For background, this was discussed in bug 1750623 and deemed to be a
separate bug which requires its own fix. As far as I can tell, this has
been a problem since NUMA support was added, which I think was Juno.
** Changed in: nova
Status: New => Triaged
** Changed in: nova
Importance: Undecided => Medium
** Also affects: nova/pike
Importance: Undecided
Status: New
** Also affects: nova/ocata
Importance: Undecided
Status: New
** Also affects: nova/queens
Importance: Undecided
Status: New
** Changed in: nova/ocata
Status: New => Confirmed
** Changed in: nova/pike
Status: New => Confirmed
** Changed in: nova/ocata
Importance: Undecided => Medium
** Changed in: nova/queens
Importance: Undecided => Medium
** Changed in: nova/queens
Status: New => Confirmed
** Changed in: nova/pike
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1763766
Title:
nova needs to disallow topology changes on image rebuild
Status in OpenStack Compute (nova):
Triaged
Status in OpenStack Compute (nova) ocata series:
Confirmed
Status in OpenStack Compute (nova) pike series:
Confirmed
Status in OpenStack Compute (nova) queens series:
Confirmed
Bug description:
When doing a rebuild the assumption throughout the code is that we are
not changing the resources consumed by the guest (that is what a
resize is for). The complication here is that there are a number of
image properties which might affect the instance resource consumption
(in conjunction with a suitable flavor):
hw_numa_nodes=X
hw_numa_cpus.X=Y
hw_numa_mem.X=Y
hw_mem_page_size=X
hw_cpu_thread_policy=X
hw_cpu_policy=X
Due to the assumptions made in the rest of the code, we need to add a
check to ensure that on a rebuild the above image properties do not
differ between the old and new images.
While they might look suspicious, I think that the following image properties
*should* be allowed to differ, since they only affect the topology seen by the
guest:
hw_cpu_threads
hw_cpu_cores
hw_cpu_sockets
hw_cpu_max_threads
hw_cpu_max_cores
hw_cpu_max_sockets
hw_cpu_realtime_mask
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