Here are my testing scripts used in the performance howto: http://linux-raid.osdl.org/index.php/Home_grown_testing_methods =Hard disk performance scripts= Here are the scripts that I used for my performance measuring. Use at your own risk. They destroy the contents of the partitions involved. The /dev/md raid needs to be stopped before initiating the test. Copyright Keld Simonsen, keld@xxxxxxxx 2008. Licensed under the GPL. iotest: #!/bin/sh # invoked by # iotest "mdadm -R -C /dev/md1 --chunk=256 -l 10 -n 2 -p f2 " /dev/md1 /mnt/md1 ext3 " /dev/hdb5 /dev/hdd5 " echo "\n" $1 $5 "\n" >> /tmp/results echo $1 $5 $1 $5 mkfs -t $4 $2 mkdir $3 mount $2 $3 cd $3 echo "\nmakefiles\n" >> /tmp/results mkfiles 200 echo "\n remakefiles \n" >>/tmp/results mkfiles 200 echo "\n catall \n" >>/tmp/results cat * >/dev/null echo "\n catnull \n" >>/tmp/results catnull cd umount $2 mdadm -S $2 echo "\n finish " $1 " " $5 "\n" >> /tmp/results Be careful with this script, and remember to change the ordinary test to only one partition iorun: #!/bin/sh # set up ram disk DISKS="/dev/sda2 /dev/sdb2" iostat -k 10 > /tmp/results & iotest " " /dev/sda2 /mnt/sda2 ext3 " " iotest "mdadm -C /dev/md1 --chunk=256 -R -l 0 -n 2 " /dev/md1 /mnt/md1 ext3 "$DISKS" iotest "mdadm -C /dev/md1 --chunk=256 -R -l 1 -n 2 " /dev/md1 /mnt/md1 ext3 "$DISKS" iotest "mdadm -C /dev/md1 --chunk=256 -R -l 10 -n 2 " /dev/md1 /mnt/md1 ext3 "$DISKS" iotest "mdadm -C /dev/md1 --chunk=256 -R -l 10 -n 2 -p f2 " /dev/md1 /mnt/md1 ext3 "$DISKS" # iotest "mdadm -C /dev/md1 --chunk=256 -R -l 10 -n 2 -p o2 " /dev/md1 /mnt/md1 ext3 "$DISKS" mkfiles: #!/bin/sh for (( i = 1; i < $1 ; i++ )) ; do dd if=/dev/hda1 of=$i bs=1MB count=40 ; done for (( i = 1; i < $1 ; i++ )) ; do dd if=/dev/hda1 of=$i bs=1MB count=40 & ; done catnull: #!/bin/tcsh foreach i ( * ) cat $i >/dev/null & end wait - 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
