Appendix A: Optimizing RAID 5 Write Performance

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.

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