** Changed in: nova
Assignee: Matt Riedemann (mriedem) => (unassigned)
** Changed in: nova
Status: In Progress => Triaged
** Also affects: nova/stein
Importance: Undecided
Status: New
** Also affects: nova/train
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1816034
Title:
Ironic flavor migration and default resource classes
Status in OpenStack Compute (nova):
Triaged
Status in OpenStack Compute (nova) rocky series:
Triaged
Status in OpenStack Compute (nova) stein series:
New
Status in OpenStack Compute (nova) train series:
New
Bug description:
The Ironic flavor migration to use resource classes happened in
Pike/Queens.
The flavors and the instances needed to be upgraded with the correct resource
class.
This was done by an online data migration.
Looking into Rocky code: ironic.driver._pike_flavor_migration
There is also an offline data migration using nova-manage.
These migrations added the node resource class into
instance_extra.flavor however I don't see that they also included the
default resource classes (VCPU, MEMORY_MB, DISK_GB) set to 0.
Looking into Rocky code there is also a TODO in _pike_flavor_migration:
"This code can be removed in Queens, and will need to be updated to also
alter extra_specs to zero-out the old-style standard resource classes of VCPU,
MEMORY_MB, and DISK_GB."
Currently all my Ironic instances have the correct node resource class
defined, but "old" instances (created before the flavor migration)
don't have VCPU, MEMORY_MB, DISK_GB set to 0, in
instance_extra.flavor.
In Rocky the resource tracker raises the following message:
"There was a conflict when trying to complete your request.\n\n Unable to
allocate inventory: Inventory for 'VCPU' on resource provider XXXX invalid. ",
"title": "Conflict"
because it tries to update the allocation but the inventory doesn't
have vcpu resources.
---
As mitigation we now have: "requires_allocation_refresh = False" in the
Ironic Driver.
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