Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 10 Nov 2003 21:50:49 -0800 | From | Andrew Morton <> | Subject | Re: I/O issues, iowait problems, 2.4 v 2.6 |
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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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