On Fri, 26 Sep 2008, Ross Becker wrote: > > I configured up an 11 drive RAID6 set + 1 hot spare on the Areca > controller put a ZFS on that raid volume, and ran bonnie++ against > it (16g size), and achieved 150 mb/s write, & 200 mb/s read. I then > blew that away, configured the Areca to present JBOD, and configured > ZFS with RAIDZ2 11 disks, and a hot spare. Running bonnie++ against > that, it achieved 40 mb/sec read and 40 mb/sec write. I wasn't > expecting RAIDZ to outrun the controller-based RAID, but I wasn't > expecting 1/3rd to 1/4 the performance. I've looked at the ZFS
Terrible! Have you tested the I/O performance of each drive to make sure that they are all performing ok? If the individual drives are found to be performing ok with your JBOD setup, then I would suspect a device driver, card slot, or card firmware performance problem. If RAID6 is done by the RAID card then backplane I/O to the card is not very high. If raidz2 is used, then the I/O to the card is much higher. With a properly behaving device driver and card, it is quite likely that ZFS raidz2 will outperform the on-card RAID6. You might try disabling the card's NVRAM to see if that makes a difference. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
