> This is a bit OT, but can you have one vdev that is a duplicate > of another vdev? By that I mean say you had 2x 7 disk raid-z2 > vdevs, instead of them both being used in one large pool could > you have one that is a backup of the other, allowing you to > destroy one of them and re-build without data loss?
At least two ways I can think of: maybe you can make a mirror of raidz top-level vdevs, or simply use regular zfs send/recv syncs. This may possibly solve some of fragmentation troubles by regrouping blocks during send/recv - but I asked about this recently on the list and did not get a definite answer. //Jim
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