Datoptic RM12-S6.TB - Rackmount Manual de usuario descargar pdf (Pagina 85)

APPENDIX

194

RAID 10(1E)

RAID 10(1E) is a combination of RAID 0 and RAID 1, combining

stripping with disk mirroring. RAID Level 10 combines the fast

performance of Level 0 with the data redundancy of level 1. In

this conguration, data is distributed across several disk drives,

similar to Level 0, which are then duplicated to another set of

drive for data protection. RAID 10 has been traditionally imple-

mented using an even number of disks, some hybrids can use

an odd number of disks as well. Illustration is an example of a

hybrid RAID 10(1E) array comprised of ve disks; A, B, C, D and

E. In this conguration, each strip is mirrored on an adjacent disk

with wrap-around. Areca RAID 10 offers a little more exibility in

choosing the number of disks that can be used to constitute an

array. The number can be even or odd.

RAID 3

RAID 3 provides disk striping and complete data redundancy

though a dedicated parity drive. RAID 3 breaks up data into

smaller blocks, calculates parity by performing an exclusive-or

on the blocks, and then writes the blocks to all but one drive in

the array. The parity data created during the exclusive-or is then

written to the last drive in the array. If a single drive fails, data is

still available by computing the exclusive-or of the contents cor-

responding strips of the surviving member disk. RAID 3 is best

for applications that require very fast data- transfer rates or long

data blocks.

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Datoptic RM12-S6.TB - Rackmount Manual de usuario Pagina 85