On Fri, Feb 15, 2008 at 12:30 AM, Bob Friesenhahn <[EMAIL PROTECTED]> wrote: > Under Solaris 10 on a 4 core Sun Ultra 40 with 20GB RAM, I am setting > up a Sun StorageTek 2540 with 12 300GB 15K RPM SAS drives and > connected via load-shared 4Gbit FC links. This week I have tried many > different configurations, using firmware managed RAID, ZFS managed > RAID, and with the controller cache enabled or disabled. > > My objective is to obtain the best single-file write performance. > Unfortunately, I am hitting some sort of write bottleneck and I am not > sure how to solve it. I was hoping for a write speed of 300MB/second. > With ZFS on top of a firmware managed RAID 0 across all 12 drives, I > hit a peak of 200MB/second. With each drive exported as a LUN and a > ZFS pool of 6 pairs, I see a write rate of 154MB/second. The number > of drives used has not had much effect on write rate.
May not be relevant, but still worth checking - I have a 2530 (which ought to be that same only SAS instead of FC), and got fairly poor performance at first. Things improved significantly when I got the LUNs properly balanced across the controllers. -- -Peter Tribble http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
