QNAP TS-859 Pro+, User Manual, Page: 53 / 242

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3.2.2 RAID Management
* This function does not apply to one-bay model, and TS-210.
You can perform RAID capacity expansion (RAID 1/ 5/ 6), RAID level migration
(single disk/ RAID 1/ RAID 5), or configure the spare drive (RAID 5/ 6) with the data
retained.
Bitmap improves the time for RAID rebuilding after a crash, or removing or
re-adding a member drive of the RAID configuration. If an array has a bitmap, the
member drive can be removed and re-added and only blocks changes since the
removal (as recorded in the bitmap) will be re-synchronized.
Note: Bitmap support is only available for RAID 1, 5, and 6.
RAID Recovery: When the NAS is configured as RAID 5 (or RAID 6) and 2 (or 3)
hard drives are uplugged from the server accidentally, you can plug in the same
hard drives into the same drive slots and click “Recover” to recover the volume
status from “Not active” to “Degraded mode”.
If the disk volume is configured as RAID 0 or JBOD and one or more of the drive
members are disconnected, you can use this function to recover the volume status
from “Not active” to “Normal”. The disk volume can be used normally after
successful recovery.
Note: If the disconnected drive member is damaged, the RAID recovery function
will not work.
RAID recovery is not supported by TS-110, TS-210, TS-119.
For the online tutorial, please visit
http://www.qnap.com/pro_features.asp .