Explain difference in SQLIO numbers for RAID 0 versus RAID 5 over 6 disks

Posted by markn on Stack Overflow See other posts from Stack Overflow or by markn
Published on 2009-05-13T19:36:45Z Indexed on 2010/04/04 10:03 UTC
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Performance

When using the SQLIO benchmark tool on a 4-core Dell server with 6 15k 450GB (fast) drives, RAID 0, we found the max throughput was 2MB per second. But when configured as RAID 5, we get 30 MB per second.

It seems that the RAID controller, Dell Perc 5i integrated controller, is maxing out the throughput per disk. With RAID 5, I expect to get a bump due to stripping, but not a 15x difference.

Like good programmers, we suspect the hardware , but we could be missing something.

This is predominately write traffic.

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