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<title>Understanding RAID volumes</title>

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<h1>Understanding RAID volumes</h1>


<p>The HP Storage Manager supports the following RAID volume types:<br>
    </p>
  </li>
  <ul>
    <li><strong>Simple Volume</strong> - a single disk drive or <a href="gsegment.htm">segment</a>;
      not redundant.<br>
      <br>
      <p><img src="images/hstraid1.gif" width="37" height="32">&nbsp;HostRAID controllers support Simple volumes only.</p>

    </li>
    <li><strong>Spanned Volume</strong> - two or more disk drives or <a href="gsegment.htm">segments</a>
      with the same or different capacity, connected end-to-end. A spanned volume
      offers no redundancy or performance advantage over a single drive.<br>
      <br>
    </li>
    <li><strong>RAID Volume</strong> - two or more logical devices with the same
      RAID level, connected end-to-end. The logical devices may have the same or
      different capacity and are <strong>not</strong> <a href="cstripe.htm">striped</a>
      together; they may be redundant, depending on the RAID level.<br>
      <br>
      <b><img src="images/note.gif" width="15" height="17"> Notes</b>:
<ol><li>

      You must create the individual logical drives before you create a RAID Volume. Use
      the <a href="wwizpacc.htm">Configuration wizard</a> to create the logical drives; then, run the Configuration
      wizard again to create the RAID Volume.</li><br>
      <li>When you create a RAID Volume, the HP Storage Manager replaces the individual logical devices with a single RAID Volume icon in
      the Logical devices view; then, it reports the logical devices as deleted in the event viewer.
      The event message is normal and does not indicate a loss of data.
      </li></ol>
    </li>
  </ul>

<h2>More information</h2>

<ul>
  <li><a href="craidint.htm">Understanding RAID technology</a></li>
  <li><a href="cstripe.htm">Understanding stripe size</a></li>
  <li><a href="cselraid.htm">Selecting a RAID level</a> </li>
  <li><a href="craid0.htm">RAID level-0</a></li>
  <li><a href="craid1.htm">RAID level-1</a></li>
  <li><a href="craid5.htm">RAID level-5</a></li>
  <li><a href="craid6.htm">RAID level-6</a></li>
  <li><a href="craidx0.htm">RAID level-x0</a> </li>
</ul>

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