Operation Manual

148
Recovering Failed RAID Disk Volumes
This function can recover failed RAID disk volumes from the “Inactive” status to the
normal state (RAID 1, RAID 5, RAID 6 and RAID 10 will be recovered to the degraded
mode; RAID 0 and JBOD will be recovered to the normal state.) Before recovering a failed
disk volume, please confirm that all hard disks of that disk volume are properly seated in
the NAS drive bays. Once recovery is completed, back up your data on the disk(s)
immediately in case the disk volume fails again.
Inactive RAID disk volumes can be recovered only if the minimal number of healthy disks
required for the RAID configuration is available on the NAS. For example, in a RAID 5
configuration with three hard disks in the array, at least two healthy hard disk drives are
required available in the NAS for volume recovery. If not, this RAID volume cannot be
recovered. Refer to the following table for the minimal number of hard disks required to
recover each RAID group:
RAID group
Minimal number of hard disks required for recovery
RAID 1
1
RAID 5
2
RAID 6
2
RAID 10
2
Follow the steps below to recover a failed RAID group:
1. Select a failed RAID group.