HP LH4r HP NetRAID-4M Installation Guide - Page 84

Initial Battery Charge, Battery Low Conditions, Normal Causes of a Battery Low Condition

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Hewlett-Packard NetRAID-4M Controller Installation Guide full charge. A full charging cycle - from fully discharged to fully charged - typically requires 2-3 hours to complete. Initial Battery Charge When you first power up your controller, its batteries will be partially or fully discharged and will require charging. This initial charge time depends on the current charge level of the batteries, and could take anywhere from a few minutes to several hours. You can begin using your controller immediately after initial power up, but be aware that the batteries may not be able to preserve the contents of cache memory for the full holdover time stated previously until they reach full charge. Battery Low Conditions Under normal operating conditions, the controller reports its batteries' status as OK. OK means that the batteries are either fully charged, or are charging properly, and have at least 24 hours of holdover time remaining. Whenever the batteries' holdover time drops below 24 hours (as measured by the batteries remaining capacity), the controller generates a low battery condition. The HP NetRAID-4M host driver displays a battery low condition with an event entry in the system's event log (on Windows NT systems) Note: To avoid the possibility of data loss caused by a power outage during a low battery condition, the controller automatically flushes its cache contents to disk and disables further use of the cache until the low battery condition ends. Normal Causes of a Battery Low Condition A low battery condition normally occurs if the controller was in a powered-off state for more than a few hours. If the controller is shutdown properly (as part of normal system shutdown), the controller flushes its cache contents to disk and "disconnects" its batteries from cache memory. The controller continues drawing a small amount of current from the batteries during power-off times, to maintain its battery monitoring and capacity settings. It is normal for the batteries to discharge slightly during power-off times, even 8-2

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8-2
Hewlett-Packard NetRAID-4M Controller Installation Guide
full charge. A full charging cycle
—
from fully discharged to fully
charged
—
typically requires 2-3 hours to complete.
Initial Battery Charge
When you first power up your controller, its batteries will be
partially or fully discharged and will require charging. This initial
charge time depends on the current charge level of the batteries, and
could take anywhere from a few minutes to several hours. You can
begin using your controller immediately after initial power up, but
be aware that the batteries may not be able to preserve the contents
of cache memory for the full holdover time stated previously until
they reach full charge.
Battery Low Conditions
Under normal operating conditions, the controller reports its
batteries
’
status as OK. OK means that the batteries are either fully
charged, or are charging properly, and have at least 24 hours of
holdover time remaining.
Whenever the batteries
’
holdover time drops below 24 hours (as
measured by the batteries remaining capacity), the controller
generates a low battery condition. The HP NetRAID-4M host driver
displays a battery low condition with an event entry in the system
’
s
event log (on Windows NT systems)
Note:
To avoid the possibility of data loss caused by a power
outage during a low battery condition, the controller
automatically flushes its cache contents to disk and disables
further use of the cache until the low battery condition ends.
Normal Causes of a Battery Low Condition
A low battery condition normally occurs if the controller was in a
powered-off state for more than a few hours. If the controller is shut-
down properly (as part of normal system shutdown), the controller
flushes its cache contents to disk and
“
disconnects
”
its batteries
from cache memory. The controller continues drawing a small
amount of current from the batteries during power-off times, to
maintain its battery monitoring and capacity settings. It is normal
for the batteries to discharge slightly during power-off times, even