On Fri, Mar 5, 2010 at 1:49 PM, Bart Noordervliet <b...@noordervliet.net> wrote: > On Fri, Mar 5, 2010 at 21:31, Josef Bacik <jo...@redhat.com> wrote: >>> Since I have three devices in a RAID1 pool, can it survive 2 drive failures? >> >> Yes, tho you won't be able to remove more than 1 at a time (since it wants >> you >> to keep at least two disks around). Thanks, >> >> Josef > > Hmm, I would expect the raid1 data mode to keep 2 copies of each file > and thus yield 50% effective storage capacity, even with 3 disks. I > see no real reason to stick with the full-disk mirroring mentality of > previous raid systems since raid implemented in a filesystem works > differently. Or would it be difficult to implement btrfs raid1 like > this? > > Maybe it's worth to consider leaving the burdened raid* terminology > behind and name the btrfs redundancy modes more clearly by what they > do. For instance "-d double|triple" or "-d 2n|3n". And for raid5/6 "-d > single-parity|double-parity" or "-d n+1|n+2". >
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