Hi!
I've been using btrfs as my main NAS filesystem for a bunch of years
now, and I always found that managing dozens of subvolumes having dozens
of snapshots each was not really straightforward, especially when trying
to get an overview of "what's taking space on my filesystem". I was
missing the niceness of the "zfs list" command, which does that quite
well.
So I've started to write a wrapper around btrfs qgroup show and btrfs fi
df (then btrfs fi usage when it got out), to implement this broad
overview of my filesystem I was missing so much.
Adding some features along the way, I thought that after all it might
also be useful to others than me!
As stdout is better than a thousand words, here's for example how it can
show you a complex hierarchy of intricated snapshots:
root@nas:~# btrfs-list /mnt/a
NAME TYPE REFER USED
MOUNTPOINT
4582dacf fs - 0.00
(1002.88M free)
[main] mainvol 16.00k 16.00k
/mnt/a
sub1 subvol 16.00k 16.00k
sub1/.snap1 snap 16.00k 16.00k
sub1/.snap2 snap 16.00k 16.00k
sub1/subsub1 snap 16.00k 16.00k
sub1/subsub1/.snap3 snap 16.00k 16.00k
sub1/subsub1/subsubsub1 snap 16.00k 16.00k
sub1/subsub1/subsubsubsub1 snap 16.00k 16.00k
Or how it can help you find big snapshots that you might want to get rid
of if you're running out of space:
root@nas:~# btrfs-list --snap-min-used 4G --snap-only /tank
NAME TYPE
REFER USED MOUNTPOINT
backups/.snaps/skyline/20130213_231649_lastskyline rosnap
22.52G 19.58G
backups/.snaps/box/20171231_221207_monthly.12 rosnap
88.73G 4.96G
backups/.snaps/box/20180130_221209_monthly.11 rosnap
91.25G 4.90G
backups/.snaps/box/20180307_154215_monthly.10 rosnap
96.28G 10.72G
backups/.snaps/box/20190120_193004_weekly.3 rosnap
56.45G 4.25G
backups/.snaps/nasroot/20180122_091325_monthly.12 rosnap
34.65G 10.79G
backups/.snaps/nasroot/20180221_092311_monthly.11 rosnap
31.96G 4.98G
backups/.snaps/nasroot/20180323_092734_monthly.10 rosnap
33.69G 7.05G
backups/.snaps/nasroot/20180820_205559_monthly.5 rosnap
31.74G 5.37G
.syncthing-bkp rosnap
40.48G 8.15G
Want to give it a try? Here you are:
https://github.com/speed47/btrfs-list
There are a couple snapshots there too, to give you a rough idea of how
it looks like (yes, it also has nice colors)
Happy btrfs weekend!
--
Stéphane.
