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<h1>Recovering from failed drives</h1>
<p>If the failed drives are not part of an pool, contact your service representative.
</p>
<p>If a physical drive fails in an pool or multiple physical drives fail in separate
  pools (one physical drive per array), complete the following steps:
<ol type=1>
  <li>Replace each failed physical drive. The controller starts the
    rebuild operation when it detects the removal and reinsertion of a drive that
    is part of an pool.<br>
    <br>
    <img src="images/note.gif" width="15" height="17"><b> Note:</b> (For a configuration
    that contains a hot-spare drive) If you replace a failed physical drive, it
    is not necessary to position the new physical drive on the same SCSI channel
    and SCSI ID as the original hot-spare drive. The replacement physical drive
    is automatically incorporated into the configuration as a hot-spare drive.
    Here is an example of how this works: <br>
    <br>
    <ol>
      <li>The original configuration consists of a RAID level-5 logical device
        composed of four physical drives. The physical drives are connected to
        SCSI channel 1; they are assigned SCSI IDs 0, 1, 2, and 3. SCSI ID 3 is
        a hot-spare drive. <br>
        <br>
      </li>
      <li>The physical drive at Channel 1, SCSI ID 2, fails; the logical device
        enters the degraded state. <br>
        <br>
      </li>
      <li>The hot-spare drive at Channel 1, SCSI ID 3, is rebuilt into the pool.
        <br>
        <br>
      </li>
      <li>You remove the failed physical drive at Channel 1, SCSI ID 2, and replace
        it with a new physical drive. The new physical drive at Channel 1, SCSI
        ID 2, is automatically assigned to be a hot-spare drive. <br>
        <br>
      </li>
    </ol>
  </li>
  <li>If a rebuild operation is in progress, wait until the rebuild is complete.
    Otherwise, go to step 3.<br>
    <br>
    <img src="images/note.gif" width="15" height="17"><b> Note:</b> If you are
    replacing multiple failed drives, you must wait for each rebuild operation
    to complete before starting subsequent rebuild operations. <br>
    <br>
  </li>
  <li>Verify the cables, physical drives, and controllers are installed properly.
    <br>
    <br>
  </li>
  <li>Attempt to rebuild the failed physical drive by <a href="cfixddd2.htm">performing
    a hot-swap rebuild</a>. <br>
    <br>
  </li>
  <li>If the hot-swap rebuild fails, contact your service representative.
  </li>
</ol>
<p>
<h2>More information</h2>

<ul>
  <li><a href="cfixddd.htm">Rebuilding a failed drive</a></li>
  <li><a href="cfixddd2.htm">Rebuilding a hot-swap drive</a></li>
  <li><a href="arbddd.htm">Manually rebuilding a failed drive</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="craidx0.htm">RAID level-x0</A> </LI>
</ul>

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