User guide

1-6 Compaq StorageWorks RAID Array 4100 User Guide
RA4000 Controller—If the failed RA4000 Controller cache is replaced with
the same size cache on the existing RA4000 Controller, the controller can be
removed, the cache replaced, and the controller reinstalled without interrupting
system operation. To change the cache size, you must power down the system.
See Chapter 4, “Troubleshooting,” for specific limitations when replacing
hot-pluggable components.
Hot-Pluggable Drives
The Compaq RA4100 supports 1-inch Compaq Hot Plug Ultra2 Disk Drives.
The RA4100 accepts 1-inch standard height drives. You must mount the drives
on Compaq hot-pluggable drive trays. SCSI IDs are assigned automatically
according to the drive location.
Maximum Storage
You may install a maximum of 12 drives in the Compaq RA4100.
SCSI ID Assignments
Each device on a SCSI bus must have a unique identification number in the
range of 0 to 6. The SCSI ID determines the device priority when attempting
to use the SCSI bus. The highest priority, SCSI ID 7, is reserved for the
controller.
SCSI IDs are assigned automatically in the storage system according to the
drive bay used for each drive. It is not necessary to assign SCSI IDs manually.
The SCSI ID for each bay is indicated on the front panel.
Compaq StorageWorks RA4000 Controller
The RA4000 Controller is a drive array controller designed for installation in
the RA4100. The RA4000 Controller supports Wide-Ultra SCSI-3, Fast-Wide
SCSI-2, and Fast SCSI-2. The RA4100 is equipped with one installed RA4000
Controller.