Datoptic ARC-1680 Series Instrukcja Użytkownika Pobierz pdf (Strona 180)

APPENDIX

180

RAID 6

RAID 6 provides the highest reliability. It is similar to RAID 5, but

it performs two different parity computations or the same compu-

tation on overlapping subsets of the data. RAID 6 can offer fault

tolerance greater than RAID 1 or RAID 5 but only consumes the

capacity of 2 disk drives for distributed parity data. RAID 6 is an

extension of RAID 5 but uses a second, independent distributed

parity scheme. Data is striped on a block level across a set of

drives, and then a second set of parity is calculated and written

across all of the drives.

RAID x0

RAID level-x0 refers to RAID level 30, 50 and 60. RAID x0 is a

combination multiple RAID x volume sets with RAID 0 (striping).

Striping helps to increase capacity and performance without add-

ing disks to each RAID x array. The operating system uses the

spanned volume in the same way as a regular volume. Up to one

drive in each sub-volume (RAID 3 or 5) may fail without loss of

data. Up to two drives in each sub-volume (RAID 6) may fail with-

out loss of data.

RAID level x0 allows more physical drives in an array. The ben-

ets of doing so are larger volume sets, increased performance,

and increased reliability.

The following illustration is an example of a RAID level x0 logical

drive.

1 2 ... 175 176 177 178 179 180 181 182 183 184

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