Datoptic uNAS – tNAS Bedienungsanleitung Seite 28

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uNAS/tNASUserGuideVersion1.0 Page28
- 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: stripe + parity algorithm array (required [minimum] 3 units - with the same capacity).
You can choose from the ListBoxes: (layout) parityalgorithm [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-algorithms
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.
Software RAID 5 is not a good choice for writing a lot of very small files!
RAID6: stripe + parity algorithm array (required, minimum 4 units - with the same capacity).
You can choose from the ListBoxes: (layout)parityalgorithm [left/right] [symmetric/asymmetric].
DESTINATION SIZE: (NR_OF_UNITS-2)*(SINGLE)UNIT_SIZE, where (SINGLE) UNIT_SIZE
is the size of the smallest unit in array.
The (layout) parity-algorithm in RAID 6 is described below.
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