2–1
2 Maintaining Disk Drives
The array includes up to 16 hot-swappable disk drives, either Serial Attached
SCSI (SAS) or Serial ATA (SATA). Disk drive maintenance topics apply to both
SAS and SATA disk drives.
Identifying Failed Disk Drives
A disk drive failure is indicated by:
• LEDs on the disk drive. See Interpreting Disk Drive LEDs on page 2-2.
• A message on the console, in the event log, or in the Group Manager GUI
Alarms panel describes a disk drive failure.
• The GUI Member Disks window or the CLI
member select show disks
command shows a disk drive failure.
Array Behavior When a Disk Drive Fails
How an array handles a disk drive failure depends on whether a spare disk drive is
available and whether the RAIDset containing the failed disk drive is degraded.
For example:
• If a spare disk drive is available, it replaces the failed disk drive. Performance
is normal after reconstruction completes.
• If a spare disk drive is not available and the failed disk drive is in a RAIDset
with no previous disk drive failure, the RAIDset can become degraded.
Performance may be impaired.
• If a spare disk drive is not available and the failed disk drive is in a RAIDset
that is already degraded, data may be lost and must be recovered from a
backup.
• If a disk drive fails, do not remove and re-install it in the array. It must be
replaced.
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