On 11/30/2011 04:03 PM, Alasdair G Kergon wrote:
On Wed, Nov 30, 2011 at 04:48:05PM -0500, Frederick Grose wrote:
snapshot Invalid does seem to prevent even read-only access.
Indeed - once it's invalid, that's the end of it.
If we didn't do that, changes to areas of the origin that hadn't already
changed would start to appear in the 'snapshot' and the snapshot would become a
nonsensical hybrid of the two devices containing no information about which
parts of it got corrupted.
Don't allow your snapshots to run out of space!
So wouldn't it be much better as far as the user is concerned if, the
instant a snapshot reached capacity, it fell over into a read-only state
(instead of being marked invalid?), such that further corruption beyond
such plug-pulling variety could/would not occur? If so, would it be
straightforward to write such a patch and would it be beneficial enough
to end upstream?
-dmc
If you want to see what you can recover, use that code I mentioned earlier.
Alasdair
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
