57
This function can reduce the rebuilding duration after a crash, or time length required
to remove/re-add a hard disk. This feature does not improve the disk read/write
performance and might even cause a small degradation in performance. 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, select a RAID group and click "Manage" > "Enable Bitmap"
and then "OK". To disable a bitmap, select a RAID group and click "Manage" > "Disable
Bitmap" (only available after a bitmap has been enabled) and then "OK".
Note :
The bitmap support is only available for RAID 1, RAID 5, RAID 6 and RAID 10.
R e cove ring Fa ile d R AID Disk Volume s
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
M inim a l num be r of ha rd dis ks re quire d for re c ov e ry
RAID 1
1
RAID 5
2
RAID 6
2
RAID 10
2
Follow the steps below to recover a failed RAID group:
Содержание TS-1079 Pro
Страница 187: ...187 Delete Delete the selected Time Machine backup ...
Страница 216: ...216 Note The RADIUS server only supports PAP EAP TLS PAP and EAP TTLS PAP authentication for local NAS user accounts ...
Страница 221: ...221 server For detail please refer to the chapter on DHCP Server 91 ...
Страница 253: ...253 ...
Страница 307: ...307 Vol1 Unmounted The disk volume 1 is unmounted Vol1 Nonactivate The disk volume 1 is inactive ...
Страница 321: ...321 ...