On Mon, May 24, 2004 at 12:46:53PM +0800, Yusuf Goolamabbas wrote:
> Are the above statements only true for software raid5 or true for all
> software raid levels. Are there any other values appropiate for software
> raid/hardware raid ?
in my understanding the big problem with raid5 is that most controller
have a fix block size, but xfs uses two different bs for logs and data.
Having external logs can alleviate the problem.
On the other side you don't have the same problem with raid1 (please
correct me if I'm wrong).
Googling around it seems that a fixed bs fs ala ext3 can have better
performance that a default xfs on raid5.
However it's still not clear to me how to tweak performance of xfs both
on raid1/5 and avoid these pitfalls. Moreover the xfs website says that
xfs performance on raid are poor and the problem is going to be solved
in the next major release.
does anybody have any pointer to a xfs on raid performance how-to and the
latest news about xfs performance in the development branch ?
++ "All great truths begin as blasphemies." -George Bernard Shaw
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