This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.
Step 1 - Enable NBD on the Host
modprobe nbd max_part=8
Nethermind as of January 2024 takes about 1.1 TiB of space on a snap sync, and then grows by ~ 27 GiB/week.
When it starts to fill its disk, it can be online pruned (no downtime) to free up space again, to around the size of a fresh sync.