Understanding The Battery Subsystem - HP D7171A - NetServer - LPr Installation Manual

Understanding The Battery
Subsystem
For information about...
Initial Battery Charge
Battery Low Conditions
Battery Reconditioning
Recovering Data from the Controller's Cache
The HP NetRAID-4M controller contains a pair of replaceable
nickel-metal hydride (NiMH) batteries and associated
charging/monitoring circuitry designed to preserve the contents of
its non-volatile cache memory in the event of a power loss or
extended power-off conditions. Power loss can occur due to sudden
interruption of power to the server; extended power-off situations
can occur during system maintenance, hardware upgrades, etc.
This battery holdover time is dependent on the batteries' charge
level and age, and the size of the DIMM. For a list of battery
holdover times, see Appendix E, Specifications.
The controller keeps its batteries fully charged by applying a small
trickle charge to the batteries during normal operation. If the
controller's monitoring circuits determine that the batteries are less
than fully charged, it automatically activates the fast charger. The
fast charger continues charging the batteries until they reach their
8
Turn to...
page 8-2
page 8-2
page 8-3
page 8-4
8-1