On 2015-08-06 03:23, Duncan wrote:
And for some people, this is very useful functionality. I use it to specifically exclude subsets of trivially reproducible data from backups (for example, I always clone public git repositories into individual subvolumes, and keep my local copy of the Portage tree on a separate one (when it isn't on a separate filesystem that is)).Martin posted on Wed, 05 Aug 2015 09:06:40 +0200 as excerpted:[W]hat is the penalty of a subvolume compared to a directory? From a design perspective, couldn't all directories just be subvolumes?In addition to the performance issues mentioned by others, there's at least one further practical reason as well. Snapshots stop at subvolume boundaries. It's thus quite useful to use subvolumes to delineate the limits of the snapshot, saying, in effect, snapshot this dir (which happens to be a subvol not just a normal dir) recursively, but don't snapshot the subtree starting with this nested subdir (which again is a (different) subvol).
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