Battery-backed write cache enabler overview – HP StorageWorks 500 G2 Modular Smart Array User Manual
Page 21

Component
identification
21
Item LED
Description
Status
11
Logical I/O activity
Green = System is currently processing
logical requests from the host adapter.
Off = System is not processing any logical
requests.
12
SCSI bus 0 activity
Green = Outstanding requests exist on the
SCSI bus.
Off = No outstanding requests exist.
13
SCSI bus 1 activity
Green = Outstanding requests exist on the
SCSI bus.
Off = No outstanding requests exist.
14
Cache activity
Green = Cache activity is present.
Off = No cache activity is present.
Flashing green = Cache transfer is
pending.
15
Drive failure
Green = An array-configured drive has
failed.
Off = No drives have failed.
16
Active redundancy
Green = Controllers are operating with
redundancy.
Off = No redundancy exists.
17
Fault
Amber = Error message has been received
by the controller display.
Off = No error message has been received
or no error message is displayed currently.
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.