PS4100 Hardware Maintenance Guide Maintaining Drives
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Figure 6 LEDs on 3.5-inch Drives
Figure 7 LEDs on 2.5-inch Drives
Table 4 Drive LED States
Array Behavior When a Drive Fails
How an array handles a drive failure depends on whether a spare drive is available and whether the RAID
set containing the failed drive is degraded.
For example:
• If a spare drive is available, the array automatically uses it to replace the failed drive. Performance is
normal after reconstruction completes.
• If a spare drive is not available the RAID set will become degraded (except a RAID 6 set). Performance
may be impaired. A RAID 6 set can survive two simultaneous drive failures.
Description Indicator States
Drive activity indicator (ACT LED) Blinking green: Drive is busy
Steady green: No drive activity
Drive status indicator (PWR LED) Green: Drive OK
Amber: Drive failed
Off: No power to drive
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