User manual

52
You can add a spare drive to or remove a spare drive from a RAID 5, 6, or 10
configuration.
Follow the steps below to use this feature.
1. Make sure the status of the RAID 5, 6, 10 configuration is "Ready".
2. Install a hard drive on the NAS. If you have a hard drive which has already been
formatted as single disk volume on the NAS, you can configure this hard drive as
the spare drive. You are recommended to use hard disk drives of the same storage
capacity for the RAID configuration.
3. Select the RAID volume and click "Configure Spare Drive."
4. To add a spare drive to the selected configuration, select the hard drive and click
"Configure Spare Drive." To remove a spare drive, unselect the spare drive and click
"Configure Spare Drive."
5. All the data on the selected hard drive will be deleted. Click "OK" to proceed.
The original data on the RAID 5, 6, or 10 disk volume will be retained. After the
configuration completes, the status of the disk volume will become "Ready".
Note: A hot spare drive must be removed from the disk volume before executing the
following action:
Online RAID capacity expansion
Online RAID level migration
Adding a hard drive member to a RAID 5, RAID 6 or RAID 10 volume
Bitmap
Bitmap improves the time for RAID rebuilding after an unexpected error, or removing or
re-adding a member hard drive of the RAID configuration. If an array has a bitmap, the
member hard drive can be removed and re-added and only blocks changes since the
removal (as recorded in the bitmap) will be re-synchronized. To use this feature, select a
RAID volume and click "Action" > "Enable Bitmap".
Note: Bitmap support is only available for RAID 1, 5, 6, and 10.
RAID Recovery
RAID Recovery: When the NAS is configured as RAID 1, RAID 5, or RAID 6 and any