106 Chapter 11 In-service field maintenance for 5U enclosures
The CM has a number of ports, each with independent status LEDs. Those items in the state column with an
asterisk (*) indicate a fault condition.
LED
Type
Color
State
Status
SAS expansion
port
Amber
On*
Critical SAS cable fault
Fast flash* (1s on, 1s
off)
SAS Unit identification (UID) active
Slow flash* (3s on, 1s
off)
Non-critical SAS cable fault
Off
SAS expansion port functioning properly
Hardware fault
Amber
On*
CM hardware fault
Flashing
Part of sequence as CM comes online, on standby
Off
CM functioning properly
OK to remove
White
On
Ready for removal, the cache is clear
Off
Do not remove the CM, cache still contains unwritten
data
Figure 83 Controller module LEDs to examine for fault conditions
To replace a 5U enclosure controller module:
1. Complete the following actions to remove the faulty CM :
a. Facing the rear of the storage enclosure, carefully remove all CM connections.
b. Grasp the CM release latch between thumb and forefinger, then squeeze together to release the latch
and handle.