El Viernes, 1 de abril de 2016 10:05:07 Hugo Mills escribió:
> On Fri, Apr 01, 2016 at 11:50:50AM +0200, Alejandro Vargas wrote:
> > I am using a 2Tb disk for incremental backups.
> >
> > I use rsync for backing up to a subvolume, and each day I creates an
> > snapshot of the lastest snapshot and do rsync in this.
> >
> > When the disk becomes nearly full (100Gb or less available) I deletes the
> > oldest subvolume (withbtrfs subvolume delete).
> >
> > My problem is that *even removing ALL the subvolumes*, the free space does
> > not change. It continues reporting the same size (disk is nearly full).
> >
> > I tried "btrfs balance start /mnt/backup" but it takes hours and hours.
> >
> > I'm using linux 4.1.15
> > btrfs-progs v4.1.2
>
> Can you show us the output of both "sudo btrfs fi show" and "btrfs
> fi df /mnt/backup", please?
Before deleting subvolumes:
[root@backups ~]# df /mnt/backup
S.ficheros Tamaño Usados Disp Uso% Montado en
/dev/sdb1 1,9T 1,9T 5,0M 100% /mnt/backup
[root@backups ~]# ls -l /mnt/backup
total 0
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160318/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160328/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160330/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160401/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160404/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160406/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160408/
[root@backups ~]# btrfs fi show
Label: 'disco_backup' uuid: cbfe8735-9f53-46f5-be7e-40f6a61a5506
Total devices 1 FS bytes used 1.80TiB
devid 1 size 1.82TiB used 1.82TiB path /dev/sdb1
btrfs-progs v4.1.2
[root@backups ~]# btrfs fi df /mnt/backup
Data, single: total=1.79TiB, used=1.79TiB
System, DUP: total=32.00MiB, used=240.00KiB
Metadata, DUP: total=17.00GiB, used=15.83GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
Now I remove the oldest subvolume:
[root@backups ~]# btrfs subvolume delete /mnt/backup/back20160318/
Delete subvolume (no-commit): '/mnt/backup/back20160318'
[root@backups ~]# df /mnt/backup
S.ficheros Tamaño Usados Disp Uso% Montado en
/dev/sdb1 1,9T 1,9T 22M 100% /mnt/backup
[root@backups ~]# btrfs fi show
Label: 'disco_backup' uuid: cbfe8735-9f53-46f5-be7e-40f6a61a5506
Total devices 1 FS bytes used 1.80TiB
devid 1 size 1.82TiB used 1.82TiB path /dev/sdb1
[root@backups ~]# btrfs fi show
Label: 'disco_backup' uuid: cbfe8735-9f53-46f5-be7e-40f6a61a5506
Total devices 1 FS bytes used 1.80TiB
devid 1 size 1.82TiB used 1.82TiB path /dev/sdb1
btrfs-progs v4.1.2
[root@backups ~]# btrfs fi df /mnt/backup
Data, single: total=1.79TiB, used=1.79TiB
System, DUP: total=32.00MiB, used=240.00KiB
Metadata, DUP: total=17.00GiB, used=15.83GiB
GlobalReserve, single: total=512.00MiB, used=102.53MiB
Now I remove 2 more subvolumes:
[root@backups ~]# btrfs subvolume delete /mnt/backup/back20160328/
Delete subvolume (no-commit): '/mnt/backup/back20160328'
[root@backups ~]# btrfs subvolume delete /mnt/backup/back20160330/
Delete subvolume (no-commit): '/mnt/backup/back20160330'
[root@backups ~]# df /mnt/backup/
S.ficheros Tamaño Usados Disp Uso% Montado en
/dev/sdb1 1,9T 1,9T 348M 100% /mnt/backup
[root@backups ~]# btrfs fi show
Label: 'disco_backup' uuid: cbfe8735-9f53-46f5-be7e-40f6a61a5506
Total devices 1 FS bytes used 1.80TiB
devid 1 size 1.82TiB used 1.82TiB path /dev/sdb1
btrfs-progs v4.1.2
Data, single: total=1.79TiB, used=1.79TiB
System, DUP: total=32.00MiB, used=240.00KiB
Metadata, DUP: total=17.00GiB, used=15.83GiB
GlobalReserve, single: total=512.00MiB, used=98.94MiB
[root@backups ~]# ls -l /mnt/backup/
total 0
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160401/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160404/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160406/
drwxr-xr-x 1 root root 86 mar 20 16:23 back20160408/
Now I will remove the resting subvolumes
[root@backups ~]# btrfs subvolume delete /mnt/backup/back20160401/
Delete subvolume (no-commit): '/mnt/backup/back20160401'
[root@backups ~]# btrfs subvolume delete /mnt/backup/back20160404/
Delete subvolume (no-commit): '/mnt/backup/back20160404'
[root@backups ~]# btrfs subvolume delete /mnt/backup/back20160406/
Delete subvolume (no-commit): '/mnt/backup/back20160406'
[root@backups ~]# btrfs subvolume delete /mnt/backup/back20160408/
Delete subvolume (no-commit): '/mnt/backup/back20160408'
[root@backups ~]# ls -l /mnt/backup/
total 0
[root@backups ~]# df /mnt/backup/
S.ficheros Tamaño Usados Disp Uso% Montado en
/dev/sdb1 1,9T 1,9T 4,6G 100% /mnt/backup
[root@backups ~]# btrfs fi show
Label: 'disco_backup' uuid: cbfe8735-9f53-46f5-be7e-40f6a61a5506
Total devices 1 FS bytes used 1.80TiB
devid 1 size 1.82TiB used 1.82TiB path /dev/sdb1
btrfs-progs v4.1.2
[root@backups ~]# btrfs fi df /mnt/backup
Data, single: total=1.79TiB, used=1.78TiB
System, DUP: total=32.00MiB, used=240.00KiB
Metadata, DUP: total=17.00GiB, used=15.55GiB
GlobalReserve, single: total=512.00MiB, used=37.72MiB
My mount options are this:
[root@backups ~]# cat /etc/fstab |grep backup
LABEL=disco_backup /mnt/backup btrfs noauto,compress=zlib,compress-
force=zlib,commit=60,noatime 0 0
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