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[Stephen Finucane <sfinucan@xxxxxxxxxx>]

Public bug reported:

This was originally reported in Bugzilla.

When attempting to resize a instance where the new flavor uses a
different pagesize to the old flavor, the 'NUMATopologyFilter' evaluates
hosts using the original pagesize value rather than the new one.

Steps to Reproduce:

1. Create an instance with 2M hugepage size by setting flavor property: hw:mem_page_size=2048
2. Make sure every other compute node is configured with 1G huge pages
3. Create a new flavor with the property: hw:mem_page_size=1048576
4. Resize the instance as " openstack server resize --flavor <new flavor UUID> <instance UUID>"

Expected results:

Resize operation rebuilds the instance just like cold-migration. It
should be able to apply all aspects of the new flavor.

Actual results:

Resize will fail wit the error message: "Host does not support requested
memory pagesize. Requested: 2048 kB _numa_fit_instance_cell
/usr/lib/python2.7/site-packages/nova/virt/hardware.py:936"

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1831269

Title:
  Resize ignores mem_page_size in new flavor

Status in OpenStack Compute (nova):
  New

Bug description:
  This was originally reported in Bugzilla.

  When attempting to resize a instance where the new flavor uses a
  different pagesize to the old flavor, the 'NUMATopologyFilter'
  evaluates hosts using the original pagesize value rather than the new
  one.

  Steps to Reproduce:

  1. Create an instance with 2M hugepage size by setting flavor property: hw:mem_page_size=2048
  2. Make sure every other compute node is configured with 1G huge pages
  3. Create a new flavor with the property: hw:mem_page_size=1048576
  4. Resize the instance as " openstack server resize --flavor <new flavor UUID> <instance UUID>"

  Expected results:

  Resize operation rebuilds the instance just like cold-migration. It
  should be able to apply all aspects of the new flavor.

  Actual results:

  Resize will fail wit the error message: "Host does not support
  requested memory pagesize. Requested: 2048 kB _numa_fit_instance_cell
  /usr/lib/python2.7/site-packages/nova/virt/hardware.py:936"

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