Re: [question] The source cannot recover, if the destination fails in the last round of live migration

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Kunkun Jiang (jiangkunkun@huawei.com) wrote:
> Hi all,

Hi,

> Recently I am learning about the part of live migration.
> I have a question about the last round.
> 
> When the pending_size is less than the threshold, it will enter
> the last round and call migration_completion(). It will stop the
> source and sent the remaining dirty pages and devices' status
> information to the destination. The destination will load these
> information and start the VM.
> 
> If there is an error at the destination at this time, it will exit
> directly, and the source will not be able to detect the error
> and recover. Because the source will not call
> migration_detect_error().
> 
> Is my understanding correct?
> Should the source wait the result of the last round of destination ?

Try setting the 'return-path' migration capability on both the source
and destination;  I think it's that option will cause the destination to
send an OK/error at the end and the source to wait for it.

Dave

> Thanks,
> Kunkun Jiang
> 
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK