Some Nova virt drivers support migrating to the same host (VMWare at least). That's why it's not meaningless to accept migrating to a same host.
Anyway, given your concern would be asking to have a different behaviour for cold-migrating, it would need a new API microversion hence a new spec and a blueprint. See https://docs.openstack.org/nova/latest/contributor/blueprints.html for details. ** Changed in: nova Status: New => Invalid ** Changed in: nova Importance: Undecided => Wishlist -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1748697 Title: Cold migration fails when the filter only returns the host where the vm is located and the vm status is set to ERROR Status in OpenStack Compute (nova): Invalid Bug description: Description =========== The configuration: allow_resize_to_same_host=True. Cold migration fails when the filter only returns the host where the vm is located and the vm status is set to ERROR. Steps to reproduce ================== 1、create a vm 2、disable all hosts except the host which the vm is located 3、cold migrate the vm, you can see the exception.UnableToMigrateToSelf in compute log, and the vm status is set to ERROR while it still running Expected result =============== cold migrate failed, and user should see HTTP400 NovaildHost from console output, because cold migrate to same host is meaningless. The vm status still keep Active. Actual result ============= cold migrate failed, nothing returns from console, and vm status is set to ERROR. Environment =========== nova16.0.4 KVM $ libvirt Logs & Configs ============== allow_resize_to_same_host=True PS: If the host which the vm located is particularly resource-rich, filters return this host each time when user executes cold migration. Even if the resources of other hosts can meet the requirements of the virtual machine, the vm can never be cold-migrated. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1748697/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp