Contemporary disc systems of RAID
Comparing the characteristics of RAID.
We covered the basic configuration RAID- arrays. Choosing the required
configuration taking into account the characteristics and needs of the
architecture of applications that these arrays will be used. This would take
into account not only the technical characteristics (performance, reliability),
but other requirements that may make the user. Depending on the requirements of
the system can be characterized by three groups of users. For the first group
the most important characteristic is the cost. By the next group of users, for
whom the more important reliability. For the third group is the dominant
characteristic performance. Most users fell in the middle of "the triangle. For
example, choosing a higher reliability of the device, the user will necessarily
take into account both the value and productivity. Cost. The cost of RAID-0 is
just the cost of four sinks. RAID-3 and RAID-5 require an additional drive to
provide redundancy and thus their value in the four drives at 25% above RAID-6
requires a two-disc surplus value rises by 50%. And finally, RAID-1 most
expensive, it cost twice the value RAID- O. Reliability. Reliability RAID-
devices defined organization array disks and power used mechanism for the
protection of errors.
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