C-2 Hard Drive Installation Guidelines
Compaq Confidential - Need to Know Required
Writer: Lydia Sanchez Part Number: 123456-001 File Name: appc.doc
Last Saved On: 04/11/00 5:36 PM Last Saved By: Lydia Sanchez
SCSI Devices and Guidelines
Guidelines for SCSI Devices
When installing and operating SCSI devices, you must follow these
guidelines:
■ A single Ultra SCSI, Ultra-Wide SCSI, Wide-Ultra SCSI, Wide
Ultra2 SCSI or Ultra3 SCSI, controller allows you to daisy-chain
up to 15 additional SCSI devices. Counting the controller, that
amounts to 16 total SCSI devices.
■ If two SCSI controllers are each connected to separate system
board SCSI connectors, each controller may have seven SCSI
devices attached. This will give a total of 16 SCSI devices on the
system.
■ The SCSI controller requires a unique SCSI ID (0-7 or 8-15) 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 communication between the controller and the device. The
reserved and availagle SCSI ID numbers for SCSI devices are:
❏ 0 is reserved for the primary hard drive.
❏ 7 is reserved for the controller.
❏ 1 through 6 and 8 through 15 are available for all other SCSI
devices.
■ If only one SCSI hard drive is used, it should be installed in the
lowest numbered bay (bay 1).
■ On a Compaq Professional Workstation SP750, Bay 4 is reserved
for the CD-ROM or DVD-ROM drive. Do not install a SCSI
device in this bay.
■ Every SCSI chain or circuit must be terminated (closed) at both
ends. Some system boards have both ends of the SCSI cable
connected to, and terminated by, the system board. Termination
can be accomplished in one of several ways:
❏ Use a cable with a built-in terminator.
❏ Use a cable with a terminating resistor plug in the last
connector.
❏ Connect a SCSI device with its termination enabled into the
last connector.
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