On Thu, Mar 24, 2016 at 2:47 PM, Anton Aylward <opensuse@antonaylward.com> wrote:
On 03/24/2016 03:06 PM, John Andersen wrote:
Snapshots on the same drive always struck me as magical thinking.
Indeed. The times I need backups most are the times that the dis as a whole is unrecoverable. Snapshots would be of no use.
RAID anybody? Well LVM makes mirroring easy. I can mirror LVs rather than the while disk.
LVM raid is rather badass from a flexibility perspective. It doesn't offer the feature set of mdadm however so you still have to evaluate what your use case requires. Certainly being able to create an LV that's raid1 and another that's raid5 or even raid6 is very useful if you're regularly having to spin up, grow, and tear town volumes, because doing this with mdadm and then LVM on top is a pain. On the feature list but no code yet for Btrfs is per subvolume raid; conceivably it could be per directory or per file, similar to compression and eventually encryption. There's no format change needed for this, it's just a matter of having a way to associate a redundancy profile with a subvolume, directory or file, which could just be an xattr. And then the allocator puts the file into a chunk with that profile type, which is already how the allocator works. -- Chris Murphy -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org