Re: Data recovery after RBD I/O error

[Austin S Hemmelgarn]

On 2015-01-06 23:11, Jérôme Poulin wrote:

On Mon, Jan 5, 2015 at 6:59 AM, Austin S Hemmelgarn
<ahferro...@gmail.com> wrote:

Secondly, I would highly recommend not using ANY non-cluster-aware FS on top
of a clustered block device like RBD

For my use-case, this is just a single server using the RBD device. No
clustering involved on the BTRFS side of thing.

My only point is that there isn't anything in BTRFS to handle it accidentally being multiply mounted. Ext* for example aren't clustered, but do have an optional feature to prevent multiple mounting.

However, it was really useful to take snapshots (just like LVM) before 
modifying the
filesystem in any way.

Have you tried Ceph's built in snapshot support? I don't remember how to use it, but I do know it is there (at least, it is in the most recent versions), and it is a bit more like LVM's snapshots than BTRFS is.

smime.p7s
Description: S/MIME Cryptographic Signature