On Fri, Jun 18, 2010 at 04:52:02AM -0400, Curtis E. Combs Jr. wrote: > I am new to zfs, so I am still learning. I'm using zpool iostat to > measure performance. Would you say that smaller raidz2 sets would give > me more reliable and better performance? I'm willing to give it a > shot... >
Yes, more smaller raid-sets will give you better performance, since zfs distributes (stripes) data on all of them. What's your IO pattern? random writes? sequential writes? Basicly if you have 2x 11-disk raidz2 sets you'll be limited to around performance of 2 disks, in the worst case of small random IO. (the parity needs to be written and that limits the performance of raidz/z2/z3 to the performance of single disk). This is not really zfs specific at all, it's the same with any raid implementation. -- Pasi > On Fri, Jun 18, 2010 at 4:42 AM, Pasi Kärkkäinen <pa...@iki.fi> wrote: > > On Fri, Jun 18, 2010 at 01:26:11AM -0700, artiepen wrote: > >> Well, I've searched my brains out and I can't seem to find a reason for > >> this. > >> > >> I'm getting bad to medium performance with my new test storage device. > >> I've got 24 1.5T disks with 2 SSDs configured as a zil log device. I'm > >> using the Areca raid controller, the driver being arcmsr. Quad core AMD > >> with 16 gig of RAM OpenSolaris upgraded to snv_134. > >> > >> The zpool has 2 11-disk raidz2's and I'm getting anywhere between 1MB/sec > >> to 40MB/sec with zpool iostat. On average, though it's more like 5MB/sec > >> if I watch while I'm actively doing some r/w. I know that I should be > >> getting better performance. > >> > > > > How are you measuring the performance? > > Do you understand raidz2 with that big amount of disks in it will give you > > really poor random write performance? > > > > -- Pasi > > > >> I'm new to OpenSolaris, but I've been using *nix systems for a long time, > >> so if there's any more information that I can provide, please let me know. > >> Am I doing anything wrong with this configuration? Thanks in advance. > >> -- > >> This message posted from opensolaris.org > >> _______________________________________________ > >> zfs-discuss mailing list > >> zfs-discuss@opensolaris.org > >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > > > > > -- > Curtis E. Combs Jr. > System Administrator Associate > University of Georgia > High Performance Computing Center > ceco...@uga.edu > Office: (706) 542-0186 > Cell: (706) 206-7289 > Gmail Chat: psynoph...@gmail.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
