Re: how to clone a btrfs filesystem

[Martin Steigerwald <martin@lichtvoll.de>]

Am Donnerstag, 7. Mai 2015, 15:14:11 schrieb Paul Harvey:
> Sorry I'm late to this conversation...
> 
> On 18 April 2015 at 18:10, Martin Steigerwald <martin@lichtvoll.de> wrote:
> > That said, I think it can be scripted. But I am not aware of anyone
> > having done this. I may be missing something, so maybe someone on the
> > list has a recommendation.
> 
> I thought I'd mention that I have developed a script [1] which is a
> part of snazzer [2] which at least transports all snapshots of all
> subvolumes on all mounted btrfs filesystems (or a subset thereof),
> using send -p where possible between two local filesystems or a remote
> host via ssh. That is, of course, assuming your snapshots are named
> and located according to the idiomatic convention expected by
> snazzer-receive [1] - which is unlikely, I admit. Everybody uses btrfs
> slightly differently.

Thank you for the hint to your tool, sounds interesting. I am not sure 
whether it would work with my setup of having snapshots in root subvol, but 
then setting another subvol as default to hide snapshots behind a mount of 
the root subvol like this:

LABEL=home              /home                   btrfs           
noatime,space_cache,compress=lzo        0       0

LABEL=home              /mnt/home-snaps          btrfs           
noatime,space_cache,compress=lzo,subvolid=5     0       0

I know that space_cache is not needed after first mount with that option 
(thats why I think it does not make much sense to have this as a mount 
option in the first place, but rather as a property of the filesystem).

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7