Re: Linux Software RAID 5 + XFS Multi-Benchmarks / 10 Raptors Again

[Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>]

On Wed, 16 Jan 2008, Greg Cormier wrote:

> What sort of tools are you using to get these benchmarks, and can I
> used them for ext3?
>
> Very interested in running this on my server.
>
>
> Thanks,
> Greg
You can use whatever suits you, such as untar kernel source tree, copy files, 
untar backups, etc--, you should benchmark specifically what *your* workload is.

Here is the skeleton, using bash:: (don't forget to turn off the cron 
daemon)
for i in 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768 65536
do
  cd /
  umount /r1
  mdadm -S /dev/md3
  mdadm --create --assume-clean --verbose /dev/md3 --level=5 --raid-devices=10 
--chunk=$i --run /dev/sd[c-l]1

  /etc/init.d/oraid.sh # to optimize my raid stuff

  mkfs.xfs -f /dev/md3
  mount /dev/md3 /r1 -o logbufs=8,logbsize=262144

  # then simply add what you do often here
  # everyone's workload is different
  /usr/bin/time -f %E -o ~/$i=chunk.txt bash -c 'dd if=/dev/zero of=/r1/bigfile 
bs=1M count=10240; sync'
done

Then just, grep : /root/*chunk* | sort -n to get the results in the same format.

Justin.