These known issues exist in Red Hat OpenStack at this time:
Scaling up from 0 Ceph Storage nodes is not supported
When using Red Hat Ceph as a back end for ephemeral storage, the Compute service does not calculate the amount of available storage correctly. Specifically, Compute simply adds up the amount of available storage without factoring in replication. This results in grossly overstated available storage, which in turn could cause unexpected storage oversubscription.
To determine the correct ephemeral storage capacity, query the Ceph service directly instead.
At current, dhcpv6 on interfaces cannot be disabled by using nic templates, making it impossible to control IP assignment and IPv6 routes on interfaces connected to a network that runs a dhcpv6 server. As a workaround, add the following to /etc/sysconfig/network-scripts/ifcfg-eth4:
When using Red Hat Ceph Storage as a back end for both Block Storage (cinder) volumes and backups, any attempt to perform an incremental backup will result in a full backup instead, without any warning.