Memory for disk arrays
When you create a RAID-0 array-level information is divided into blocks that
records are assessed on individual disks, that is, a system with parallel access
(if, a co-pro, it allows the block size). Thanks to the simultaneous I / O with
no several disks RAID 0 provides the maximum data transfer speed and maximum
efficiency in the use of disk space, as it does not require space for the
storage of control amounts. For example, studies indicate that, compared with
one floppy drive, RAID-0 array of two drives gave increase speed write at 143%.
/ read by 96% of the three drives This level is very simple. Basically RAID 0 is
used in areas where rapid transfer of large volumes of data. Advantages: -- the
highest performance for applications requiring intensive processing of requests
I / O and large volume data; -- All HD space being used (no redundancy); -- easy
implementation; -- low cost per unit volume. Disadvantages: -- not robust
solution; -- Rejection of one disk entails the loss of all data array. RAID 1
disk array with overlapping (or mirroring - mirroring) i. RAID Level 1 - is an
array of disks with 100 - percent redundancy. That is simply data while fully
duplicated , which is achieved at the expense of a very high degree of
reliability (as, indeed, and value). To implement Level 1 does not require pre-split
disks and data on the blocks. In the simplest case, two drives contain identical
information, and are a logical distribution com When failure of the same disk
it performs other functions. In addition, this level of doubling their speed
readers, as this operation can be performed simultaneously with two disks. Such
information storage scheme is used mainly in cases where the price is much
higher safety data storage system implementation cost.
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