Disk sometimes full

[lilithhafner]

I frequently see out of disk space errors, but I also have several GB free, and I am confused. I’d like to know why this is happening and how to fix it.

The output of df indicates free space

x@fedora:~$ df
Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/nvme0n1p7  47166464 43867960   3149288  94% /
vendorfw         3813344    80976   3732368   3% /usr/lib/firmware/vendor
devtmpfs            4096        0      4096   0% /dev
tmpfs            3813344        0   3813344   0% /dev/shm
tmpfs            1525344     8816   1516528   1% /run
/dev/loop0           128      128         0 100% /var/lib/snapd/snap/bare/5
/dev/loop1         70912    70912         0 100% /var/lib/snapd/snap/core22/1125
/dev/loop3         93952    93952         0 100% /var/lib/snapd/snap/gtk-common-themes/1535
/dev/loop2        486528   486528         0 100% /var/lib/snapd/snap/gnome-42-2204/143
/dev/loop4        187008   187008         0 100% /var/lib/snapd/snap/signal-desktop/627
/dev/loop5        187008   187008         0 100% /var/lib/snapd/snap/signal-desktop/629
/dev/loop6        188800   188800         0 100% /var/lib/snapd/snap/signal-desktop/643
/dev/loop7         36096    36096         0 100% /var/lib/snapd/snap/snapd/20674
/dev/nvme0n1p7  47166464 43867960   3149288  94% /home
/dev/nvme0n1p6    996780   266356    661612  29% /boot
/dev/nvme0n1p5    510872   134072    376800  27% /boot/efi
tmpfs            3813360       64   3813296   1% /tmp
tmpfs             762656      720    761936   1% /run/user/1000

And I can create large files as a non-root user

x@fedora:~/demo$ du
0	.
x@fedora:~/demo$ head --bytes 1000000000 /dev/random >> file
x@fedora:~/demo$ du
976564	.
x@fedora:~/demo$ du -h
954M	.

And I can create large files in /tmp

x@fedora:/tmp/demo2$ du
0	.
x@fedora:/tmp/demo2$ head --bytes 1000000000 /dev/random >> file
x@fedora:/tmp/demo2$ du
976576	.
x@fedora:/tmp/demo2$ du -h
954M	.

And even in new subdirectories in /

x@fedora:/demo3$ du
0	.
x@fedora:/demo3$ head --bytes 1000000000 /dev/random >> filex@fedora:/demo3$ du
976564	.
x@fedora:/demo3$ du -h
954M	.

And as root I can make large files in / itself

x@fedora:/$ su
Password: 
root@fedora:/# head --bytes 1000000000 /dev/random >> file
root@fedora:/# 
exit
x@fedora:/$ du file
976564	file
x@fedora:/$ du -h file
954M	file

Yet when I edit a file with the Text Editor utility and try to save it says

Failed to save document
Error renaming temporary file: No space left on disk

I’m on Fedora Asahi Remix release 39 with GNOME desktop manager.

[lilithhafner]

Moving items to trash also fails (but rm succeeds) and moving items in removable media to trash also succeeds.

Yet I can still create large files and move files in /home/x/.local/share/Trash/info/

[hedayat (Hedayat Vatankhah)]

Well, this is mostly a btrfs question rather than an Asahi one.

Anyway, ‘free space’ in BTRFS is a bit complicated, as it might refer to both metadata space and data space.

BTW, unfortunately I’ve not yet reached that state so I can’t help you much, but the info provided here should be useful:

BTRFS problems: "no space left on device" but there is enough, multiple block group profiles

no Filesystem Inodes IUsed IFree IUse% Mounted on devtmpfs 2.0M 589 2.0M 1% /dev tmpfs 2.0M 1 2.0M 1% /dev/shm tmpfs 800K 1.2K 799K 1% /run /dev/dm-1 0 0 0 - / tmpfs 400K 65 400K 1% /tmp /dev/dm-1 0 0 0 - /home /dev/sda1 126K 448 125K 1% /boot tmpfs 398K 244 398K 1% /run/user/1000 /dev/loop0 479 479 0 100% /var/lib/snapd/snap/snapd/1364…

You might also check this as a non-QA link: btrfs: No space left on device