Bill Davidsen wrote:
mark delfman wrote:
Hi... I am wondering if anyone can offer some advice on MD performance
related to CPU (speed and or cores).
You didn't ask: if you use ext[34] filesystems, there is a gain to be
had from tuning the stripe and stride parameters, at least for large
sequential io. My measurements were on 2.6.26, so are out of date, but
less head motion is always better.
An external journal can be a huge win for ext3 if you are doing lots of
file creates/deletes. (Striped raid, i.e. raid0/raid5/raid6/raid10
doesn't help the journal much as it is used sequentially. In my tests
putting the journal on a raid1 and the rest of the fs on a raid10 makes
things go much faster. If you have enough disks of course :-))
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