[Ovirt-devel] Save/Resume Issues

[Ian Main]

Howdy Folks :)

So in my working with taskomatic, I noticed that the save/resume functionality seems a bit broken.  The first thing I noticed was that libvirt itself has no concept of a separate state for 'saved', which ovirt attempts to maintain.  This could work fine but when a node is disconnected and then reconnected, the state will shift to 'unavailable' and then to 'stopped' when it reconnects.  There may be other corner cases where this does not work as well.

The other issue is that it saves the image to /tmp on the local node.  This is usually (always?) a memory based FS and so it will be lost on reboot of the node.  It also does not allow for resume on a different host, and presently is not removed after resume so the FS will eventually fill up with a few save/resume cycles.

To fix all this I'm thinking we should save our images on a designated storage device, using a new field in the vm database to denote that it is saved, perhaps with the path to the saved image.  Once restored or started the image should be deleted.

	Ian