Add section about the multi-volume support in sysinstall.

svn path=/head/; revision=24120

en_US.ISO8859-1/articles/releng/article.sgml

@@ -755,6 +755,22 @@
         creation of these discs is provided in the &art.re.pkgs;
         article.</para>
     </sect3>
+
+    <sect3>
+      <title>Multi-volume support</title>
+
+      <para><application>Sysinstall</application> supports multiple
+        volume package installations.  This requires that each disc
+        have an <filename>INDEX</filename> file containing all of the
+        packages on all volumes of a set, along with an extra field
+        that indicates which volume that particular package is on.
+        Each volume in the set must also have the
+        <literal>CD_VOLUME</literal> variable set in the
+        <filename>cdrom.inf</filename> file so that sysinstall can
+        tell which volume is which.  When a user attempts to install a
+        package that is not on the current disc, sysinstall will
+        prompt the user to insert the appropriate one.</para>
+    </sect3>
   </sect2>
 </sect1>