Table of Contents
Advertisement
Chapter 4 Advanced operation
4.1 Rebuild
If one physical disk of the RG which is set as protected RAID level (e.g.: RAID 3,
RAID 5, or RAID 6) is FAILED or has been unplugged/removed, then the status
of RG is changed to degraded mode, the system will search/detect spare disk to
rebuild the degraded RG to a complete one. It will detect dedicated spare disk as
rebuild disk first, then global spare disk.
i8500 support Auto-Rebuild. The following is the scenario:
Take RAID 6 for example:
1.
When there is no global spare disk or dedicated spare disk in the
system, controller will be in degraded mode and wait until (A) there is
one disk assigned as spare disk, or (B) the failed disk is removed and
replaced with new clean disk, then the Auto-Rebuild starts. The new
disk will be a spare disk to the original RG automatically.
If the new added disk is not clean (with other RG information), it would
be marked as RS (reserved) and the system will not start "auto-rebuild".
If this disk is not belonging to any existing RG, it would be FR (Free)
disk and the system will start Auto-Rebuild.
If user only removes the failed disk and plugs the same failed disk in
the same slot again, the auto-rebuild will start running. But rebuilding in
the same failed disk may impact customer data if the status of disk is
unstable. Thecus suggests all customers not to rebuild in the failed
disk for better data protection.
2.
When there is enough global spare disk(s) or dedicated spare disk(s)
for the degraded array, controller starts Auto-Rebuild immediately. And
in RAID 6, if there is another disk failure occurs during rebuilding,
controller will start the above Auto-Rebuild process as well. Auto-
Rebuild feature only works at that the status of RG is "Online". It will
not work at "Offline". Thus, it will not conflict with the "Roaming".
3.
In degraded mode, the status of RG is "Degraded". When rebuilding,
the status of RG/VD will be "Rebuild", the column "R%" in VD will
display the ratio in percentage. After complete rebuilding, the status will
become "Online". RG will become completely one.
- 58 -
Advertisement
Table of Contents
