Thinks for help.
If df -h is sufficient to get the information:
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda3 9.6G 7.1G 2.1G 78% /
none 9.6G 7.1G 2.1G 78% /usr/lib/modules
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.0G 0 1.0G 0% /dev/shm
tmpfs 151M 2.6M 149M 2% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 151M 0 151M 0% /sys/fs/cgroup
/dev/xvdb 15G 6.6G 8.2G 45% /rw
tmpfs 31M 12K 31M 1% /run/user/1000
The other qubes has similar results to this. No line at colum Use% is higher than 90%.
I have journalctl that i issued today if it helps.