2013/5/8 Eric Blake <eblake@redhat.com>

On 05/08/2013 01:58 AM, Daniele wrote:

[please don't top-post on technical lists]

> Hi Eric, so I will try to downgrade libvirt in the source host back to the
> 0.9.8 version. To completely remove libvirt is enough to run the apt-get
> command with the purge option?

Unfortunately, I don't use debian enough to know how to downgrade.
Also, 0.9.8 is rather old, you really ought to consider using newer
libvirt, such as 1.0.5, just because of the improvements it has (I guess
I don't understand why Debian favors such an old version of software).

But if you DO downgrade, be aware that you will have to stop your guest
and then restart it before your guest will be running under the older
qemu. But if you are going to stop your guest, then you can get away
with offline migration (much simpler, as it can work in spite of qemu
version mismatch) - that is, live migration is only useful if you are
trying to avoid powering down your guest. Conversely, if you are going
to insist on live migration because your guest cannot suffer from
downtime, then upgrading qemu is your only option.

I downgraded libvirt so now I have the same version both in the source and the destination host.

Now this is the situation: in one direction (from B to A) there is exactly the same error as before!.. instead from A to B, the direction that before was working, now returns this error: "End of file while reading data: : Input/output error", libvirtd crashes at the destination host, and when i restart it the vm is running (so it runs both in the destination and in the source host simultaneously!)..

weird!