HP Surestore Disk Array 12h and FC60 - Manual (Page 201)

Applying Power to the Disk Array 201
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Table 27 Normal LED Status for the Disk Enclosure
Module LED Normal State
Front Enclosure System Fault Off
System Power On (green)
Disk Activity Flashing (green) when disk is being accessed.
Disk Fault LED Off
Power Supply Power Supply On (green)
BCC Module Term. Power On (green)
Full Bus Off (if split bus) On (green - if single bus)
BCC Fault Off
Bus Active On (green bus is available for use)
Off (Isolator chip disabled & bus not avail.)
LVD On (green bus operating in LVD mode)
Off (bus operating in single ended mode)
Fan Module Fan On (green)