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Add n-vol to ENABLED_SERVICES in your localrc:

ENABLED_SERVICES=g-api,g-reg,key,n-api,n-cpu,n-net,n-sch,n-vnc,horizon,mysql,rabbit,openstackx,n-vol

If you do this, devstack will look for a volume group named "nova-volumes," and configure nova-volume to run with that. If such a volume group does not exist, it will configure nova-volume with a file-backed volume group of the same name.

As for the second question, we are thinking about adding a flag to devstack that would preserve existing data, so that subsequent runs to stack.sh use your existing configuration. Is that what you have in mind?