Re: New file system with same issue (was: Again, no space left on device while rebalancing and recipe doesnt work)

[Marc Haber <mh+linux-btrfs@zugschlus.de>]

On Mon, Mar 14, 2016 at 01:00:13AM +0100, Henk Slager wrote:
> On Sun, Mar 13, 2016 at 9:56 PM, Marc Haber <mh+linux-btrfs@zugschlus.de> wrote:
> > Yes, I want to keep the possibility to remove huge files from
> > snapshots that shouldnt have been on a snapshotted volume in the first
> > place without having to ditch the entire snapshot.
> 
> You could do ro snapshotting and in case you want to modify something
> inside a snapshot/subvolume:
> # btrfs property set <subvolume> ro false
> # rm <subvolume>/<somefile>
> # btrfs property set <subvolume> ro true

I was not aware that it is possible to fiddle with the ro property of
an already existing snapshot. I am not yet sure whether I love or hate
this.

> >> Also, If some part of the OS or tools scans through the snapshot dirs
> >> every now and then with atime creation on, metadata grows without a
> >> real need.
> >
> > I mount with noatime and nodiratime anyway, and the directory the
> > snapshots are mounted to (/mnt/snapshots) are excluded in
> > updatedb.conf. Any other idea which tool might scan filesystems and
> > that might not be noticed when it's running about a five digit number
> > of snapshots?
> 
> Maybe baloo or so if you use KDE.

I usually do those tests via ssh without even being logged in to a
local desktop.

Greetings
Marc

-- 
-----------------------------------------------------------------------------
Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421