Scsi Ids - Compaq ProLiant Storage System User Manual

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6 Configuration Planning

SCSI IDs

All devices on a SCSI bus must have unique identification numbers.
The drives used with the ProLiant Storage System are automatically assigned
SCSI ID numbers depending on the drive bay in which they are installed.
CAUTION: Server lockups could occur if a drive is installed in a drive
bay set with a SCSI ID that is already used by another device in the server
if both devices are on the same SCSI bus.
For example: assume that the SCSI controller in the server is connected to
a tape drive (SCSI ID of 1) and a CD-ROM drive (SCSI ID of 6) installed in
the server. If the external port of the same SCSI controller (same SCSI bus)
is connected to a ProLiant Storage System, drives must be installed in the
storage system drive bays with IDs from 2 through 5 to avoid using IDs 1
and 6, the same IDs that have been assigned to the internal SCSI devices
IMPORTANT:
All SCSI hard drives on the same SCSI bus must be either
internal (within the server) or in an external storage system, but not 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 SCSI Array Controller, supports both internal
and external SCSI hard drives on separate SCSI buses.