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Since the name (like scsi_host10) is not stable for vHBA, (it can be changed either after recreating or system rebooting), current API virNodeDeviceLookupByName is not nice to use for management app in this case. (E.g. one wants to destroy the vHBA whose name has been changed after system rebooting, he has to find out current name first). Later patches will support the persistent vHBA via storage pool, with which one can identify the vHBA stably by the wwnn && wwpn pair. So this new API comes.
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>