Greg 'groggy' Lehey wrote:
Single stream tests aren't very good examples for RAID-5, because it
performs writes in two steps: first it reads the old data, then it
writes the new data.
If it really does it this way, instead doing write-only when writing
sufficiently large blocks, that would explain the performance due to
double rotational latency wait for each stripe size. Most
implementations also use read/write caches to optimize this even further.
Pete
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