Shelf IDs must be unique for each SAS disk shelf within each MetroCluster DR group (including both sites).
Note: Do not cable disk shelves
intended to contain unimirrored aggregates at this time. You must wait to
deploy shelves intended for unmirrored aggregates until after the
MetroCluster configuration is complete and only deploy them after using the
metrocluster modify
-enable-unmirrored-aggr-deployment true command.