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9
SCSI configurations
9.1
Addresses for SCSI devices
All devices attached to the SCSI port or a SCSI controller (hard disk and other
drives) must have a unique address, known as the SCSI ID. When attaching
drives, make sure you do not allocate an ID which has already been assigned.
The SCSI IDs for the backup drives are set on the drive. For this drives the
SCSI-ID 6 are assigned.
All the necessary SCSI terminations are already installed on the server. No
terminations may be plugged in to the drives.
The SCSI IDs for the hard disk drives are not set on the drive itself, but deter-
mined by the slot on the SCSI backplane.
The two slots of the hard disk drives lead to a SCSI backplane. The hard disk
drives are connected in series to a channel (SCSI ID 0: left drive, SCSI ID 1:
right drive). The two lower drives are connected to the SCSI channel A, the two
upper drives to the SCSI channel B.
configuration
Channel B (above)
Channel A (below)
Table 27: SCSI IDs
U41243-J-Z156-1-76
SCSI-IDs
left drive
right drive
0
1
0
1
117
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