Compaq 243850-002 User Manual

This section contains information relating to SCSI device guidelines 
and installation.

When installing and operating SCSI devices, you must 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 using multiple SCSI devices, Compaq recommends that the 
devices be split between Channel A and Channel B, if available, 
for optimum performance.

■

SCSI cable recommendation:

❏

53 inches maximum length twisted-pair, LVD cable with 
built-in terminator, maximum of 5 drives with a minimum 
driving 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