WorkStation Care

It is combination of RAID 1 & 0. These types of combination of level are called Nested Levels. It requires minimum 4 disksto implement. It needs both Stripping & Mirroring but without Parity. Advantage: Good performance & high reliability. Disadvantage: Redundancy means it is expensive.

RAID 6 is extension of RAID 5. It extend RAID 5 by adding an additional parity block, thus using block level stripping with 2 parity blocks distributed across all member disks. It requires atleast 4 disks. Advantages: It can handle failure of two disks in the array. Good read performance as data is speed over multiple disk. Disadventage: High cost.

Raid 5 uses stripping with parity. It break bottle neck. It require atleast 3 disks & usually 5 dist of array. Advantage: Best combination of performance , redundancy, storage efficiency. Good for multi-user system in which performance is most critical. Disadvantage: It is difficult to recover in the event of disk failure because of disturbed nature of parity.

RAID 4 is almost similar to RAID 3 level, except with difference. the difference is that RAID 3 level Stripes data one byte at a time, where as RAID 4 level stripes data in blocks. It have bottle neck.

This specifies data stripping (at byte level) with a decided parity disk. this means RAID 3 level generates parity & dedicated one of its Disk drive for storing the parity information. The implementation of RAID 3 level requires atleast three Disks.

This specifies mirroring but without any parity . This means that the data is copied into multiple disks but there is no error correction. The implementation of RAID 1 level, like RAID 0 level, also requires at least two disks.

This specifies data stripping but without any parity. This means that the data is split into several smaller parts without any duplication & stored in multiple disks, but there is no error correction. The implementation of RAID 0 level requires atleast two disks. RAID 0 level provides good performance over single disk storage.