Vivotek ND9541P User Manual page 141

4. RAID5: A RAID5 volume provides a balance in performance and good fault tolerance. RAID5
stripes data and also generates error correction information (parity bits). One drive's capacity
is needed to store the error correction information from all member drives. A RAID5 volume
requires at least 3 disk drives.
Note that if a member drive fails, the rebuild process of a RAID5 volume can take about
several days to complete (using 2TB drive members). The rebuild runs in the background,
and the rebuild progress is indicated on the volume page.
Disk 0 Disk 1
On this configuration window, a "disk" refers to a physical disk drive, a "volume" refers to the
logical configuration of disk drives which may include multiple disk drives.
IMPORTANT:
If you remove a disk drive and insert it into a different drive bay, the system will consider it as a
new and different disk drive.
Some of the RAID levels provide data protection. Below is the summary of RAID level features:
RAID level No. of HDD No. of HDD failure
RAID0 > =
RAID1 2 or 4
RAID5 > =
IMPORTANT:
There are conditions that disk drives will not be available for storage configuration:
1. The disk drives are performing the Verify process.
2. The disk drives considered as "failed" drives by the S.M.A.R.T. self detection.
3. When you create a RAID volume, the disk drives in an external storage enclosure will not be
available.
VIVOTEK - Built with Reliability
G
Disk 2
Allowed
2 0
1 or 2 (if counterparts in
the mirrored pair survives)
3 1
Capacity
HDD # x (smallest HDD size)
HDD # / 2
(HDD # - 1) x (smallest HDD size)
User's Manual - 141