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@dkuug.dk 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