User Manual

56
hard drive can be removed and re-added and only block changes since the removal (as
recorded in the bitmap) will be re-synchronized. To use this feature, select a RAID volume
and click "Action" > "Bitmap".
Note: Bitmap support is only available for RAID 1, 5, 6, and 10.
RAID Recovery
RAID Recovery: If the NAS is configured as RAID 1, RAID 5, or RAID 6 hard drives are
accidentally unplugged from the NAS, 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 hard drive
members are disconnected or unplugged, you can plug in the same hard drives into the same
drive slots and use this function to recover the volume status from "Not active" to "Normal".
The disk volume can be used normally after successful recovery.
Disk volume
Supports RAID
recovery
Maximum number of disk removal allowed
Single
No
-
JBOD
Yes
1 or more
RAID 0
Yes
1 or more
RAID 1
Yes
1 or 2
RAID 5
Yes
2 or more
RAID 6
Yes
3 or more
RAID 10
No
-
Note:
 After recovering a RAID 1, RAID 5 or RAID 6 disk volume from not active to degraded
mode by the RAID recovery, you can read or write the volume normally. The volume
status will be recovered to normal after synchronization.
 If the disconnected drive is damaged, the RAID recovery function will not work.
Standard
RAID 5
QNAP RAID 5
Standard
RAID 6
QNAP RAID 6