Re: unable to migrate non shared storage in tunneled mode

On Mon, Aug 17, 2020 at 3:24 AM Peter Krempa <pkrempa(a)redhat.com&gt; wrote: > > On Sat, Aug 15, 2020 at 15:38:19 -0700, Vjaceslavs Klimovs wrote: > > Hey all, > > With libvirt 6.5.0 and qemu 5.1.0 migration of non shared disks in > > tunneled mode does not work for me: > > > > virsh # migrate alpinelinux3.8 qemu+tls://ratchet.lan/system --live > > --persistent --undefinesource --copy-storage-all --tunneled --p2p > > error: internal error: qemu unexpectedly closed the monitor: Receiving > > block device images > > Error unknown block device > > 2020-08-15T21:21:48.995016Z qemu-system-x86_64: error while loading > > state section id 1(block) > > 2020-08-15T21:21:48.995193Z qemu-system-x86_64: load of migration > > failed: Invalid argument > > > > This is both with UEFI and BIOS guests. > > The migration of storage using the qemu migration stream is not > supported by qemu when -blockdev is used. Since we can only transport > one stream when migrating with '-tunelled', it's no longer possible to > combine those two. Unfortunately automagic block migration was deemed a > legacy feature. > > > > I understand that newer ways of migrating non shared disks is via NBD > > directly with QEMU, however I am certain > > that this used to work before libvirt 6.0. There is a series of > > commits to /src/qemu/qemu_migration.c on Dec 8, 2019, > > could they have something to do with this? > > I presume those are my commits which fix the NBD migration though. > Unfortunately they can't fix the old one. > > > Is migration of non shared disks supported and supposed to work in > > tunneled mode or is it not a supported configuration > > and native NBD directly with QEMU should be used in all cases? > > NBD should be used nowadays. The old style storage migration was > neglected for a very long time now. > Thank you for the clarification, very helpful. Local libvirtd of course knows about --tunneled and -blockdev being used - would it be possible for it to provide a clear error message that this combination is not supported when such migration is attempted?