On Wed, Aug 10, 2011 at 1:45 AM, Gregory Durham <gregory.dur...@gmail.com> wrote: > Hello, > We just purchased two of the sc847e26-rjbod1 units to be used in a > storage environment running Solaris 11 express. > > We are using Hitachi HUA723020ALA640 6 gb/s drives with an LSI SAS > 9200-8e hba. We are not using failover/redundancy. Meaning that one > port of the hba goes to the primary front backplane interface, and the > other goes to the primary rear backplane interface. > > For testing, we have done the following: > Installed 12 disks in the front, 0 in the back. > Created a stripe of different numbers of disks. After each test, I > destroy the underlying storage volume and create a new one. As you can > see by the results, adding more disks, makes no difference to the > performance. This should make a large difference from 4 disks to 8 > disks, however no difference is shown. > > Any help would be greatly appreciated! > > This is the result: > > root@cm-srfe03:/home/gdurham~# time dd if=/dev/zero > of=/fooPool0/86gb.tst bs=4096 count=20971520 > ^C3503681+0 records in > 3503681+0 records out > 14351077376 bytes (14 GB) copied, 39.3747 s, 364 MB/s
So, the problem here is that you're not testing the storage at all. You're basically measuring dd. To get meaningful results, you need to do two things: First, run it for long enough so you eliminate any write cache effects. Writes go to memory and only get sent to disk in the background. Second, use a proper benchmark suite, and one that isn't itself a bottleneck. Something like vdbench, although there are others. -- -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
