Front of the MU Management Unit
54 U41858-J-Z126-2-76
Hard disk drive control indicators
Figure 12: Front - Detailed view: Indicators on a hard disk module
1 HDD BUSY (green)
– Lights up: HDD in active phase
– Does not light up: HDD inactive
2 HDD FAULT (orange) (in conjunction with a RAID controller)
– Does not light up: no HDD error
– Lights up: HDD Faulty or Rebuild Stopped (drive defective, needs replacing, a rebuild
process was stopped or the HDD module is not correctly inserted)
– Slow flashing: HDD Rebuild (the data is being restored after changing a hard disk drive)
– Fast flashing: HDD Identify
– Four fast flashes/pause: HDD Predicted Fault
– Two fast flashes/pause: HDD Hot Spare (The corresponding drive has failed).
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