Comment 2 for bug 1508907

Ok so I spawned enough instances to cover all the "local disk space" which is actually Cinder volumes counted as local hypervisor disk and now when I have filled it up all new created instances will fail because of "not enough disk space".

2016-01-07 15:34:13.642 23722 INFO nova.filters [req-0a2e28cd-07f6-4dfc-8d7c-7f925996b6c6 212f451de64b4ae89c853f1430510037 e47ebdf3f3934025b37df3b85bdfd565 - - -] Filter DiskFilter returned 0 hosts
2016-01-07 15:34:13.643 23722 INFO nova.filters [req-0a2e28cd-07f6-4dfc-8d7c-7f925996b6c6 212f451de64b4ae89c853f1430510037 e47ebdf3f3934025b37df3b85bdfd565 - - -] Filtering removed all hosts for the request with reservation ID 'r-k90hlv14' and instance ID '5fb489a3-03ab-494f-87fa-af0d86b61544'. Filter results: ['RetryFilter: (start: 4, end: 4)', 'AvailabilityZoneFilter: (start: 4, end: 4)', 'RamFilter: (start: 4, end: 4)', 'DiskFilter: (start: 4, end: 0)']

This needs to be elevanted since this corners a deployment into a critical state where no new instances can be spawned.