How to fix the error of creating typical instances when trying to create TRS instances?¶

When creating TRS instances, an error may appear when some or all of the created instances do not have the TRS attribute. In particular, this can happen when scheduling the creation of TRS Instances via Scheduler. This error is caused by the fact that information about instances that could not be placed on hypervisors is migrated to database nova_cell0, while tags instances in database nova_cell0 are not migrated. Since the TRS feature is determined by the tag, then if there are errors in the creation, they will all lose the TRS tag and be created as standard instances.

To fix the this problem, you need to make sure that you have the changes made in the commit. And if necessary, update the corresponding components Nova.