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SubjectRe: I/O issues, iowait problems, 2.4 v 2.6
Paul Venezia <pvenezia@jpj.net> wrote:
>
> On Mon, 2003-11-10 at 23:54, Andrew Morton wrote:
>
> > OK, the IO rates are obviously very poor, and the context switch rate is
> > suspicious as well. Certainly, testing with the single disk would help.
>
> I pulled the secondary, reconfigured to single drives and rebooted. All
> is now well, performance is right where it should be.
>
>
> 0 0 0 1475924 7052 42384 0 0 0 0 1015 6
> 0 0 0 1475284 7076 42360 0 0 0 156 1041 311
> 0 0 0 1475284 7076 42360 0 0 0 0 1016 12
> 0 0 0 1475284 7076 42360 0 0 0 0 1026 30
> 2 0 0 1252628 7300 258852 0 0 8 37240 1157 119
> 0 3 0 1027284 7524 478064 0 0 8 66016 1441 317
> 1 3 0 818132 7728 682948 0 0 4 70752 1439 202
> 1 3 0 593236 7944 901760 0 0 4 64576 1452 92
> 0 4 0 531412 8008 961876 0 0 4 63680 1434 97

OK, so either we broke the driver or there is some tuning sensitivity.

Could you please do:

mkdir /sys
mount none /sys -t sysfs
cd /sys/block/sdXX/queue
echo 512 > nr_requests
and retry the RAID setup?

Beyond that, dunno. We'll need to hunt down the people who worked on that
driver.

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