On Sun, 6 Sep 2009, Thomas Burgess wrote:
if you add a raidz group to a group of 3 mirrors, the entire pool slows down to the speed of the raidz..... while you technically CAN do it, it's a horrible idea.
I don't think it is necessarily as horrid as you say. Zfs does distribute writes to faster vdevs under heavy write load. There can be vdevs of somewhat different type and size (e.g. raidz and raidz2) which behave similarly enough to not cause much imbalance in the pool.
Saying that mixing vdev types is horrid is similar in nature to saying that not using the same type and model of drive throughout the pool is horrid. If you added a raidz vdev to a pool already using raidz vdevs, but the new drives are much faster than the existing drives, then the same sort of imbalance exists.
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
