ESS Series User’s Manual
7 Appendix B--- Disk Hot Swap Operation
The hot swap operation means you can remove disk without shut down the system and unplug
the power cable. It enhances the system recovery capability and has sound expansibility and
flexibility.
The hot swap has the following situations:
When the disk is free, hot swap operation will not result in system damage.
When the disk is working, hot swap operation will not result in system malfunction, data loss (or
can resume data).
Hot swap-Remove disk
There are two situations: remove the damaged disk/remove current working disk.
Remove the damaged disk: You can remove from the rack directly. The data is
damaged since the disk is malfunction.
Remove the properly working disk: You need to meet the following conditions if
you want to remove the disk without the risk of data loss.
Usually we do not recommend hot swap operation when system is running properly and
there is no damaged disk.
The hot swap disk shall be set as RAID6/RAID5/RAID1.
The hot swap disk group shall be in working status.
RAID5 and RAID 6 can only hot swap (add/remove) one disk, RAID6 can only
hot swap (add/remove) two disks. After the hot swap operation, the RAID status
becomes degrading and one more hot swap operation will result in data loss of
the whole group!
Hot swap-Add disk
Caution
The operation here just follows the remove disk in the previous paragraphs.
You can only add a disk after you remove one disk from the same RAID group. It is to
guarantee data security.
You can only add disk to the degrading RAID6/RAID5/RAID1 group. After the add operation,
RAID status becomes ready. Its status becomes working after the synchronization operation.
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