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https://bugzilla.redhat.com/show_bug.cgi?id=1161617 Add command to allow adding and removing IOThreads from the domain including the configuration and live domain. $ virsh iothreadadd --help NAME iothreadadd - add an IOThread to the guest domain SYNOPSIS iothreadadd <domain> <id> [--config] [--live] [--current] DESCRIPTION Add an IOThread to the guest domain. OPTIONS [--domain] <string> domain name, id or uuid [--id] <number> iothread for the new IOThread --config affect next boot --live affect running domain --current affect current domain $ virsh iothreaddel --help NAME iothreaddel - delete an IOThread from the guest domain SYNOPSIS iothreaddel <domain> <id> [--config] [--live] [--current] DESCRIPTION Delete an IOThread from the guest domain. OPTIONS [--domain] <string> domain name, id or uuid [--id] <number> iothread_id for the IOThread to delete --config affect next boot --live affect running domain --current affect current domain Assuming a running $dom with multiple IOThreads assigned and that that the $dom has disks assigned to IOThread 1 and IOThread 2: $ virsh iothreadinfo $dom IOThread ID CPU Affinity --------------------------------------------------- 1 2 2 3 3 0-1 $ virsh iothreadadd $dom 1 error: invalid argument: an IOThread is already using iothread_id '1' in iothreadpids $ virsh iothreadadd $dom 1 --config error: invalid argument: an IOThread is already using iothread_id '1' in persistent iothreadids $ virsh iothreadadd $dom 4 $ virsh iothreadinfo $dom IOThread ID CPU Affinity --------------------------------------------------- 1 2 2 3 3 0-1 4 0-3 $ virsh iothreadinfo $dom --config IOThread ID CPU Affinity --------------------------------------------------- 1 2 2 3 3 0-1 $ virsh iothreadadd $dom 4 --config $ virsh iothreadinfo $dom --config IOThread ID CPU Affinity --------------------------------------------------- 1 2 2 3 3 0-1 4 0-3 Assuming the same original configuration $ virsh iothreaddel $dom 1 error: invalid argument: cannot remove IOThread 1 since it is being used by disk 'vde' $ virsh iothreaddel $dom 3 $ virsh iothreadinfo $dom IOThread ID CPU Affinity --------------------------------------------------- 1 2 2 3 $ virsh iothreadinfo $dom --config IOThread ID CPU Affinity --------------------------------------------------- 1 2 2 3 3 0-1
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>