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Re: Help with low raid5 performance
On Nov 9, 2010, at 7:38 AM, Peter Kerwien wrote:
> But cannot understand what I'm doing wrong. I'm experimenting with 3 x WD
> 500GB RE2 drives, which give approx. 55-60MB/s when using them as separate
> disks (measured with iostat during a file copy to the drive). But when
> setting up a RAID-5 configuration with all three drives, I'm seeing something
> between 10-20 MB/s. Never above 20MB/s.
[ ... ]
> What important thing have I missed or done wrong??
You're expecting RAID-5 to perform better than a bare drive. See:
...for the tradeoffs between performance, reliability, and cost.
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