Scsi Devices; Guidelines For Using Scsi Devices - Compaq Evo W8000 Hardware Reference Manual

SCSI Devices

Guidelines for Using SCSI Devices

Compaq Evo Workstation W8000 Hardware Reference Guide
This section contains information relating to SCSI device guidelines
and installation.
When installing and operating SCSI devices, follow these guidelines:
A single Ultra SCSI controller supports up to seven SCSI
devices per channel.
Each Wide-Ultra SCSI, Ultra-Wide SCSI, Wide Ultra2 SCSI,
Ultra 320 SCSI, or Ultra 160 SCSI controller supports up to
15 SCSI devices per channel.
If you are using multiple SCSI devices, Compaq recommends
that the devices be split between Channel A and Channel B, if
available, for optimum performance.
Compaq recommends the following SCSI cable:
53 inches maximum length twisted-pair, LVD cable with
built-in terminator, maximum of 5 drives with a minimum
drive spacing of 5.25 inches
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 by 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 available SCSI ID numbers for SCSI
devices are:
0—reserved for the primary hard drive
7—reserved for the controller
1 through 6 and 8 through 15—available for all other SCSI
devices
Either a CD-ROM or DVD-ROM is shipped in bay 4.
Hard Drive Installation
B-3