Modify indexterms to be more consistent with other disk-related index

entries in other chapters.  Remove some rendundant indexterms.  Thanks
to Hiten for indexing this in the first place.

en_US.ISO8859-1/books/handbook/vinum/chapter.sgml

@@ -45,8 +45,8 @@
     <title>Disks are too small</title>
 
     <indexterm><primary>Vinum</primary></indexterm>
-    <indexterm><primary>Volume</primary>
-    <secondary>Manager</secondary></indexterm>
+    <indexterm><primary>RAID</primary>
+    <secondary>Software</secondary></indexterm>
     
     <para><emphasis>Vinum</emphasis> is a
       so-called <emphasis>Volume Manager</emphasis>, a virtual disk driver that
@@ -106,8 +106,7 @@
       higher than on another.</para>
 
     <indexterm>
-      <primary>concatenation</primary>
-      <secondary>Vinum</secondary>
+      <primary>disk concatenation</primary>
     </indexterm>
     <indexterm>
       <primary>Vinum</primary>
@@ -138,8 +137,7 @@
     </para>
 
     <indexterm>
-      <primary>striping</primary>
-      <secondary>Vinum</secondary>
+      <primary>disk striping</primary>
     </indexterm>
     <indexterm>
       <primary>Vinum</primary>
@@ -154,13 +152,7 @@
       <emphasis>striping</emphasis> or <acronym>RAID-0</acronym>
 
     <footnote>
-      <indexterm>
-	<primary>RAID</primary>
-      </indexterm>
-      <indexterm>
-	<primary>Redundant</primary>
-	<secondary>Array of Inexpensive Disks</secondary>
-      </indexterm>
+      <indexterm><primary>RAID</primary></indexterm>
     
       <para><acronym>RAID</acronym> stands for <emphasis>Redundant Array of
       Inexpensive Disks</emphasis> and offers various forms of fault tolerance,
@@ -190,17 +182,12 @@
 	disk drive and restoring data to it can take days.</para>
 
       <indexterm>
-	<primary>mirroring</primary>
-	<secondary>Vinum</secondary>
+	<primary>disk mirroring</primary>
       </indexterm>
       <indexterm>
 	<primary>Vinum</primary>
 	<secondary>mirroring</secondary>
       </indexterm>
-      <indexterm>
-	<primary>RAID</primary>
-	<secondary>level 1</secondary>
-      </indexterm>
       <indexterm>
 	<primary>RAID-1</primary>
       </indexterm>
@@ -686,7 +673,7 @@
       of volumes, plexes and subdisks may be up to 64 characters long, and the
       names of drives may be up to 32 characters long.</para>
 
-    <para><indexterm><primary>/dev/vinum</primary></indexterm>Vinum objects
+    <para>Vinum objects
       are assigned device nodes in the hierarchy <filename>/dev/vinum</filename>.
       The configuration shown above would cause Vinum to create the following
       device nodes:</para>