> This mode has many benefits, the least not being that is practically > creates a fully dynamic mode of mirroring (replacing raid1 and raid10 > variants), especially when combined with the upcoming vdev remove and > defrag/rebalance features.
Vdev remove, that's a sure thing. I've heard about defrag before, but when I asked, no one confirmed it. The same goes for that mention of single disk "RAID", that's I think supposed to write one parity block for n data blocks, so that disk errors can be healed without having to have a real redundant setup. > Is this already available? Is it scheduled? Whyt not? Actually, ZFS is already supposed to try to write the ditto copies of a block on different vdevs if multiple are available. As far as finding out goes, I suppose if you use a simple JBOD, in theory, you could try by offlining one disk. But I think in a non-redundant setup, the pool refuses to start if a disk is missing (I think that should be changed, to allow evacuation of properly dittoed data). -mg
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