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Configuring Your System
Determining SCSI Storage Device IDs
When you add or remove a CD-ROM drive, a tape drive, or fixed disk drives, you may
want to consider how these are configured and whether you want to reconfigure them.
These storage devices all reside on one or more SCSI buses that connect to the system
board and to the StorageWorks backplane. The system configuration determines a unique
ID for each device. (The diskette drive has its own dedicated bus and is not included in
the SCSI configuration.)
When adding or changing devices, be careful to avoid assigning device IDs (SCSI IDs)
already in use. Duplicate IDs result in one or more devices not being recognized by the
system.
To determine the available SCSI IDs for all SCSI storage devices, follow the steps in
Table 6–2 and refer to Example 6-6 and Table 6-3.
Table 6–2: Determining Available SCSI IDs
Step
Action
1
Enter the show device
command to display the SCSI
configuration.
2
Examine the ADDR column in
the display.
3
Write down the list of unused
SCSI IDs.
Example 6–6: The show device Display
>>> show device
dka400.4.0.6.0
dva0.0.0.0.1
ewa0.0.0.2004.0
ewb0.0.0.11.0
pka0.7.0.2001.0
6-24 AlphaServer 1000A Rackmount Owner's Guide
Result
The system responds with a display
similar to that shown in Example 6-6.
The ADDR column lists the SCSI
address of each device connected to the
SCSI bus. The first number in the SCSI
address is the SCSI ID. It must be a
unique number in the range 0 to 7. Any
unused SCSI IDs in this range are
available for use by the devices that you
want to connect to the system.
DKA400
RRD45
DVA0
EWA0
08-00-2B-E5-6A-41
EWB0
08-00-2B-E1-03-19
PKA0
SCSI Bus ID 7
2893
2.10
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Troubleshooting
