On Wed, 11 Jun 2008, Justin Piszcz wrote:
On Wed, 11 Jun 2008, Bill Davidsen wrote:
Justin Piszcz wrote:
First, the original benchmarks with 6-SATA drives with fixed formatting,
using
right justification and the same decimal point precision throughout:
http://home.comcast.net/~jpiszcz/20080607/raid-benchmarks-decimal-fix-and-right-justified/disks.html
Now for for veliciraptors! Ever wonder what kind of speed is possible with
3 disk, 4,5,6,7,8,9,10-disk RAID5s? I ran a loop to find out, each run is
executed three times and the average is taken of all three runs per each
RAID5 disk set.
In short? The 965 no longer does justice with faster drives, a new chipset
and motherboard are needed. After reading or writing to 4-5 veliciraptors
it saturates the bus/965 chipset.
This is very interesting, but a 16GB chunk size bears no relationship to
anything I would run in the real world, and I suspect most people are in
the same category.
I based my bonnie++ test on:
http://everything2.org/?node_id=1479435
So I could compare to his results.
I use a 1024k (1MiB) with 16384 stripe, this offered the best overall
read/write/rewrite performance AFAIK.
1024k chunk size (raid5 chunk size)
echo 16384 > stripe_cache_size
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