[mythtv-users] OT Hardware RAID 5 non-Recommendations

David Rees drees76 at gmail.com
Fri Dec 22 03:17:20 UTC 2006

On 12/21/06, John Drescher <drescherjm at gmail.com> wrote:
> > For example, there seems to be a software Raid 5 performance bug which
> > limits write performance to single disk speeds even for large writes:
> > http://thread.gmane.org/gmane.linux.raid/13932/focus=13932
> Thanks for the link. I too have seen this write performance problem.
> On a server at work with a 6 drive software raid 6, I get around
> 267MB/s raw read performance and around 67MB/s write (which is what a
> single drive does) in both cases the cpu usage is less than 10%.

Yeah, unfortunately none of the developers seem to know quite where to
look to fix it. I would expect that your raid 6 write performance is
also being limited by the same issue that is limiting write
performance on software raid 5 arrays.


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