Rocstor GUARDIAN 4RT, Руководство по установке и настройке

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ROCSECURE – Guardian 4RT Secure Raid System User Manual Page | 105
Definition of RAID Levels
RAID 0 is typically defined as a group of striped disk drives without parity or data
redundancy. RAID 0 arrays can be configured with large stripes for multi-user environments
or small stripes for single-user systems that access long sequential records. RAID 0 arrays
deliver the best data storage efficiency and performance of any array type. The
disadvantage is that if one drive in a RAID 0 array fails, the entire array fails.
RAID 1 , also known as disk mirroring, is simply a pair of disk drives that store duplicate data
but appear to the computer as a single drive. Although striping is not used within a single
mirrored drive pair, multiple RAID 1 arrays can be striped together to create a single large
array consisting of pairs of mirrored drives. All writes must go to both drives of a mirrored
pair so that the information on the drives is kept identical. However, each individual drive
can perform simultaneous, independent read operations. Mirroring thus doubles the read
performance of a single non-mirrored drive while the write performance is unchanged.
RAID 1 delivers the best performance of any redundant array type. In addition, there is less
performance degradation during drive failure than in RAID 5 arrays.