Messages in this thread | | | Date | Thu, 29 May 2008 12:22:23 +0100 | From | Alan Cox <> | Subject | Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++) |
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> I really don't think that's any part of the issue, the same memory and > bridge went 4-5x faster in other read cases. The truth is that the > raid-1 performance is really bad, and it's the code causing it AFAIK. If > you track the actual io it seems to read one drive at a time, in order, > without overlap.
Make sure the readahead is set to be a fair bit over the stripe size if you are doing bulk data tests for a single file. (Or indeed in the real world for that specific case ;))
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