Re: [libvirt] [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage

> -----Original Messages----- > From: "Stefan Hajnoczi" <stefanha(a)gmail.com&gt; > Sent Time: 2019-01-09 20:42:58 (Wednesday) > To: wuzhouhui <wuzhouhui14(a)mails.ucas.ac.cn&gt; > Cc: qemu-devel(a)nongnu.org, xieyongji(a)baidu.com, lilin24(a)baidu.com, libvir-list(a)redhat.com, spdk(a)lists.01.org > Subject: Re: [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage > > On Wed, Jan 09, 2019 at 06:23:42PM +0800, wuzhouhui wrote: > > Hi everyone, > > > > I'm working qemu with vhost target (e.g. spdk), and I attempt to migrate VM with > > 2 local storages. One local storage is a regular file, e.g. /tmp/c74.qcow2, and > > the other is a malloc bdev that spdk created. This malloc bdev will exported to > > VM via vhost-user-blk. When I execute following command: > > > > virsh migrate --live --persistent --unsafe --undefinesource --copy-storage-all \ > > --p2p --auto-converge --verbose --desturi qemu+tcp://<uri>/system vm0 > > > > The libvirt reports: > > > > qemu-2.12.1: error: internal error: unable to execute QEMU command \ > > 'nbd-server-add': Cannot find device=drive-virtio-disk1 nor \ > > node_name=drive-virtio-disk1 > > Please post your libvirt domain XML. My libvirt is based on libvirt-1.1.1-29.el7, and add many patches to satisfy our own needs, e.g. add support for vhost-user-blk. Post domain xml may not useful.