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


From: Charles Duffy
Subject: [Qemu-devel] Re: Live migration - exec: support to be reintroduced?
Date: Wed, 05 Nov 2008 12:10:04 -0600
User-agent: Thunderbird 2.0.0.17 (X11/20080925)

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.





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