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Random Read & Write Patterns

Now we’ll see the dependence between the arrays’ performance in random read and write modes and the data chunk size.

The arrays all deliver similar performance when reading small-size data chunks. The single disk and the two-disk RAID1 are somewhat faster than the others. The different array types begin to differ in performance as the data chunk size grows larger. Generally speaking, arrays with more disks are somewhat faster. The amount of disks being equal, RAID0 is the fastest array type. RAID5 is second best, followed by the mirrored arrays. The RAID10 breaks this rule, having a performance boost at 2MB data chunks.

It’s simpler with writing because the standings of the arrays do not differ throughout the test. As could be expected, the RAID5 arrays have the lowest speeds of writing. The RAID1 has a higher speed yet it is anyway slower than the single disk. The RAID10 is better, and the RAID0 arrays are better yet, ranked according to the number of disks per array.

 
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