> Update to my own post. Further tests more > consistently resulted in closer to 150MB/s. > > When I took one disk offline, it was just shy of > 100MB/s on the single disk. There is both an obvious > improvement with the mirror, and a trade-off (perhaps > the latter is controller related?). > > I did the same tests on my work computer, which has > the same 7200.12 disks (except larger), an i7-920, > ICH10, and 12GB memory. The mirrored pool > performance was identical, but the individual disks > performed at near 120MB/s when isolated. Seems like > the 150MB/s may be a wall, and all disks and > controllers are definitely in SATA2 mode. But I > digress....
You could be running into a hardware bandwidth bottleneck somewhere (controller, bus, memory, cpu, etc.) - however my experience isn't exactly similar to yours since I am not even getting 150MBps from 8 disks - so I am probably running into a 1) hardware issue 2) driver issue 3) zfs issue 4) configuration issue I have tried with Osol 09.06 but the driver doesn't recognize my SAS controller. I then went with Osol b134 to get my controller recognized and have the performance issues I am discussing now, and now I'm using the RC2 of Nexenta (osol b134 with backported fixes) with the same performance issues. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
