On Mon, 31 May 2010, Sandon Van Ness wrote:
With sequential writes I don't see how parity writing would be any different from when I just created a 20 disk zpool which is doing the same writes every 5 seconds but the only difference is it isn't maxing out CPU usage when doing the writes and and I don't see the transfer stall during the writes like I did on raidz2.
I am not understanding the above paragraph, but hopefully you agree that raidz2 issues many more writes (based on vdev stripe width) to the underlying disks than a simple non-redundant load-shared pool does. Depending on your system, this might not be an issue, but it is possible that there is an I/O threshold beyond which something (probably hardware) causes a performance issue.
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
