How can I use multiple Cinder sources?

Question

Is there a way to have multiple cinder sources and have this represented in juju?

I know you can deploy multiple neutron-gateways, but I was hoping to create a SSD ceph / cinder source, as well as a non SSD ceph/cinder source

Answer 1

This can be done by deploying the cinder-backend of your choice multiple times. For example: if you had two physical EMC VNX backends you would deploy the cinder-vnx charm twice:

juju deploy cinder-vnx backend-alpha
juju deploy cinder-vnx backend-beta

When you reconfigured and related these two backends to cinder they'd each get their own stanza in the cinder configuration:

juju add-relation cinder backend-alpha
juju add-relation cinder backend-beta

You'll need to find the Cinder plugin charm you're using, deploy it and configure them to point one at SSD and the other at your spinning disks, name them maybe backend-fast and backend-slow (or any name, doesn't even have to be prefixed with backend) relate them to cinder and you've got two backends in cinder ready for consumption.