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4.
Select the hard disk drive(s) to be configured as spare drive and click "Apply".
5.
Please note that all data on the selected hard disk drive(s) will be erased. Click "Yes" if
you are certain about this.
6.
The chosen disk drives are added as spare drive.
Enabling/Disabling Bitmap
This function can reduce the rebuild time after a crash, or the time length required to
remove/re-add a hard disk. This feature does not improve disk read/write performance and
may even cause slight performance degradation. However, if an array has a bitmap, a hard
disk can be removed and re-added, and only changes in blocks need to be made since the
removal (as recorded in the bitmap) can be re-synced. To enable a bitmap, follow these
steps:
1.
Go to "Storage Manager" > "STORAGE" > "Storage Space".
2.
Double click a storage pool to bring up the Storage Pool Management page.
3.
Select a RAID group and click "Manage" > "Enable Bitmap" and then "OK".
To disable a bitmap,
1.
Go to "Storage Manager" > "STORAGE" > "Storage Space".
2.
Double click a storage pool to bring up the Storage Pool Management page.
3.
Select a RAID group and click "Manage" > "Disable Bitmap" (only available after a bitmap
has been enabled) and then "OK".
Note:
Bitmap support is only available for RAID 1, RAID 5, RAID 6 and RAID 10.
Recovering Failed RAID Disk Volumes
This can recover failed RAID disk volumes from the "Inactive" status to a 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, immediately back up your data on the disk(s) in case the disk
volume fails again.
Inactive RAID disk volumes can only be recovered 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 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 a RAID
group: