On Mon, 28 Jul 2008, Tharindu Rukshan Bamunuarachchi wrote: > > I have tried your pdf but did not get good latency numbers even after array > tuning...
Right. And since I observed only slightly less optimal performance from a mirror pair of USB drives it seems that your requirement is not challenging at all for the storage hardware. USB does not offer very much throughput. A $200 portable disk drive is able to almost match a $23K drive array for this application. I did test your application with output to /dev/null and /tmp (memory based) and it did report consistently tiny numbers in that case. It seems likely that writes to ZFS encounter a "hickup" every so often in the write system call. There is still the possibility that a bug in your application is causing the "hickup" in the write timings. 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
