Chapter 9. Raid Recovery - QNAP TS-231+ Hardware User Manual

Chapter 9. RAID Recovery
The QNAP NAS supports RAID recovery when a healthy drive is unexpectedly removed from
a RAID or JBOD configuration. Even if a healthy drive is removed from a degraded RAID
1/5/6 configuration while attempting to hot-swap a faulty drive, the user can reinsert the
drive back into its original position to recover the RAID. RAID recovery is also supported
when a healthy drive is unexpectedly removed from a RAID 0/JBOD configuration. Note
that RAID 10 does not support this feature.
When a healthy drive is unexpectedly removed from a RAID group, the status of the RAID
will change to "Not active". To recover from a "Not active" status:
1. Re-insert all hard drives back into the NAS in its original order. This includes any bad
drive(s) that will need to be replaced after recovery.
2. Log into QTS as administrator and go to "Control Panel" > "Storage Manager" >
"Storage Space".
3. Double click on the affected Storage Pool to open the Storage Pool Management
window.
4. In the "Storage Pool Management" window, click on the "Manage" button and select
"Recover".
The process will take approximately 60 seconds to complete. When recovery is completed,
the RAID group should be restored to its initial status.
See chart below for RAID status during this process.
RAID 0/JBOD
RAID 1/5/6
RAID 1/5/6 Degraded
The chart below describes the events of an error when using RAID 5.
Initial Status After Healthy
Status Drive is Removed
Ready
Ready
RAID 5 (Minimum 3 Disks)
QTS
Not active
Degraded
Not active
109
Status After Drive is
Re-Inserted and Storage
Pool is Recovered
Ready
Rebuilding
Degraded
Standard