Is it safe to remove these BTRFS snapshots?

English Install/Boot/Login
#1

Updating my old OpenSUSE 13.1 to Tumbleweed, I made the mistake of setting / as btrfs, as recommended. It quickly filled my partition to the point of not being able to do more updates. I have managed to disable all new snapshots, and remove the newer ones, but I am wondering whether it is safe to remove the following ones, still left:


Type   | # | Pre # | Date                             | User | Cleanup | Description           | Userdata     
-------+---+-------+----------------------------------+------+---------+-----------------------+--------------
single | 0 |       |                                  | root |         | current               |              
single | 1 |       | Mon 07 Aug 2017 04:07:50 PM CEST | root |         | first root filesystem |              
single | 2 |       | Mon 07 Aug 2017 04:50:55 PM CEST | root | number  | after installation    | important=yes

seafire:~ # du -hs /.snapshots/*
7.7G    /.snapshots/1
7.9G    /.snapshots/2
4.0K    /.snapshots/grub-snapshot.cfg

seafire:~ # df -h /
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda6        19G   14G  3.9G  79% /

Otherwise I will need to reinstall with ext4: right now I still don’t have enough space left for an update.:\

Thank you!

#2

Hi
No, leave those, your assumption is incorrect with disk usage for snapshots, what you need to do is balance btrfs;


/etc/cron.weekly/btrfs-balance

See how that goes…

#3

One of them is your current root filesystem. Check mount options (e.g. /proc/self/mountinfo) for subvol option or use “btrfs sub get-default /” (the latter in case of openSUSE should match your actual root).

#4

Thanks a lot! :slight_smile:


seafire:~ # df -h /
Filesystem      Size  Used Avail Use% Mounted on
**/dev/sda6        19G   15G  3.3G  82% /**

seafire:~ # btrfs sub get-default / 
ID 259 gen 7968 top level 258 path @/.snapshots/1/snapshot

seafire:~ # snapper delete 2

seafire:~ # snapper list
Type   | # | Pre # | Date                     | User | Cleanup | Description           | Userdata
-------+---+-------+--------------------------+------+---------+-----------------------+---------
single | 0 |       |                          | root |         | current               |         
single | 1 |       | Mon Aug  7 16:07:50 2017 | root |         | first root filesystem |         

seafire:~ # df -h /
Filesystem      Size  Used Avail Use% Mounted on
**/dev/sda6        19G  9.8G  7.5G  57% /**

seafire:~ # /etc/cron.weekly/btrfs-balance
Before balance of /
Data, single: total=15.01GiB, used=9.27GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=640.00MiB, used=236.41MiB
GlobalReserve, single: total=27.02MiB, used=0.00B
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda6        20G   11G  8.0G  57% /
Done, had to relocate 0 out of 22 chunks
Dumping filters: flags 0x1, state 0x0, force is off
  DATA (flags 0x2): balancing, usage=1
Done, had to relocate 0 out of 22 chunks
Dumping filters: flags 0x1, state 0x0, force is off
  DATA (flags 0x2): balancing, usage=5
Done, had to relocate 0 out of 22 chunks
Dumping filters: flags 0x1, state 0x0, force is off
  DATA (flags 0x2): balancing, usage=10
Done, had to relocate 1 out of 22 chunks
Dumping filters: flags 0x1, state 0x0, force is off
  DATA (flags 0x2): balancing, usage=20
Done, had to relocate 1 out of 21 chunks
Dumping filters: flags 0x1, state 0x0, force is off
  DATA (flags 0x2): balancing, usage=30
Done, had to relocate 0 out of 20 chunks
Dumping filters: flags 0x1, state 0x0, force is off
  DATA (flags 0x2): balancing, usage=40
Done, had to relocate 2 out of 20 chunks
Dumping filters: flags 0x1, state 0x0, force is off
  DATA (flags 0x2): balancing, usage=50
Done, had to relocate 0 out of 18 chunks
Done, had to relocate 0 out of 18 chunks
Dumping filters: flags 0x6, state 0x0, force is off
  METADATA (flags 0x2): balancing, usage=1
  SYSTEM (flags 0x2): balancing, usage=1
Done, had to relocate 1 out of 18 chunks
Dumping filters: flags 0x6, state 0x0, force is off
  METADATA (flags 0x2): balancing, usage=5
  SYSTEM (flags 0x2): balancing, usage=5
Done, had to relocate 1 out of 18 chunks
Dumping filters: flags 0x6, state 0x0, force is off
  METADATA (flags 0x2): balancing, usage=10
  SYSTEM (flags 0x2): balancing, usage=10
Done, had to relocate 1 out of 18 chunks
Dumping filters: flags 0x6, state 0x0, force is off
  METADATA (flags 0x2): balancing, usage=20
  SYSTEM (flags 0x2): balancing, usage=20
Done, had to relocate 2 out of 18 chunks
Dumping filters: flags 0x6, state 0x0, force is off
  METADATA (flags 0x2): balancing, usage=30
  SYSTEM (flags 0x2): balancing, usage=30
Done, had to relocate 3 out of 17 chunks
After balance of /
Data, single: total=11.01GiB, used=9.27GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=384.00MiB, used=235.02MiB
GlobalReserve, single: total=25.62MiB, used=0.00B
Filesystem      Size  Used Avail Use% Mounted on
**/dev/sda6        20G   11G  8.6G  56% /**