Messages in this thread | | | Date | Wed, 11 Jun 2008 16:53:14 -0400 (EDT) | From | Justin Piszcz <> | Subject | Re: Linux MD RAID 5 Benchmarks Across (3 to 10) 300 Gigabyte Veliciraptors |
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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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