Storage Devices; Determining Scsi Storage Device Ids - DEC AlphaServer 1000A Owner's Manual

Storage Devices

Configuring the storage devices on your system requires assigning the correct SCSI
IDs according to the type of configuration you choose: single-controller, dual-
controller, or triple-controller.

Determining SCSI Storage Device IDs

When you add or remove a CDROM drive, a tape drive, or StorageWorks drives,
you may want to consider how these storage devices are configured and whether you
want to reconfigure them. They 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 from the ARC
console, select the Supplementary menu from the ARC Boot menu, and "Display
hardware configuration" from the Supplementary menu.
To determine the available SCSI IDs for all SCSI storage devices from the SRM
console, follow the steps in Table 6-2 and refer to Example 6-6.
Table 6-2 Determining Available SCSI IDs (SRM Console)
Step
1
2
3
AlphaServer 1000A Owner's Guide
Action
Enter the show device
command to display the SCSI
configuration.
Examine the ADDR column in
the display.
Write down the list of unused
SCSI IDs.
Result
The system responds with a display
similar to that shown in Example 6-5.
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 6. Any unused SCSI IDs
in this range are available for use by the
devices that you want to connect to the
system.
Configuring 6-23