On Fri, 15 Feb 2008, Luke Lonergan wrote: >> I only managed to get 200 MB/s write when I did RAID 0 across all >> drives using the 2540's RAID controller and with ZFS on top. > > Ridiculously bad.
I agree. :-( >> While I agree that data is sent twice (actually up to 8X if striping >> across four mirrors) > > Still only twice the data that would otherwise be sent, in other words: the > mirroring causes a duplicate set of data to be written. Right. But more little bits of data to be sent due to ZFS striping. > Given that you're not even saturating the FC-AL links, the problem is in the > hardware RAID. I suggest disabling read and write caching in the hardware > RAID. Hardware RAID is not an issue in this case since each disk is exported as a LUN. Performance with ZFS is not much different than when hardware RAID was used. I previously tried disabling caching in the hardware and it did not make a difference in the results. 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
