I also have a dtrace script that I found that supposedly gives a more accurate reading. Usually, though, it's output is very close to what zpool iostat says. Keep in mind this is a test environment, there's no production here, so I can make and destroy the pools as much as I want to play around with. I'm also still learning about dtrace.
On Fri, Jun 18, 2010 at 4:52 AM, Curtis E. Combs Jr. <ceco...@uga.edu> 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... > > 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 > -- 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
