On Thu, Feb 13, 2014 at 11:32:03AM -0500, Jim Salter wrote: > That is FANTASTIC news. Thank you for wielding the LART gently. =) No LART necessary. :) Nobody knows everything, and it's not a particularly heavily-documented or written-about feature at the moment (mostly because it only exists in Chris's local git repo). > I do a fair amount of public speaking and writing about next-gen > filesystems (example: http://arstechnica.com/information-technology/2014/01/bitrot-and-atomic-cows-inside-next-gen-filesystems/) > and I will be VERY sure to talk about the upcoming divorce of stripe > size from array size in future presentations. This makes me > positively giddy. > > FWIW, after writing the above article I got contacted by a > proprietary storage vendor who wanted to tell me all about his > midmarket/enterprise product, and he was pretty audibly flummoxed > when I explained how btrfs-RAID1 distributes data and redundancy - > his product does something similar (to be fair, his product also > does a lot of other things btrfs doesn't inherently do, like > clustered storage and synchronous dedup), and he had no idea that > anything freely available did anything vaguely like it. That's quite entertaining for the bogglement factor. Although, again, see my comment above... Hugo. > I have a feeling the storage world - even the relatively > well-informed part of it that's aware of ZFS - has little to no > inclination how gigantic of a splash btrfs is going to make when it > truly hits the mainstream. > > >>This could be a pretty powerful setup IMO - if you implemented > >>something like this, you'd be able to arbitrarily define your > >>storage efficiency (percentage of parity blocks / data blocks) and > >>your fault-tolerance level (how many drives you can afford to lose > >>before failure) WITHOUT tying it directly to your underlying disks, > >>or necessarily needing to rebalance as you add more disks to the > >>array. This would be a heck of a lot more flexible than ZFS' > >>approach of adding more immutable vdevs. > >> > >>Please feel free to tell me why I'm dumb for either 1. not realizing > >>the obvious flaw in this idea or 2. not realizing it's already being > >>worked on in exactly this fashion. =) > > The latter. :) > -- === 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 --- Nothing right in my left brain. Nothing left in --- my right brain.
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