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 |
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