Battery-Backed Write Cache Enabler Overview - HP StorageWorks MSA500 G2 User Manual

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Battery-Backed Write Cache Enabler Overview

The Battery-Backed Write Cache Enabler, also known as the battery module,
provides transportable data protection, increases overall controller performance,
and maintains any cached data for up to 72 hours. The NiMH batteries in the
battery module are continuously recharged through a trickle-charging process
whenever the system power is on. Under normal operating conditions, the battery
module lasts for 3 years before replacement is necessary.
LED Description
Logical I/O activity
SCSI bus 0 activity
SCSI bus 1 activity
Cache activity
Drive failure
Active redundancy
Fault
Component identification
Status
Green = System is currently processing
logical requests from the host adapter.
Off = System is not processing any logical
requests.
Green = Outstanding requests exist on the
SCSI bus.
Off = No outstanding requests exist.
Green = Outstanding requests exist on the
SCSI bus.
Off = No outstanding requests exist.
Green = Cache activity is present.
Off = No cache activity is present.
Flashing green = Cache transfer is
pending.
Green = An array-configured drive has
failed.
Off = No drives have failed.
Green = Controllers are operating with
redundancy.
Off = No redundancy exists.
Amber = Error message has been received
by the controller display.
Off = No error message has been received
or no error message is displayed currently.
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