From: heupink, mourik jan (heupink_at_merit.unu.edu)
Date: Thu Dec 06 2007 - 13:48:42 CET
Date: Thu, 6 Dec 2007 13:48:42 +0100 From: "heupink, mourik jan" <heupink@merit.unu.edu> Message-ID: <25276735.89991196945322063.JavaMail.root@intech007.intech.unu.edu> Subject: RE: [suse-sles-e] Very high MD latencies with SLES10 SP1.
Hi all,
> On Wed, 5 Dec 2007, Norbert Paschedag wrote:
>
> > The sd devices alone show normal timings, it seems the MD device that's
> > causing these latencies. Any idea which parameter to change here ? Any
> > caveats regarding MD RAID1 that I missed ?
I'm not sure if it's related, (probably not, but who knows..? But it never hurts to tell the list about it)
I recently installed a sles10sp1 software raid5 system, with 4*500 gig disks on one controller. It took over 700 seconds to complete a certain disk subsys benchmark (the disktest tool from scalix). This is _very_ long. (all installation settings were default, except runlevel 3 instead of 5)
Then I installed sles9sp3, again software raid5, same machine, same hardware, default install, runlevel 3, and that installation completed the same benchmark in under 50 seconds.
The difference is that major, that I probably have some kind of hardware incompatibility or so, because even IF there are problems concerning software raid on sles10sp1, I can hardly believe that the difference would be this big...
Regards,
Mourik Jan
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