Memory for disk arrays
Disadvantages: -- speed reading of data is lower than in RAID 4; -- slow read /
write data in a small amount of single queries. Use: arrays of reliable high
volume. The implementation requires a significant governmental costs. This level
is most prevalent in cases where required sufficiently high speed transfer of
large quantities of data files small volume. The minimum number of drives in a
RAID 5 array 3 pc. i. RAID 6 - tolerant array of independent disks with two
world-independent distributed parity scheme (Independent Data Disks with Two In-dependent
Distributed Parity Schemes) The data are broken down into block level similar to
RAID 5, but in addition to the previous architecture Two scheme for improving
reliability. This architecture is a sustained bounce to double. However, in
carrying out the logical record six hits really happening to the disk, which
greatly increases the processing time per request. A more complex circuit, even
to the steady double bounce (but at the cost of lower productivity of).
. RAID-array level 6 Advantages: -- high fault tolerance; -- sufficiently high
speed query processing; -- relatively small overhead costs for the
implementation of redundancy. Disadvantages: -- implementation of a very complex;
-- complex data recovery; -- very low speed data recording. Technology RAID 3,
RAID 4, and RAID 6 represent a combination of the second and fifth levels, their
characteristics are the procedures for calculating the amounts of control in
parallel with the transfer of data, as well as the existence of two independent
algorithms for calculating control amounts.
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