one single-channel SCSI controller.
A multi-channel controller, such as the Compaq SMART-2DH Array
Controller supports both internal and external SCSI hard drives on
separate SCSI buses. (A single-channel SCSI controller can, however,
accommodate both internal and external SCSI tape drives and CD-ROM
drives.)
■
The integrated Wide-Ultra SCSI controller requires that a unique SCSI
ID (0-7) be set for each SCSI device installed. The controller identifies
signals to and from 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.
