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---
upgrade:
- |
When using file-backed memory, the ``nova-compute`` service will now fail
to start if the amount of reserved memory configured using ``[DEFAULT]
reserved_host_memory_mb`` is equal to or greater than the total amount of
memory configured using ``[libvirt] file_backed_memory``. Where reserved
memory is less than the total amount of memory configured, a warning will
be raised. This warning will become an error in a future release.
The former combination is invalid as it would suggest reserved memory is
greater than total memory available, while the latter is considered
incorrect behavior as reserving of file-backed memory can and should be
achieved by reducing the filespace allocated as memory by modifying
``[libvirt] file_backed_memory``.
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