Battery Canister; Figure 2-7 Battery Canister - Silicon Graphics TP9400 RAID Owner's Manual

2: The Controller Enclosure

Battery Canister

Battery Canister
14
The battery canister houses rechargeable batteries and a battery charger board. The
battery canister plugs into the front of the controller enclosure (Figure 2-7). The battery
provides backup power only to the controllers' cache memory. All data stored in memory
will be preserved as long as the batteries can sustain power to the cache memory.
However, the battery will not provide power to the rest of the system during a power
outage. Controllers with the 1 GB interface can store data in cache for up to 3 days.
Controllers with the 2 GB interface can store data in cache for up to 7 days. The system
will not be able to write I/O to the drive enclosures without a backup power source, such
as an Uninterruptible Power Supply (UPS).
Fault-B Indicator
Full Charge-B Indicator
Battery Canister
Figure 2-7
The batteries inside the battery canister have a two-year life expectancy. Replace the
battery canister every two years or whenever it fails to hold a charge. Using the controller
enclosure in a hot environment (above 35º C or 95º F) lowers the life expectancy of the
battery canister. Under these conditions, you may need to replace the battery more often.
The service label on the battery canister provides a blank line for recording the last date
on which the battery was serviced (see Figure 3-8 on page 45). Check this label to
determine when to replace the canister. See the storage management software (TPSSM7)
for information about using the software to track battery age.
Full Charge-A Indicator
Fault-A Indicator
007-4304-003
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