Data, RAID1: total=417.12GiB, used=131.33GiB You have 417(total)-131(used) blocks wo are only partial filled. You should balance your file-system.
At first you need some free space. You could remove some files / old snapshots etc. or you add a empty USB-Stick with min. 4 GB to your BTRFS-Pool (after balancing complete you can remove the stick from the pool). But at first you should try to free emty data and meta data blocks: btrfs balance start -musage=0 /mnt btrfs balance start -dusage=0 /mnt Then you an run a full balance or a partial balance: #a partial balance with reorganize data blocks less then 50% filled btrfs balance start -dusage=50 /mnt #or a full balance btrfs balance start /mnt Because of a possible bug you should disable all snapshot scripts (like cron-jobs) during the balance. If this solve the "No space left" issues you must remove old snapshots. 2016-09-20 8:58 GMT+02:00 Hugo Mills <h...@carfax.org.uk>: > On Tue, Sep 20, 2016 at 03:47:14PM +0900, Tomasz Chmielewski wrote: >> How to understand the following "btrfs fi show" output? > > This gives a write-up (and worked example) of an answer to your question: > > https://btrfs.wiki.kernel.org/index.php/FAQ#Understanding_free_space.2C_using_the_original_tools > > If you've got any follow-up questions after reading it, please do > come back and we can try to improve the FAQ entry. :) > > Hugo. > >> # 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 >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > Hugo Mills | I can resist everything except temptation. > hugo@... carfax.org.uk | > http://carfax.org.uk/ | > PGP: E2AB1DE4 | -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
