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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

*** This bug is a duplicate of bug 1750618 ***
    https://bugs.launchpad.net/bugs/1750618

OK I found something which might be the reason you're hitting this.

There was a fix that was backported to newton upstream:

https://review.opendev.org/#/q/I11746d1ea996a0f18b7c54b4c9c21df58cc4714b

Which causes a regression which was fixed and backported through to
ocata but not newton because newton was end of life at that point:

https://review.opendev.org/#/q/I7fde8ce9dea16679e76b0cb2db1427aeeec0c222

So it looks like you'd need to backport that ocata fix to your internal
newton branch:

https://review.opendev.org/#/c/550560/

** This bug has been marked a duplicate of bug 1750618
   rebuild to same host with a different image results in erroneously doing a Claim

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https://bugs.launchpad.net/bugs/1835379

Title:
  rebuild instance will require additional resource on current compute
  node

Status in OpenStack Compute (nova):
  Incomplete

Bug description:
  Hi,
  I have a question about resource claim during instance rebuild.

  Description
  ===========
  We have a stack with two VMs (each flavor is 2 vCPU) located on compute node A, and after that, compute node A now has only 1 vCPU left free.

  Then, try to rebuild VM1.

  
  Expected result
  ===============
  VM1 rebuild successfully.

  
  Actual result
  =============

  VM1 rebuild failed.
  The fault message looks like:
  "Build of instance xxxx aborted: Insufficient compute resources: Free vcpu 1.00 VCPU < requested 2 VCPU."

  
  It seems rebuild will claim resource on the current compute node A with same flavor (i.e. 2 vCPU), right?
  Since there is only 1 vCPU left, VM1 rebuild failed, and VM1's status became "Error".

  Is this the expected behavior? If so, it means instance rebuild
  requires additional resources, correct?

  And a further question is, if we rebuild these two VMs together, will
  the resource claim occurred one by one for each instance, or claim all
  at the same time (that is double of all VMs to be rebuilt on this
  host)?


  Environment
  ===========
  Openstack Newton

  
  Please help to clarify.
  Thank you.

  Qian

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