Contemporary disc systems of RAID
Consequently, the performance record to RAID-5 involves two disks, and each must
comply with the additional traffic. In other words, while writing takes four
treatment: reading, which takes place after recording data, and reading, which
takes place after recording Hog. In case of refusal disc made reading all the
healthy discs for all segments of the so-Xor calculated data restored. Since
almost all requests relate to the same segment, each of the disks in the array
able to perform at the same time different requests. Operation records require
treatment to the two discs, but the remaining two are free to drive execution of
other requests. Since Hog-segmenty distributed across an array of disks, is it
possible to perform at the same time and record. This scheme provides a good
yield for a large number of requests for small and medium-sized. RAID-5 provides
a good data integrity, as data loss occurs only in the event that the second
disc refuses before first refused to be replaced. Productivity RAID-5 assessed
as average. "Hot spots" are, but additional requests for internal record reduce
overall productivity.
Other levels.
Several hybrid levels, including 6, 7, 30 and 50, combine opportunities (for
example, rotating and mirror) of two or more levels above. Level 2, for the
implementation of which requires special drives are no longer in use.
Next part
|
O
wlCom Software
