On Fri, 15 Feb 2008, Roch Bourbonnais wrote: >> >> As mentioned before, the write rate peaked at 200MB/second using >> RAID-0 across 12 disks exported as one big LUN. > > What was the interlace on the LUN ?
There are two 4Gbit FC interfaces on an Emulex LPe11002 card which are supposedly acting in a load-share configuration. > If this is 165MB application rate consider that ZFS sends that much to each > side of the mirror. > Your data channel rate was 330MB/sec. Yes, I am aware of the ZFS RAID "write penalty" but in fact it has only cost 20MB per second vs doing the RAID using controller firmware (150MB vs 170MB/second). This indicates that there is plenty of communications bandwidth from the host to the array. The measured read rates are in the 470MB to 510MB/second range. While writing, it is clear that ZFS does not use all of the drives for writes at once since the drive LEDs show that some remain temporarily idle and ZFS cycles through them. I would be very happy to hear from other StorageTek 2540 owners as to the write rate they were able to achieve. 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
