HP LH4r HP NetRAID-4M Installation Guide - Page 85

Battery Reconditioning, Recondition

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Understanding The Battery Subsystem though the batteries are not being used to maintain the contents of cache memory. Note: The controller will not generate a low battery condition when you first power up your HP NetRAID-4M, even if your batteries' holdover time is less than 24 hours. It reports battery low once the batteries are initially charged (and the batteries' holdover time drops below 24 hours). As mentioned earlier, be aware that your batteries may not be able to provide their minimum holdover time until they reach their initial full charge. In general, you should closely monitor your HP NetRAID-4M controller during a battery low condition to ensure that its battery status returns to normal (OK) within 2-3 hours. Contact your technical support representative if a low battery condition remains on beyond normal charging time; it could indicate a faulty battery. Battery Reconditioning A full cycle discharge and recharge is recommended every six months in order to: s Calibrate the battery monitor circuitry. s Overcome any long-term degradation of the batteries' capacity caused by trickle-charging the batteries. Battery reconditioning starts only when you initiate it. This allows you to schedule reconditioning at a time when optimal performance is not needed. To initiate a battery reconditioning immediately, do one of the following: s Click the Recondition button in the Controller Properties dialog box in FAST. s Issue the CLI command controller battery_recondition. For more information on using this command, see the Command Line Interface Reference. 8-3

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8-3
Understanding The Battery Subsystem
though the batteries are not being used to maintain the contents of
cache memory.
Note:
The controller will
not
generate a low battery
condition when you first power up your HP NetRAID-4M,
even if your batteries
’
holdover time is less than 24 hours. It
reports battery low once the batteries are initially charged
(and the batteries
’
holdover time drops below 24 hours). As
mentioned earlier, be aware that your batteries may not be
able to provide their minimum holdover time until they
reach their initial full charge.
In general, you should closely monitor your HP NetRAID-4M
controller during a battery low condition to ensure that its battery
status returns to normal (OK) within 2-3 hours. Contact your
technical support representative if a low battery condition remains
on beyond normal charging time; it could indicate a faulty battery.
Battery Reconditioning
A full cycle discharge and recharge is recommended every six
months in order to:
■
Calibrate the battery monitor circuitry.
■
Overcome any long-term degradation of the batteries
’
capacity
caused by trickle-charging the batteries.
Battery reconditioning starts only when you initiate it. This allows
you to schedule reconditioning at a time when optimal performance
is not needed.
To initiate a battery reconditioning immediately, do one of the
following:
■
Click the
Recondition
button in the Controller Properties
dialog box in FAST.
■
Issue the CLI command
controller battery_recondition
. For
more information on using this command, see the
Command
Line Interface Reference
.