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We use device-mapper to enumerate all dm devices, and filter out the list of multipath devices by checking the target_type string name. The code however cancels all scanning if we encounter target_type=NULL I don't know how to reproduce that situation, but a user was hitting it in their setup, and inspecting the lvm2/device-mapper code shows many places where !target_type is explicitly ignored and processing continues on to the next device. So I think we should do the same https://bugzilla.redhat.com/show_bug.cgi?id=1069317
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>
Description
Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.
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