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With a four disk RAID 5 array, ATTO shows us:
No sign of problems with 4 disks in the RAID 5 set, and surprisingly, write performance is consistently better than read performance for larger requests. Let’s see what HDTach has to say about the 4 disk RAID 5 set:
Performance is much more predictable - no peaks or troughs and performance is still right up there. HDTune then, to see the difference between sequential and random access:
Again, there are a couple of small inconsistencies in the data. Random IO results:
Unchanged.
