> Hardware:
>
> 1. Utilized (6) 400 gigabyte sata hard drives.
> 2. Everything is on PCI-e (965 chipset & a 2port sata card)
>
> Used the following 'optimizations' for all tests.
>
> # Set read-ahead.
> echo "Setting read-ahead to 64 MiB for /dev/md3"
> blockdev --setra 65536 /dev/md3
>
> # Set stripe-cache_size for RAID5.
> echo "Setting stripe_cache_size to 16 MiB for /dev/md3"
> echo 16384 > /sys/block/md3/md/stripe_cache_size
>
> # Disable NCQ on all disks.
> echo "Disabling NCQ on all disks..."
> for i in $DISKS
> do
> echo "Disabling NCQ on $i"
> echo 1 > /sys/block/"$i"/device/queue_depth
> done
>
> Software:
>
> Kernel: 2.6.23.1 x86_64
> Filesystem: XFS
> Mount options: defaults,noatime
>
> Results:
>
>
http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.html
>
http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.txt
>
> Note: 'deg' means degraded and the number after is the number of disks
> failed, I did not test degraded raid10 because there are many ways you can
> degrade a raid10; however, the 3 types of raid10 were benchmarked
> f2,n2,o2.
>
> Each test was run 3 times and averaged--FYI.
>
> Justin.
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