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.