Power Off Procedures; Battery Backup Operations - HP XP P9500 Owner's Manual

Follow this procedure exactly when powering the disk array on. Refer to the illustration of the
control panel as needed.
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Power Off procedures

CAUTION:
Do not attempt to power down the disk array other than during an emergency.
Prerequisites:
Follow this procedure exactly when powering the disk array off.
1.
2.

Battery backup operations

The P9500 is designed so that it cannot lose data or configuration information if the power fails.
The battery system is designed to provide enough power to completely destage all data in the
cache if two consecutive power failures occur and the batteries are fully charged. If the batteries
do not contain enough charge to provide sufficient time to destage the cache when a power failure
occurs, the cache operates in write through mode. This synchronously writes to HDDs to prevent
slow data throughput in the cache. When the battery charge is 50% or more, the cache write
protect mode operates normally.
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On the control panel, check the amber BS LED and make sure it is lit. It indicates that the disk
array is in standby mode.
In the PS area on the control panel, move the Enable switch to the ENABLED position. Hold
the switch in the Enabled position and move the PS ON switch to the ON position. Then release
the ENABLE switch.
Wait for the disk array to complete its power-on self-test and boot-up processes. Depending
on the disk array configuration, this may take several minutes.
When the Ready LED is ON, the disk array boot up operations are complete and the disk
array is ready for use.
NOTE: If the Alarm LED is also on, or if the Ready LED is not ON after 20 minutes, please
contact HP Technical Support. The disk array generates a SIM that provides the status of the
battery charge (see "Cache destage batteries" (page
Only a trained HP support representative can shut down and power off the disk array.
Ensure that all software specific shutdown procedures have been completed. Please see the
applicable user manuals for details.
Ensure that all I/O activity to the disk array has stopped. You can vary paths offline and/or
shut down the attached hosts.
In the PS area on the power panel, move the Enable switch to the Enabled position. Hold the
switch in the Enabled position and press the PS OFF switch on the Operator Panel.
Wait for the disk array to complete its shutdown routines. Depending on the disk array
configuration and certain MODE settings, it can take up to 20 minutes for the disk array to
copy data from cache to the disk drives and for the disk drives to spin down.
NOTE: If the Ready and PS LEDs do not turn OFF after 20 minutes, contact HP Technical
Support.
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