User manual

73
RAID 5 Disk Volume
The data are striped across all the HDD in a
RAID 5 array. The parity information is
distributed and stored across each HDD. If a
member HDD fails, the array enters
degraded mode. After installing a new HDD
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 HDD are required.
The storage capacity of a RAID 5 array
equals (N-1). N is the total number of HDD
members in the array.
RAID 6 Disk Volume
The data are striped across all the HDD 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 drives
HDD.
To create a RAID 6 disk volume, a minimum
of 4 hard disks are required. The storage
capacity of a RAID 6 array equals (N-2). N
is the total number of HDD members in the
array.