Messages in this thread | | | Date | Wed, 18 Jul 2007 06:28:46 -0400 (EDT) | From | Justin Piszcz <> | Subject | Re: Slow Soft-RAID 5 performance |
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On Wed, 18 Jul 2007, Rui Santos wrote:
> Hi, > > I'm getting a strange slow performance behavior on a recently installed > Server. Here are the details: > > Server: Asus AS-TS500-E4A > Board: Asus DSBV-D ( > http://uk.asus.com/products.aspx?l1=9&l2=39&l3=299&l4=0&model=1210&modelmenu=2 > ) > Hard Drives: 3x Seagate ST3400620AS ( > http://www.seagate.com/ww/v/index.jsp?vgnextoid=8eff99f4fa74c010VgnVCM100000dd04090aRCRD&locale=en-US > ) > I'm using the AHCI driver, although with ata_piix, the behavior is the > same. Here's some info about the AHCI controler: >
With three disks, if everything was perfect yeah 120MB/s writes. When I had started out with 4 raptors I was getting 164MB/s read and write. By default with no optimizations you will not get good speed.
With no optimizations with 10 raptors I get 180-200MB/s, with optimizations, 464MB/s write and 622MB/s read.
1. Use XFS if you wan't speed. 2. Use 128k, 256k or 1MiB chunk size. 3. Use 8192k, 16384k stripe_cache_size. 4. Use 65536 readahead size.
These are only some of the optimizations I use.
Justin.
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