Array Behavior When A Drive Fails - Dell EqualLogic PS4100 Hardware Maintenance Manual

PS4100 Hardware Maintenance Guide
Description
Drive activity indicator (ACT LED)
Drive status indicator (PWR LED)

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.
8
Figure 6 LEDs on 3.5-inch Drives
Figure 7 LEDs on 2.5-inch Drives
Table 4 Drive LED States
Indicator States
Blinking green: Drive is busy
Steady green: No drive activity
Green: Drive OK
Amber: Drive failed
Off: No power to drive
Maintaining Drives