On Sat, Jun 28, 2014 at 09:38:00AM +0200, Martin Steigerwald wrote: > Am Samstag, 28. Juni 2014, 16:28:23 schrieb Russell Coker: > > > So look for N-way-mirroring when you go RAID shopping, and no, btrfs does > > > not have it at this time, altho it is roadmapped for implementation after > > > completion of the raid5/6 code. > > > > > > > > > > > > FWIW, N-way-mirroring is my #1 btrfs wish-list item too, not just for > > > device redundancy, but to take full advantage of btrfs data integrity > > > features, allowing to "scrub" a checksum-mismatch copy with the content > > > of a checksum-validated copy if available. That's currently possible, > > > but due to the pair-mirroring-only restriction, there's only one > > > additional copy, and if it happens to be bad as well, there's no > > > possibility of a third copy to scrub from. As it happens my personal > > > sweet-spot between cost/performance and reliability would be 3-way > > > mirroring, but once they code beyond N=2, N should go unlimited, so N=3, > > > N=4, N=50 if you have a way to hook them all up... should all be possible. > > > > What I want is the ZFS copies= feature. > > Something like this, even more flexible, was planned to be added. There were > some discussion on how to specificy complex redundancy patterns totally > flexibly > exactly with how much redundancy, how much spares and so on. > > I didn't read any of this since a long time. I wonder what happened to this > idea.
It's moving slowly in fits and starts. I haven't forgotten it. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- But people have always eaten people, / what else is there to --- eat? / If the Juju had meant us not to eat people / he wouldn't have made us of meat.
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