How do I capture a memory dump of a running guest from z/VM?

The following process is used to dump the memory contents of a Linux guest from z/VM. This causes a temporary loss of connectivity to the guest as the memory image is dumped, but is otherwise safe to perform on a running system. This is also the preferred method to capture a memory dump when the guest is unresponsive. To configure the guest to dump to a DASD device on kernel panic, see the fol...