Messages in this thread | | | Date | Mon, 24 Feb 2003 13:53:23 -0800 | From | Andrew Morton <> | Subject | Re: 2.5.62-mm2 slow file system writes across multiple disks |
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Patrick Mansfield <patmans@us.ibm.com> wrote: > > Hi - > > Running 2.5.62-mm2, I was trying to get multiple commands queued to > different scsi disks via writes to multiple file systems (each fs > on its own disk), but got rather low performance. > > Are there any config options or settings I should change to improve the > performance? > > Is this expected behaviour for now? > > I'm mounting 10 disks using ext2 with noatime, starting 10 dd's in > parallel, with if=/dev/zero bs=128k count=1000, then umount-ing after each > dd completes.
Could be that concurrent umount isn't a good way of getting scalable writeout; I can't say that I've ever looked...
Could you try putting a `sync' in there somewhere?
Or even better, throw away dd and use write-and-fsync from ext3 CVS. Give it the -f flag to force an fsync against each file as it is closed.
http://www.zip.com.au/~akpm/linux/ext3/
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