HP 201723-B21 - StorageWorks Modular SAN Array 1000 Hard Drive Maintenance And Service Manual page 22

Controller LEDs
During normal runtime, the array controller has 18 LEDs that indicate controller activity or malfunction.
15 14 13
7 6 5
Item Name
1
Drive failure
2
Cache activity
3
SCSI bus 1 activity
4
SCSI bus 0 activity
5
Logical I/O activity
6
Direct Memory Access
(DMA) activity
7
Active/Standby
8
Heartbeat
9
Fault
10
Redundancy active
11–13
Busy status — These
three LEDs are used to
progressively represent the
processing load on the
controller.
14–18
Fibre Channel ID
22
System components and LEDs
12 11 10 9 8
4 3 2 1 0
Condition
On
On
Off
Blinking
On
On
On
On
On
Off
Blinking
On (amber)
On (green)
On
Off
—
17
16
15588
Meaning
A configured hard drive has failed.
Cache active.
No cache activity.
Cache transfer pending.
Activity on the bus.
Activity on the bus.
Currently processing logical requests from
the host adapter.
DMA transfers are active.
This controller is active.
This controller is standby.
The controller is functioning properly.
An error message has been sent to the
controller LCD display panel.
The two controllers and the two Fibre
Channel I/O modules are in a redundant
mode of operation.
The controller is idle.
The controller is operating at full capacity.
Indicates the 5–bit Arbitrated Loop Physical
Address (ALPA) assigned to this array
controller (not applicable in fabric mode).