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38 
 HP MSA 500 G2 Storage System Maintenance and Service Guide 
 
Controller LEDs 
 
   
Item LED 
Description 
Status 
0-2 
Busy status 
Green = Controller is idle. 
Off = Controller is operating at full capacity.
 
3-5 No 
function 
— 
Host port A notification 
Green = Notify On Event command is 
active. 
Off = No Notify On Event command is 
active.
 
Host port B notification 
Green = Notify On Event command is 
active. 
Off = No Notify On Event command is 
active.
 
8 Idle 
heartbeat 
Controller is idle and functioning. 
Active/Standby 
Green = Controller is active. 
Off = Controller is in standby.
 
10 
DMA activity 
Green = DMA transfers are active. 
Off = No DMA transfers are active.