Lvm

If your system does not boot up und you’re dropped to an initramfs shell after “waiting for root filesystem” fails – check your mdadm config /etc/mdadm/mdadm.conf Make sure it contains the correct definitions which are available with mdadm --detail --scan Adjust your config and run update-initramfs -u -k all to make the system bootable again.

First: Make sure to shut down the virtual machine or to unmount the disk inside it. Once finished you can start to extend the logical volume on the hypervisor: lvextend -L+400G /dev/vg0/disk e2fsck -f /dev/vg0/disk resize2fs /dev/vg0/disk There might be a chance you need kpartx, growpart (provided by cloud-guest-utils) followed by resize2fs to grow the mounted partition. In case you shut down the virtual machine you may start it again with ...