dd if=/dev/disk | gzip | nc xenhost port
and on the remote host they do:
- nc -l port > /var/lib/xen/images/disks.gz
+ nc -kl port > /var/lib/xen/images/disks
For (c) we can use device-mapper snapshots to mount a ramdisk above
the disks themselves. This allows us to make non-destructive changes