Re: unable to migrate non shared storage in tunneled mode

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.