Figure 2-6 Redundant Controllers And Indicator Lights - Silicon Graphics TP9400 RAID Owner's Manual

2: The Controller Enclosure
12
Controller A (Top)
Controller B (Bottom)
Redundant Controllers and Indicator Lights
Figure 2-6
The controller enclosure supports one or two controller canisters, which attach to hosts
via Fibre Channel connections. When using a single-controller array, the controller must
be installed in slot A.
You can hot swap a failed controller canister, replacing it while the controller enclosure
is in operation, as long as the failed controller is one of a redundant pair (two controllers
attached to the same host) and has a "passive" or "offline" status in the storage
management software (TPSSM7).
If cache mirroring is enabled in redundant controllers and one controller fails, the second
controller will assume processing functions without data loss. However, some or all data
may be lost if cache mirroring is disabled and a failure occurs before data can be written
from cache memory to disk.
If you replace the controller canister and continue to experience problems, the controller
enclosure may have defective components or connections. Check the storage
management software (TPSSM7) for indications of other component failures.
Power
Fault
Heartbeat
R Reset
Status
54067-c
007-4304-003