Comment 4 for bug 1749544

To not run into this issue either:

1. Use hardware that complies with ceph recommended practices
2. Override the defaults if using a development or test-only environment

In order to make #2 easier, simply use '-e environments/low-memory-usage.yaml' with your deployment and after the proposed change to this file merges, the issue should go away.

 https://review.openstack.org/#/c/544588/