HP StorageWorks 500 G2 Modular Smart Array - 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.