Areca ARC-1222 - Hot-Swap Disk Drive Support; Auto Declare Hot-Spare

APPENDIX
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automatically take its place and he data previously located on the
failed drive is reconstructed on the Global Hot Spare.
For this feature to work properly, the global hot spare must have
at least the same capacity as the drive it replaces. Global Hot
Spares only work with RAID level 1, 10, 3, 5, 6, 30, 50, or 60
volume set. You can congure up to three global hot spares with
SAS RAID controller.
The “Create Hot Spare” option gives you the ability to dene
a global hot spare disk drive. To effectively use the global hot
spare feature, you must always maintain at least one drive that is
marked as a global spare.
• Hot-Swap Disk Drive Support
The SAS RAID controller chip includes a protection circuit that
supports the replacement of SAS/SATA hard disk drives without
having to shut down or reboot the system. A removable hard
drive tray can deliver “hot swappable” fault-tolerant RAID solu-
tions. This feature provides advanced fault tolerant RAID protec-
tion and “online” drive replacement.
• Auto Declare Hot-Spare
If a disk drive is brought online into a system operating in de-
graded mode, the SAS RAID controllers will automatically de-
clare the new disk as a spare and begin rebuilding the degraded
volume. The Auto Declare Hot-Spare function requires that the
smallest drive contained within the volume set in which the failure
occurred.
In the normal status, the newly installed drive will be recong-
ured an online free disk. But, the newly-installed drive is auto-
matically assigned as a hot spare if any hot spare disk was used
to rebuild and without new installed drive replaced it. In this
condition, the Auto Declare Hot-Spare status will be disappeared
if the RAID subsystem has since powered off/on.
Important:
The hot spare must have at least the same capacity as the
drive it replaces.