Open Stack

There are two concepts that I would like Nova Volumes to support:

1.  Allow different storage classes within a storage driver.  For
example, in our case we will have some nodes with high iops
capabilities and other nodes for cheaper/larger  volumes.

2.  Allow for different storage backends to be used and specified by
the user.  For example, you might want to use both the Lunr volume
backend, and one of the SAN backends.

I think having the idea of a volume type when creating a volume would
support both of these features.  I have started a blueprint and spec
below, and would like to solicit feedback.

Blueprint: https://blueprints.launchpad.net/nova/+spec/volume-type
Spec: http://etherpad.openstack.org/volume-type

Please let me know what you think, and if you have any questions.

--
Chuck