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Appendix A: Optimizing RAID 5 Write Performance
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of the drives in the array. This increases both the rebuild speed and the speed
of access to missing data, which also has to be recreated from the remaining
drives.
Summary
In summary, for maximum performance using RAID 5, we recommend that you
use four or five drives in a sub-array. If there are more than five drives in a
sub-array, it is better to use a smaller chunk size, say 64 K or 128 K, as this will
lead to more Full Stripe Writes.