<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<!-- saved from url=(0014)about:internet -->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="Content-Style-Type" content="text/css" />
    <meta name="GENERATOR" content="Quadralay WebWorks AutoMap 2003 Platinum Edition Client for FrameMaker 8.6.6597.0" />
    <meta name="TEMPLATEBASE" content="emwebh8-1-17" />
    <meta name="LASTUPDATED" content="08/01/13 14:48:37" />
    <title>FlexAttach Virtual pWWN </title>
    <!-- Copyright 2010-2013, Cisco Systems, Inc. All rights reserved. -->

    <link rel="StyleSheet" href="document.css" type="text/css" />
    <link rel="StyleSheet" href="catalog.css" type="text/css" />


<script> 
    var is_chrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1; 
   
    if(is_chrome){document.domain=document.domain}
   </script>
    <script type="text/javascript" language="JavaScript1.2" src="expand.js"></script>
    <script type="text/javascript" language="JavaScript1.2" src="page.js"></script>

    <script type="text/javascript" language="JavaScript1.2">
     <!--
      function  WWNoOp() {}
      function  WWNoValue() { return ""; }

      var  VarDropDown;

      if (typeof(HTMLHelp_Object) != "undefined")
      {
        VarDropDown = new WWDropDown_Object();
      }
      else
      {
        VarDropDown = new Object();
        VarDropDown.fAnchorOpen  = WWNoOp;
        VarDropDown.fAnchorClose = WWNoOp;
        VarDropDown.fDIVOpen  = WWNoOp;
        VarDropDown.fDIVClose = WWNoOp;
      }
     // -->
    </script>

  
<SCRIPT language="javascript">
<!--
  self.document.write("<link href='"+top.relPath+"shared/style.css' rel='stylesheet' type='text/css'>");
  myid=2528;
  self.document.write("<script type='text/javascript' language='JavaScript' src='"+top.relPath+"shared/con_utils.js'></scr"+"ipt>");
//-->
</SCRIPT>
</head>

  <body onload="highlightSearchTerms();" bgcolor="#ffffff">

    
    <blockquote>
    <a name="top"></a>

    
    


<a name="wp1072449"> </a><h1 class="pTitle">
FlexAttach Virtual pWWN

</h1>
<a name="wp1072450"> </a><p class="pBody">
FlexAttach virtual pWWN feature facilitates server and configuration management. In a SAN 
environment, the server installation or replacement, requires interaction and coordination among the 
SAN and server administrators. For coordination, it is important that the SAN configuration does not 
change when a new server is installed, or when an existing server is replaced. FlexAttach virtual pWWN 
minimizes the interaction between the server administrator and the SAN administrator by abstracting the 
real pWWN using virtual pWWNs.

</p>
<a name="wp1072451"> </a><p class="pBody">
When FlexAttach virtual pWWN is enabled on an interface, a virtual pWWN is assigned to the server 
interface. The real pWWN is replaced by a virtual pWWN, which is used for a SAN configuration such 
as zoning.

</p>
<a name="wp1072452"> </a><p class="pBody">
Server administrators can benefit from FlexAttach in the following scenarios: 

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1072453"> </a><li class="pSmartList1">Pre-configure&#8212;Pre-configure SAN for new servers that are not available physically yet. For 
example, they may be on order. FlexAttach can be enabled on the ports designated for the new 
servers and use the virtual WWNs assigned for configuring SAN. The new servers are then plugged 
into the fabric without any change needed in the SAN. 
</li>
<a name="wp1072454"> </a><li class="pSmartList1">Replacement to the same port&#8212;A failed server can be replaced onto the same port without changing 
the SAN. The new server gets a same pWWN as the failed server because the virtual pWWN is 
assigned to the port.
</li>
<a name="wp1072455"> </a><li class="pSmartList1">Replacement to (spare)&#8212;A spare server, which is on the same NPV device or a different NPV 
device) can be brought online without changes to the SAN. This action is achieved by moving the 
virtual port WWN from the current server port to the spare port. 
</li>
<a name="wp1072456"> </a><li class="pSmartList1">Server Mobility&#8212;A server can be moved to another port on the same NPV device or another NPV 
device without changing the SAN. This is accomplished by moving the virtual pWWN to the new 
port. No change is needed if FlexAttach was configured using the physical port WWN of the server 
to the virtual port WWN mapping. 
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

    </blockquote>

  </body>
</html>
