How to understand the following "btrfs fi show" output?
# btrfs fi show /var/lib/lxd
Label: 'btrfs' uuid: f5f30428-ec5b-4497-82de-6e20065e6f61
Total devices 2 FS bytes used 136.18GiB
devid 1 size 423.13GiB used 423.13GiB path /dev/sda3
devid 2 size 423.13GiB used 423.13GiB path /dev/sdb3
Why is it "size 423.13GiB used 423.13GiB"? Is it full?
I had "No space left" on this filesystem just yesterday (running kernel
4.7.4). This is btrfs RAID-1 on SSD disks. This filesystem is used for
20-30 LXD containers with different roles (mongo, mysql, postgres
databases, webservers etc.), around 150 read-only snapshots, btrfs
compression is disabled.
Both "btrfs fi df" and "df -h" show plenty of space:
# btrfs fi df /var/lib/lxd
Data, RAID1: total=417.12GiB, used=131.33GiB
System, RAID1: total=8.00MiB, used=80.00KiB
Metadata, RAID1: total=6.00GiB, used=4.86GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 424G 137G 286G 33% /var/lib/lxd
Tomasz Chmielewski
https://lxadm.com
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