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". Regards, Bart -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
