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Need help with my writing homework on Raid Technology. Write a 1500 word paper answering;
Need help with my writing homework on Raid Technology. Write a 1500 word paper answering; When more disks are used in the array it implies that it has higher bandwidth, but greater risk of losing data.
RAID 1: This is the level of mirroring without parity or striping, where data is written identically to multiple disks. Many implementations create sets of two disks but some sets may contain three or more disks. The array provides fault tolerance from disk failures and it functions when at least one of drives is functioning. It has the key weakness which is high-cost overhead. this is because data is duplicated as required by storage capacity.
RAID 2: it is the level with bit striping that has dedicated Hamming-code parity, in this level, there is a synchronized rotation of disks and data is striped such that each sequential bit is on it is own disk (Hennessy and Patterson, 2009). When Hamming-code parity is calculated across the subsequent bits on disks it is then stored on the parity disks available.
RAID 3: it is a byte-level striping that has dedicated parity, disks spindle rotate in a synchronized manner and data is striped in such a way that all the subsequent bytes are stored on different disks. Dedicated parity disk is used to store the parity after it has been calculated across the corresponding bytes on disks.
RAID 4: it a striping block level that has dedicated parity, in this architecture all parity data is confined to a single disk which can lower its performance. In this arrangement, there is a spread of files between many disks. The disks in this array have independent operations allowing I/O requests to be done in a similar way, though the drawback is that data transfer speeds suffer as a result of the type of parity being used.
RAID 5: it is a level of block striping whose parity is distributed. Data is distributed along with the parity and drives are required to be present in order for it to operate implying that if a failure occurs then it will have to .be replaced, however, an array is not destroyed when a single drive fails. .
