Literally 3/4 of the blog post is about how they migrate a VM.
With qemu they wouldn't need
the iscsi workaround as nbd (both server and client) is rock-solid in qemu. Nor the discard dance since qemu at the source knows what blocks are in use (via bitmap or zero-detection).
Also qemu can copy the data up-front so performance stays consistent.
With qemu they wouldn't need the iscsi workaround as nbd (both server and client) is rock-solid in qemu. Nor the discard dance since qemu at the source knows what blocks are in use (via bitmap or zero-detection).
Also qemu can copy the data up-front so performance stays consistent.