Hi, Currently with VMWare VCDriver, one nova compute can manage multiple clusters/RPs, this caused cluster admin cannot do live migration between clusters/PRs if those clusters/PRs managed by one nova compute as the current live migration logic request at least two nova computes.
A bug [1] was also filed to trace VMWare live migration issue. I'm now trying the following solution to see if it is acceptable for a fix, the fix wants enable live migration with one nova compute: 1) When live migration check if host are same, check both host and node for the VM instance. 2) When nova scheduler select destination for live migration, the live migration task should put (host, node) to attempted hosts. 3) Nova scheduler needs to be enhanced to support ignored_nodes. 4) nova compute need to be enhanced to check host and node when doing live migration. I also uploaded a WIP patch [2] for you to review the idea of the fix and hope can get some comments from you. [1] https://bugs.launchpad.net/nova/+bug/1192192 [2] https://review.openstack.org/#/c/84085 -- Thanks, Jay
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