User manual

92
RAID 5 Disk Volume
The data are striped across all the hard drives
in a RAID 5 array. The parity information is
distributed and stored across each hard drive.
If a member hard drive fails, the array enters
degraded mode. After installing a new hard
drive to replace the failed one, the data can
be rebuilt from other member drives that
contain the parity information.
To create a RAID 5 disk volume, a minimum
of 3 hard drives are required.
The storage capacity of a RAID 5 array is
equal to (N-1) * (size of smallest hard drive).
N is the number of hard drives in the array.
RAID 6 Disk Volume
The data are striped across all the hard drives
in a RAID 6 array. RAID 6 differs from RAID 5
that a second set of parity information is
stored across the member drives in the array.
It tolerates failure of two hard drives.
To create a RAID 6 disk volume, a minimum
of 4 hard drives are required. The storage
capacity of a RAID 6 array is equal to (N-2) *
(size of smallest hard drive). N is the number
of hard drives in the array.
RAID 10 Disk Volume
RAID 10 combines four or more disks in a
way that protects data against loss of non-
adjacent disks. It provides security by
mirroring all data on a secondary set of disks
while using striping across each set of disks to
speed up data transfers.
RAID 10 requires an even number of hard
drives (minimum 4 hard drives). The storage
capacity of RAID 10 disk volume is equal to
(size of the smallest capacity disk in the
array) * N/2. N is the number of hard drives
in the volume.