Memory for disk arrays
If reading the recorded call 1100100, the checklist call for him just 101.
Comparing the original checklist obtained from the floor (porazryadnaya
exclusive OR 101 = 011, then there is an error reading in operation), we have:
110 the third position. Accordingly, knowing what bits is erroneous, it is easy
to correct the "raid". In addition, the code allows us not only to correct "raid
" single mistake, but also found double-vat. In doing so, he is the oversupply
of all levels with correction codes. This mosaic-small data storage is used
rarely, because bad cope with a large number of request-related, difficult to
organize and has little advantage over RAID level 3. Advantages: -- rapid
correction of errors ( "on the fly"); -- very high speed transmission of large
amounts of data; -- while increasing the number of disks, reduced overhead; --
rather simple realization. Disadvantages: -- high cost, low number of drive; --
Resiliency lower than that of RAID 1; -- slow processing of requests (not
suitable for systems-oriented transaction processing). i. RAID 3 - tolerant
array with parallel data transfer and even incumbent (Parallel Transfer Disks
with Parity) RAID Level 3 - a fault with an array of parallel-input withdrawal
and an additional disk drive on which information is recorded checklist.
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