Description of problem:

From the customer:

  It might be useful to have the ability to override default volume options on storage pool level. For example: For a storage pool which is providing only SSL encrypted storage.  So having client.ssl 'on', server.ssl 'on' turned on by default will save two gluster volume set commands after creating each volume. Imagine automated script provisioning 100 volumes. This will significantly reduce number of gluster volume * executions.

If I understand the request correctly, they're asking if something like:

  # gluster volume set all | default ssl on

  Which would implicitly set client.ssl and server.ssl on for all volumes in the storage pool, and similar 'all | default' options for other defaults to be set for all volumes.