No space on root

[TrevorH]

How big did you tell it that the Windows VM's disk was allowed to be? It will grow until it reaches that limit.

[Kova78]

I don't think I had set a limit and that is the problem...

[TrevorH]

You have to set a limit. If you have qemu-img installed then you can run qemu-img info /var/lib/libvirt/images/filename.img to get info about that filename.img

[Kova78]

Solved!

I migrated vm to my home and yum run successfully.
Thank you for your help!

[kistvan@Centos7MainServer ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos_centos7mainserver-root 50G 9.6G 41G 20% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.8G 0 3.8G 0% /dev/shm
tmpfs 3.8G 9.9M 3.8G 1% /run
tmpfs 3.8G 0 3.8G 0% /sys/fs/cgroup
/dev/sda2 494M 152M 342M 31% /boot
/dev/sda1 200M 12M 189M 6% /boot/efi
/dev/mapper/centos_centos7mainserver-home 873G 615G 259G 71% /home
tmpfs 774M 4.0K 774M 1% /run/user/42
tmpfs 774M 60K 774M 1% /run/user/1000
[kistvan@Centos7MainServer ~]$