Re: Low perfomance of RAID0,RAID5, RAID+LVM on 2.6

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On Thu, 19 Aug 2004 14:12:07 -0400
"Rechenberg, Andrew" <ARechenberg@xxxxxxx> wrote:

> In the part of the message that was quoted to the linux-raid list the
> performance of the RAID devices isn't specified.  All I see is you
> testing /dev/sda1 and mentioning kernel modules, but no mention of
> /dev/mdX or /dev/YourVG/YourLV.
It was my reply to answer, tests with md and lvm was in first message
to this linux-raid lisst.

And setting readahead on lvm volumes helpes. Now I get about 80 Mb/s
read on raid5 and about 100Mb/s on raid0, but the cpu overhead was very
high, but acceptable  for me. But it helps only in 2.6.6! 2.6.7 and
2.6.8.1 much slower than 2.6.6.


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