Resize or Migrate Operations Failing With HTTP 409 Error "Service is unavailable at this time"
Problem
When a resize or migrate operation is being performed, the operation fails with the following error.

Environment
- Platform9 Managed OpenStack - v5.3 and higher
- Nova
Cause
As a part of the v5.3 release, Nova was upgraded to the Ussuri release. This release contains a fix for bug #1856925 where the resize and migrate server actions will be rejected with a HTTP 409 response if the source compute is down.
Resolution
- Identify the source host for the migrate or the resize operation.
- Check the compute service for any errors and restart the pf9-ostackhost service.
Additional Information
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