On Tue, 21 Apr 2009, Robert Milkowski wrote:
BF> One change is that I had applied a firmware tweak from Joel Miller BF> (apparently no longer at Sun) to tell the array to ignore cache sync BF> commands (i.e. don't wait for disk). This updated firmware seems BF> totally different so it is unlikely that the firmware tweak will work. Well, you need to disable cache flushes on zfs side then (or make a firmware change work) and it will make a difference.
Based on results obtained when I re-ran the benchmark, it seems that these various tweaks are either no longer needed, or the existing tweaks were carried forward from the older firmware. I don't know what was going on the first time I ran the benchmark and saw odd performance with 16GB files.
Large file writes are now almost "wire" speed given that I have two 4 Gbit FC optical links and am using mirroring with the mirror pairs carefully split across the two controllers.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, 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
