Hi.
I have an issue were periodically a btrfs filesystem shows 100% utilized
0% available
# df -h /home
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cprt-50 30T 20T 0 100% /home
Then it goes back to normal as follows:
# df -h /home
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cprt-50 30T 20T 9.7T 67% /home
This filesystem was created on this kernel 5.4.6 that it's currently
running. This filesystem went from 0tb used to 20tb used and would show
this problem periodically as i was filling up the drive. There was no
ENOSPACE issues, so I thought it was just related to the heavy writing,
but now that the system is in regular service, it's still periodically
"filling up". but again, the only symptom I can see is gnome and df
showing the drive being full. nothing else indicates that the drive is
full.
I have some other btrfs filesystems that didn't show any issues. They
were created under earlier kernels, but with the same options. the
other difference is this new filesystem is on top 4kn drives, where the
others are all 512e.
Any advice would be welcome, for now I'm just ignoring the problem, and
making sure my backups are good.
filesystem creation commands:
mkfs.btrfs -f -O no-holes -d single -m raid1 -L tm /dev/mapper/cprt-50
/dev/mapper/cprt-53
first time mounted was with this:
mount -o clear_cache,space_cache=v2 LABEL=tm /mnt
diagnostics commands:
# uname -a
Linux static.bllue.org 5.4.6-301.fc31.x86_64 #1 SMP Tue Dec 24 15:09:19
EST 2019 x86_64 x86_64 x86_64 GNU/Linux
# btrfs --version
btrfs-progs v5.4
# btrfs fi show
Label: 't2' uuid: ce50d21c-7727-4a53-b804-d02480643dfa
Total devices 2 FS bytes used 640.00KiB
devid 1 size 447.13GiB used 2.01GiB path /dev/mapper/cprt-30
devid 2 size 447.13GiB used 2.01GiB path /dev/mapper/cprt-31
Label: 'btm' uuid: 0a5b42a7-0e39-48fa-be1f-4aa29bc323f2
Total devices 2 FS bytes used 19.45TiB
devid 1 size 14.55TiB used 9.75TiB path /dev/mapper/cprt-50
devid 2 size 14.55TiB used 9.75TiB path /dev/mapper/cprt-53
# btrfs fi df /home # Replace /home with the mount point of your
btrfs-filesystem
Data, single: total=19.45TiB, used=19.43TiB
System, RAID1: total=32.00MiB, used=2.05MiB
Metadata, RAID1: total=26.00GiB, used=25.73GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
