HP Integrity rx4640 Server - Manual (Page 18)

Board Components and Features
Figure 1-5: Battery packs
This data protection (and the time limit) also applies if an equipment failure or power
outage occurs. When power is restored to the system, an initialization process writes
the preserved data to the hard drives.
The batteries are continuously recharged using a trickle-charging process whenever
the system power is on. Under normal operating conditions, a battery pack lasts for
three years before replacement is necessary.
IMPORTANT: The batteries on a new array controller may have a low charge when the
controller board is first installed. In this case, a Power-On Self-Test (POST) message is
displayed when the server is powered up, indicating that the array accelerator is temporarily
disabled. No action is required on your part, since the internal circuitry automatically recharges
the batteries and enables the cache. The recharge process takes less than four hours. The
array controller will function properly during this time, although without the performance
advantage of the array accelerator. When the batteries are charged to an acceptable capacity,
the array accelerator is automatically enabled.
For battery replacement instructions, refer to Chapter 8, “Upgrading and Replacing
Options.”
HP Smart Array 5300 Controller User Guide 1-7
HP CONFIDENTIAL
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