On Fri, 8 Oct 2010, Roy Sigurd Karlsbakk wrote:
In addition to this comes another aspect. What if one drive fails and you find bad data on another in the same VDEV while resilvering. This is quite common these days, and for mirrors, that will mean data loss unless you mirror 3-way or more, which will be rather costy.
The "answer" to this is to schedule a periodic scrub. It is of course not a complete answer since the drive may degrade since the previous scrub and you might still lose some (or even all!) data. If you use mirrors or raidz1 you should definitely include a periodic scrub in the plan. The good news is that mirrors scrub quickly with far fewer I/Os and system impact than raidz?.
Regardless, nothing beats raidz3 based on computable statistics. 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
