<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Rebuilding a hot-swap drive</TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1"><BASE
target=_top><LINK href="basicpg.css" rel=stylesheet>
<META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD>
<BODY text=#000000 vLink=#333399 aLink=#0000ff link=#0000ff bgColor=#ffffff>
<H1>Rebuilding a hot-swap drive</H1>
<P>A hot-swap rebuild refers to a rebuild operation that is started by the
controller when it detects that a drive that is part of an pool and
 in the failed state has been removed and reinserted on the SCSI cable or
backplane. The reinsertion of the physical drive, whether it is the same drive
or a new drive, will trigger the controller to start the rebuild
operation. During the rebuild operation, the drive being rebuilt is in the
rebuild state, and the logical device remains degraded until the rebuild
operation has been successfully completed. </P>
<P>On most servers, when a hot-spare drive is available, the rebuild operation
begins automatically without the need to replace the failed drive. If more than
one drive fails within the same pool, no rebuild takes place. If multiple
drives fail in separate pools (one physical drive per array), the controller
initiates a rebuild operation for the logical devices within the pool containing
the first failed physical drive. This rebuild operation is performed on the
<I>first</I> hot-spare drive of sufficient size to become a valid member of the
pool.
<P>Complete the folloing steps to start a hot-swap rebuild:
<OL type=1>
  <LI>Without removing the drive completely, gently remove the physical drive
  from the server, using the handle of the hot-swap tray. If necessary, refer to
  the documentation that comes with your server for information about removing a
  physical drive. <BR><BR><B><IMG height=15 src="images/attentio.gif"
  width=22>Attention:</B> When power is removed from a hot-swap drive, the drive
  immediately parks the heads, locks the actuator in the "landing zone," and
  begins spinning down. However, the spinning down of the disk might require up
  to 20 seconds after power is removed. Do not move the drive while it is
  spinning down. Moving the drive while it is spinning down might damage the
  drive. <BR><BR>
  <LI>Wait 20 seconds to allow the physical drive to completely stop spinning.
  <BR><BR>
  <LI>If you are certain there is nothing wrong with the physical drive you
  removed, gently reinstall the drive into the server. Make sure the drive is
  completely installed in the backplane connector.
  <P>Otherwise, replace the physical drive with a new drive that is the same
  size (or larger) and continue with the rebuild operation. <BR><BR>
  <DL>
    <DT><IMG height=17 src="images/note.gif" width=15> <STRONG>Notes:</STRONG>
    <DD>
    <OL>
      <LI>If multiple drives fail in separate pools (one physical drive per
      pool), replace each failed physical drive. If multiple physical drives
      fail at the same time within the <I>same</I> pool, contact your
      service representative. <BR><BR>
      <LI>Although it is possible to rebuild a failed physical drive to an
       optimal physical drive that is defective, avoid doing so.
  </LI></OL></DD></DL></LI></OL>
<H2>More information</H2>
<UL>
  <LI><A href="cfixddd.htm">Rebuilding a failed drive</A>
  <LI><A href="cfixddd1.htm">Recovering from failed drives</A>
  <LI><A href="arbddd.htm">Manually rebuilding a failed drive</A>


  <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>

<div align="center">
  <hr>
  <a href="gportal.htm">Glossary</a> | <a href="menutoc.htm">Contents</a></div>
<P>&nbsp;</P>
<P align=right>x-1079-HSM-00-08-EN </P></BODY></HTML>
