Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Hardware User's Manual page 75

The SCSI bus configuration switch selects the eight (0 – 7) SCSI bus
configurations in the pedestal. Each bus configuration determines the slot
device addresses (0 – 6) for both 8-bit and 16-bit devices. The pedestal is
configured at the factory for split-bus operation (configuration switch set to 6).
To change the configuration of the bus, you must remove the left side panel to
gain access to the backplane and the configuration switch.
NOTE: SCSI device addresses 6 and 7 are reserved for the RAID Array controllers. The
top controller slot in the pedestal is assigned device address 7 and the bottom slot
(redundant controller) is device address 6. The controller allows a maximum of 14 disk
devices on each of its device buses.
To remove the side panel, proceed as follows:
1. Quiesce the host bus by shutting down the host system.
CAUTION: To allow the UPS to supply power while the cache is being flushed
to disk, do not unplug the base pedestal from the UPS.
2. Unplug the base pedestal power cord from the wall outlet.
3. Unplug the UPS power cord from the wall outlet. The UPS will now
signal the controller to flush the cache.
4. Wait until the UPS shuts down completely (this may take several
minutes).
5. Power off the base pedestal and plug the UPS power cord into the wall
outlet.
6. Disconnect the SCSI cable from the host connector on the rear panel.
7. Remove the front door on the pedestal.
8. Remove the cover screw from the left side panel (Figure 3–8).
9. Grasp the handhold at the rear of the panel and pull the panel toward the
rear and clear of the cabinet.
Maintenance 3-15