TSM Backup Driver Enhancements

Gerrit topic: https://review.openstack.org/#q,topic:bp/tsm-backup-driver-enhancement,n,z

Addressed by: https://review.openstack.org/73456
    TSM backup driver changes to support file backup

<jgriffith>
Please note https://wiki.openstack.org/wiki/FeatureProposalFreeze

This is way late to be proposing new features.

<jgriffith>
Jay Bryant from IBM pointed out that you'd been working with him on this for a while and the official cut-off is in fact not until the 18'th so I suppose this should be approved.

<bill_az>
John, my bad for submitting this so late. I interpreted "FeatureProposalFreeze (Feb 18)" shown here https://wiki.openstack.org/wiki/Icehouse_Release_Schedule as being the last date to submit blue prints.

Also, we had some discussion as to whether this was really a new feature or a bug because the "feature" was to make the backup driver work with file based volume drivers as well as block based.

Thanks for your consideration/patience!

<dosaboy>
I missed this when I created https://blueprints.launchpad.net/cinder/+spec/implement-tsm-metadata-backup-support. If there is overlap in the objective can we clarify and close the new BP if it is redundant. Thanks.

<bill_az>
This blue print only deals with extensions to TSM driver to support file backed volumes. The goal of these changes are that any cinder volume can be backed up using TSM driver, regardless of the storage architecture used in the volume backend. There is no overlap with the implement-tsm-metadata-backup-support bp.