Re: Poor Software RAID-0 performance with

From: Lars Roland
Date: Tue Nov 22 2005 - 04:45:54 EST

On 11/21/05, Lennart Sorensen <lsorense@xxxxxxxxxxxxxxxxxxx> wrote:
> > dkstorage01:~# hdparm -t /dev/md0
> > /dev/md0:
> > Timing buffered disk reads: 182 MB in 3.01 seconds = 60.47 MB/sec
> >
> > dkstorage02:~# hdparm -t /dev/hdc1
> > /dev/hdc1:
> > Timing buffered disk reads: 184 MB in 3.02 seconds = 60.93 MB/sec
> How about at least testing one of the drives involved in the raid,
> although I assume they are identical in your case given the numbers.

There are four identical drives in the machines although I only stripe
on two of them - I can assure you that I get the same numbers from all
the drives - I should ofcause have put this info in the orig post.

> Did you test this with other kernel versions (older ones) to see if it
> was better in the past?

Also tried 2.4.27 and 2.4.30 - no difference there.
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