Adds a clarifying statement re: partition meaning

fixes bug 1033903

Have encountered several people who have been confused into creating some
huge amount of (physical) disk partitions by the text following this
change. So the idea here is to add a clarifying note so there is no
ambiguity about what "partition" means in this section.

Change-Id: Ieea81d8f1aad8ddf0f31697d4c2cd54a8b0c288d

doc/src/docbkx/openstack-object-storage-admin/objectstorageadmin.xml

@@ -115,6 +115,12 @@ designing the network for a Swift cluster.</para>
     <section xml:id="preparing-the-ring">
 
 <title>Preparing the Ring</title>
+<note><title>Note</title><para>"Partition" in this section refers to the logical
+partitions of the swift ring - not physical partitions on Storage node drives.
+You should setup your Storage Node disk partitions with one physical partition
+ per disk, as per the 
+<link linkend="installing-and-configuring-storage-nodes">installation instructions</link>
+.</para></note>
 <para>The first step is to determine the number of partitions that will be in the
 ring. We recommend that there be a minimum of 100 partitions per drive to
 insure even distribution across the drives. A good starting point might be