Hello Pascal, Thursday, April 17, 2008, 10:29:33 AM, you wrote:
PV> Hi everyone, PV> I've bought some new hardware a couple of weeks ago to replace my home fileserver: PV> Intel DG33TL motherboard with Intel gigabit nic and ICH9R PV> Intel Pentium Dual E2160 (= 1.8GHz Core 2 Duo 64-bit PV> architecture with less cache, cheap, cool and more than fast enough) PV> 2 x 1 GB DDR2 RAM PV> 3 x Seagate 7200.11 750GB SATA drives PV> Originally I was going to keep running Windows 2003 for a month PV> (to finish migrating some data files to an open-source friendly PV> format) and then move to Solaris, but because the Intel Matrix PV> RAID 5 write speeds were abysmally low no matter which stripe PV> sizes/NTFS allocation unit size I selected, I've already thrown PV> out W2K3 completely in favor of Solaris 10 u5. PV> I have updated the motherboard with the latest Intel BIOS (0413 PV> 3/6/2008). I have loaded "optimal defaults" and have put the SATA drives in AHCI mode. PV> At the moment I'm seeing read speeds of 200MB/s on a ZFS raidz PV> filesystem consisting of c1t0d0s3, c1t1d0 and c1t2d0 (I'm booting PV> from a small 700MB slice on the first sata drive; c1t0d0s3 is PV> about 690 "real" gigabytes large and ZFS just uses the same amount PV> of sectors on the other disks and leaves the rest untouched). As a PV> single drive should top out at about 104MB/s for sequential access PV> in the outer tracks, I'm very pleased with that. PV> But the write speeds I'm getting are still far below my PV> expectations: about 20MB/s (versus 14MB/s in Windows 2003 with PV> Intel RAID driver). I was hoping for at least 100MB/s, maybe even more. PV> I'm doing simple dd read and write tests (with /dev/zero, PV> /dev/null etc) using blocksizes like 16384 and 65536. PV> Shouldn't write speed be substantially higher? If I monitor using PV> "vmstat 1", I see that cpu usage never exceeds 3% during writes (!), and 10% during reads. PV> I'm a Solaris newbie (but with the intention of learning a whole PV> lot), so I may have overlooked something. I also don't really know PV> where to start looking for bottlenecks. Check iostat -xn 1 Also try to lower number of outstanding IOs per device from default 35 in zfs to something much slower. -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
