User Manual

14BChapter 15: Storage management
TruVision NVR 71 User Manual 103
RAID level Number of
HDDs
What it does Recovery in case of a HDD failure
on one disk and the corresponding
data will be on the other disk for the
same position.
When one HDD fails, the data can be
restored via the parity information on
the other disks. Replace the failed
HDD and manually restart the rebuild
process. To do this, select the new
hard drive and click the Rebuild
button.
6 Minimum 4 RAID6 is almost the same as RAID5,
but there are two parity blocks per
disk. This allows a quicker rebuild
process than RAID 5.
In a RAID 6 setup, two HDDs can fail,
but still the data will be OK.
When a HDD fails, the data can be
restored via the parity information of
the other disks. Replace the failed
HDD and manually restart the rebuild
process. To do this, select the new
HDD and click the Rebuild button.
10 Minimum 4 It is the same as RAID 0 but in
combination with RAID 1 (data
mirroring)
Replace the failed HDD and manually
restart the rebuild process.
Automatic rebuild
You can also automatically rebuild RAID 1, 5, 6, and 10.
To automatically rebuild, add an extra drive in the recorder that is not assigned to the RAID
array. Configure this HDD as a backup disk (hot-spare disk). To do this, select this extra disk in
the RAID settings and click the SET button.
Figure 23: RAID Set button
Whenever a HDD fails in the RAID array, the backup/hot-spare disk will be automatically used
to rebuild the array.
You can then replace the faulty hard disk and configure that new disk as the hot-spare/backup
disk.
Create a RAID array
To create a RAID array:
1. From the menu toolbar, click Configuration > Storage Management > RAID Settings.
2. Click the Enable RAID checkbox.
The system will automatically reboot.