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To create a RAID select units, then from List Box select what type of RAID it will be,
then select desired Chunk size. After setting all demanded parameters press Create
button.
Allow to create degraded mode
It allows creating RAID1 with one unit, RAID5 with two units or RAID6 with three
units, even if minimal number of units is not meet.
Chunk size - its a minimal portion of data that is written at a time.
Available RAIDS:
RAID 0: it is stripe array and requires [minimum] 2 units. In RAID 0 you can set the
Chunk size 4k ÷ 256k. The destination size of the RAID Array will be the sum of each
drive size in array.
RAID 1: mirror array requires 2 units. Destination size will be equal: SINGLE)
UNIT_SIZE, where (SINGLE) UNIT_SIZE is the size of the smallest unit in array.
RAID 5: parity algorithm array (required [minimum] 3 units - with the same
capacity). You can choose from the List Boxes: (layout) parity-algorithm [left/right]
[symmetric/asymmetric].
DESTINATION
SIZE:
(NR_OF_UNITS-
1)*(SINGLE)UNIT_SIZE, where (SINGLE) UNIT_SIZE is the size of the smallest
unit in array.
The (layout) parity-algorithm in RAID 5 is described below.
RAID 5 (layout) parity-algorithm
It is possible to set one of four algorithms of placement data blocks and parity blocks
in matrix. Our default option is left symmetric, which is the best for large reads. Other
recommended value is left asymmetric.