[Qemu-devel] Re: Live migration - exec: support to be reintroduced?

[Charles Duffy <Charles_Duffy@messageone.com>]

Anthony Liguori wrote:
> Daniel P. Berrange wrote:
>> This isn't for snapshotting, so checkpointing of storage is unneccessary.
>> This is just straight save+restore, akin to hibernate-to-disk for a 
>> physical machine.   
> 
> This is a fundamentally broken concept.  You cannot just save the 
> guest's memory state without saving the current state of the storage.

You're requiring the user to manage storage checkpointing themselves in 
this case -- but whether they're using LVM snapshotting or replacing the 
qcow2 backend with an empty file backed by the old store, the user may 
choose to do that themselves rather than pushing the work off to qemu 
(and forcing everything to be stored in a single file); I use (and wish 
not to lose) this functionality myself.