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another options you to expand the storage nodes:

  1. use multi-backend lvm volumes, see more detail in the guide: http://docs.openstack.org/trunk/openstack-block-storage/admin/content/multi_backend.html

  2. select one the stable storage back-end, -> it's easier to extend more storage node dynamically. In my deployment, i'm using ceph likes as the storage back-end. ^.^

Hope they're useful to you ;)