VDO Recovery from a full disk condition, using snapshots above and below VDO and temporary storage in /tmp.
Especially useful on bare-metal where underlying disks cannot increase in size the way they can in a VM. (Note VDO doesn't allow aggregating storage into one backing store device)
Used successfully by Red Hat customers to recover VDO devices when no other method would have worked - see https://access.redhat.com/solutions/3520581#comment-2100841