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[WANG Qian <1835379@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

Say we have a stack with two VMs (each flavor is 2 vCPU) located on
compute node A, and now compute node A has only 1 vCPU left free.

Then, try to rebuild VM1, it 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 will fail, and VM1's status will be "Error".
The fault message looks like:
"Build of instance xxxx aborted: Insufficient compute resources: Free vcpu 1.00 VCPU < requested 2 VCPU."

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)?

Please help to clarify.
Thank you.

Qian

** Affects: nova
     Importance: Undecided
         Status: New

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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):
  New

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

  Say we have a stack with two VMs (each flavor is 2 vCPU) located on
  compute node A, and now compute node A has only 1 vCPU left free.

  Then, try to rebuild VM1, it 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 will fail, and VM1's status will be "Error".
  The fault message looks like:
  "Build of instance xxxx aborted: Insufficient compute resources: Free vcpu 1.00 VCPU < requested 2 VCPU."

  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)?

  Please help to clarify.
  Thank you.

  Qian

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