Are you putting your archive and redo logs on a separate zpool (not just a different zfs fs with the same pool as your data files) ?
Are you using direct io at all in any of the config scenarios you listed? /dale On Nov 22, 2008, at 12:41 PM, Chris Greer wrote: > So to give a little background on this, we have been benchmarking > Oracle RAC on Linux vs. Oracle on Solaris. In the Solaris test, we > are using vxvm and vxfs. > We noticed that the same Oracle TPC benchmark at roughly the same > transaction rate was causing twice as many disk I/O's to the backend > DMX4-1500. > > So we concluded this is pretty much either Oracle is very different > in RAC, or our filesystems may be the culprits. This testing is > wrapping up (it all gets dismantled Monday), so we took the time to > run a simulated disk I/O test with an 8K IO size. > > > vxvm with vxfs we achieved 2387 IOPS > vxvm with ufs we achieved 4447 IOPS > ufs on disk devices we achieved 4540 IOPS > zfs we achieved 1232 IOPS > > The only zfs tunings we have done are setting set zfs:zfs_nocache=1 > in /etc/system and changing the recordsize to be 8K to match the test. > > I think the files we are using in the test were created before we > changed the recordsize, so I deleted them and recreated them and > have started the other test...but does anyone have any other ideas? > > This is my first experience with ZFS with a comercial RAID array and > so far it's not that great. > > For those interested, we are using the iorate command from EMC for > the benchmark. For the different test, we have 13 luns presented. > Each one is its own volume and filesystem and a singel file on those > filesystems. We are running 13 iorate processes in parallel (there > is no cpu bottleneck in this either). > > For zfs, we put all those luns in a pool with no redundancy and > created 13 filesystems and still running 13 iorate processes. > > we are running Solaris 10U6 > -- > This message posted from opensolaris.org > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
