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Currently, if we want to zero out disk source (e,g, due to startupPolicy when starting up a domain) we use virDomainDiskSetSource(disk, NULL). This works well for file based storage (storage type file, dir, or block). But it doesn't work at all for other types like volume and network. So imagine that you have a domain that has a CDROM configured which source is a volume from an inactive pool. Because it is startupPolicy='optional', the CDROM is empty when the domain starts. However, the source element is not cleared out in the status XML and thus when the daemon restarts and tries to reconnect to the domain it refreshes the disks (which fails - the storage pool is still not running) and thus the domain is killed. Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>