On Wed, 15 Nov 2006, Magnus Naeslund(k) wrote: > # cat /proc/mdstat > Personalities : [raid1] > md2 : active raid1 sda3[0] sdb3[1] > 236725696 blocks [2/2] [UU] > > md1 : active raid1 sda2[0] sdb2[1] > 4192896 blocks [2/2] [UU] > > md0 : active raid1 sda1[0] sdb1[1] > 4192832 blocks [2/2] [UU] i see you have split /var and / on the same spindle... if your /home is on / then you're causing extra seek action by having two active filesystems on the same spindles. another option to consider is to make / small and mostly read-only and move /home to /var/home (and use a symlink or mount --bind to place it at /home). or just put everything in one big / filesystem. hopefully your swap isn't being used much anyhow. try "iostat -kx /dev/sd* 5" and see if the split is causing you troubles -- i/o activity on more than one partition at once. > I've tried to modify the queuing by doing this, to disable the write cache and enable CFQ. The CFQ choice is rather random. > > for disk in sda sdb; do > blktool /dev/$disk wcache off > hdparm -q -W 0 /dev/$disk turning off write caching is a recipe for disasterous performance on most ata disks... unfortunately. better to buy a UPS and set up nut or apcupsd or something to handle shutdown. or just take your chances. -dean - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
