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<title>Things to consider when changing the RAID level</title>

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<h1>Things to consider when changing the RAID level</h1>

<table width="595" border="2" cellpadding="5">
  <tr valign=top bgcolor="#C0C0C0">
    <td width="150"><b>If you have a...</b></td>
    <td width="125"><b>And you want...</b></td>
    <td><b>Then...</b></td>
  </tr>
  <tr valign=top>
    <td width="150"><a href="craid0.htm">RAID level-0</a> logical device with
      two or more drives</td>
    <td width="125"><a href="craid5.htm">RAID level-5</a></td>
    <td>Add at least one drive</td>
  </tr>
  <tr valign=top>
    <td width="150"> <p>RAID level-5 logical device</p></td>
    <td width="125">RAID level-0</td>
    <td>Optionally, remove one drive</td>
  </tr>
  <tr valign=top>
    <td width="150"> <p>RAID level-0 logical device</p></td>
    <td width="125"><a href="craidx0.htm">RAID level-10</a></td>
    <td><strong>Double</strong> (at least) the drive count</td>
  </tr>
  <tr valign=top>
    <td><a href="craid6.htm">RAID level-6</a> logical device</td>
    <td>RAID level-5</td>
    <td>Optionally, remove one drive</td>
  </tr>
  <tr valign=top>
    <td>RAID level-5 logical device</td>
    <td><a href="craid5ee.htm">RAID level-5EE</a></td>
    <td>Add at least one drive</td>
  </tr>
    <tr valign=top>
      <td>RAID level-5 logical device</td>
      <td>RAID level-6</td>
      <td>Add one or two drives (second drive may be necessary to support N data + 2 parity drives)</td>
    </tr>
  <tr valign=top>
    <td>RAID level-5EE logical device</td>
    <td>RAID level-5</td>
    <td>Optionally, remove one drive</td>
  </tr>
  <tr valign=top>
    <td>RAID level-5 logical device</td>
    <td>RAID level-10</td>
    <td>Make sure you have (source-1)*2 drives total</td>
  </tr>
  <tr valign=top>
    <td> <p><a href="craid1.htm">RAID level-1</a> logical device</p></td>
    <td>RAID level-5</td>
    <td>Add at least<b></b> one drive</td>
  </tr>
  <tr valign=top>
    <td width="150"> <p>RAID level-1 logical device</p></td>
    <td width="125">RAID level-10</td>
    <td>Add at least two drives</td>
  </tr>
</table>

<h2>More information</h2>
<ul>
  <li><a href="achgrlcc.htm">Changing the RAID level  (action)</a></li>
  <li><a href="cldmigra.htm">Understanding logical-drive migration</a></li>
</ul>

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