11Hp Netraid-2M Battery Backup Unit; Charging The Battery; Checking The Status Of The Battery Backup Unit; To Check Battery Status With Hp Netraid Express Tools - HP P3410A - NetRAID 1M RAID Controller Installation And Configuration Manual

11 HP NetRAID-2M Battery Backup Unit
The Battery Backup Unit preserves data handled by the HP NetRAID-2M adapter
by providing protection from power supply interruptions to the HP NetRAID
cache memory.
The HP NetRAID Battery Backup Unit monitors the voltage level of the DRAM
modules installed on the HP NetRAID-2M adapter and supporting circuitry. If
the voltage drops below a predefined level, the Battery Backup Unit switches the
memory power source from the adapter to the battery pack attached to the
adapter. As long as the voltage level is below the predefined value, the
HP NetRAID Battery Backup Unit provides the memory refresh cycles necessary
to retain the contents of the HP NetRAID-2M memory modules. If the voltage
level returns to an acceptable level, the Battery Backup Unit switches the power
source back to the HP NetRAID-2M adapter.

Charging the Battery

The battery pack is shipped fully charged, and it recharges automatically.
NOTE

Checking the Status of the Battery Backup Unit

The batteries installed in the Battery Backup Unit carry a one-year warranty, but
you can expect them to last at least twice that long. The battery life is considered
to be "low" if the battery has been through 1,000 recharge cycles. You can check
the status of the battery, and the software will warn you if the battery needs to be
replaced.

To Check Battery Status with HP NetRAID Express Tools

1. Restart the HP Netserver, and press <Ctrl> <M> at the prompt to start
the HP NetRAID Express Tools utility.
The full data retention time is not available unless the battery
pack is fully charged. If the battery pack is not charged, set the
HP NetRAID cache write policy option to Write-Through
while charging the battery pack. After the battery pack is fully
charged, you can change the cache write policy to Write-Back.
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