ALTER DISKGROUP
  { diskgroup_name
      { { { add_disk_clause | drop_disk_clause }
          [, { add_disk_clause | drop_disk_clause } ]...
        | resize_disk_clause
        } [ rebalance_diskgroup_clause ]
      | disk_online_clause
      | disk_offline_clause
      | rebalance_diskgroup_clause
      | check_diskgroup_clause
      | diskgroup_template_clauses
      | diskgroup_directory_clauses
      | diskgroup_alias_clauses
      | diskgroup_volume_clauses
      | diskgroup_attributes
      | modify_diskgroup_file
      | drop_diskgroup_file_clause
      | usergroup_clauses
      | user_clauses
      | file_permissions_clause
      | file_owner_clause
      }
    | { diskgroup_name [, diskgroup_name ] ...
      | ALL
      } { undrop_disk_clause
        | diskgroup_availability
        | enable_disable_volume
        }
  } ;