Comment 4 for bug 1768922

Frode Nordahl (fnordahl) wrote :

There is a subtle but critical difference in how Cinder represents a backend located in the [DEFAULT] section to one in a separate section to the rest of OpenStack; `host` vs `host`@`volume_backend_name`.

Any change to this representation affects consumers and their reference to these volumes. In effect they will stop working until the reference is updated to reflect the new location.

This makes it a bit harder to port the sectional config change backwards as it would lead to operational impact on a mere charm upgrade.

There are actions to help migrate once upgraded to Ocata or newer.