Re: Linux MD RAID 5 Benchmarks Across (3 to 10) 300 GigabyteVeliciraptors

[Justin Piszcz]

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.

Justin.
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