-``spindle_ratio`` to balance the I/O load on the nodes. These two
-parameters will be renamed to ``storage_io_use`` and
-``storage_io_ratio`` to reflect better their meaning. When
-``exclusive_storage`` is enabled, such parameters are ignored, as
-balancing the use of storage I/O is already addressed by the exclusive
-assignment of PVs.
+``spindle_ratio`` to balance the I/O load on the nodes. When
+``exclusive_storage`` is enabled, these parameters as currently defined
+won't make any sense, so their meaning will be changed in this way:
+
+- ``spindle_use`` refers to the resource, hence to the actual spindles
+ (PVs in LVM), used by an instance. The values specified in the instance
+ policy specifications are compared to the run-time numbers of spindle
+ used by an instance. The ``spindle_use`` back-end parameter will be
+ ignored.
+- ``spindle_ratio`` in instance policies and ``spindle_count`` in node
+ parameters are ignored, as the exclusive assignment of PVs already
+ implies a value of 1.0 for the first, and the second is replaced by
+ the actual number of spindles.
+
+When ``exclusive_storage`` is disabled, the existing spindle parameters
+behave as before.