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virt-install and virt-manager both default to explicitly setting "io='native'" in the disk "driver" tag. virsh, however, does not and also does not provide an option to specify that setting at all. As a result, disks use a different IO mechanism (the default, "threads") when attached post-setup using virsh. Adding this option allows users to keep disk performance consistent for disks attached at install, and those attached afterward.
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>