Justin Piszcz wrote: > > > 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. Thank you for your reply. I've used: 1) xfs, 2) 256k, 3) 16384k and 4) 65536 readahead. Also tryed ext3 with --stride option. The speed is just a bit slower... I can get ~100MB/sec. The hardware is capable of doing better tough... Thanks for your help. > > Justin. Rui Santos > > > > - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
