66 lines
4.0 KiB
HTML
66 lines
4.0 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
|
<meta name="DC.Type" content="concept" />
|
|
<meta name="DC.Title" content="Make application programs resilient" />
|
|
<meta name="abstract" content="Learn how to make application programs resilient." />
|
|
<meta name="description" content="Learn how to make application programs resilient." />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaigapplicationswritehighlyavailable.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rzaigapplicationsmakeappsresilient" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Make application programs resilient</title>
|
|
</head>
|
|
<body id="rzaigapplicationsmakeappsresilient"><a name="rzaigapplicationsmakeappsresilient"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Make application programs resilient</h1>
|
|
<div><p>Learn how to make application programs resilient.</p>
|
|
<p>A resilient application is expected to have the following characteristics:</p>
|
|
<ul><li>The application can be restarted on this node or another node</li>
|
|
<li>The application is accessible to the client through the IP address</li>
|
|
<li>The application is stateless or state information is known</li>
|
|
<li>Data that is associated with the application is available after switchover</li>
|
|
</ul>
|
|
<p><img src="./delta.gif" alt="Start of change" />The three essential elements that make an application resilient
|
|
to system outages in a clustered environment are:<img src="./deltaend.gif" alt="End of change" /></p>
|
|
<dl><dt class="dlterm">The application itself</dt>
|
|
<dd>How tolerant is the application to errors or to system outages, and how
|
|
transparently can the application restart itself? <p>The application can handle
|
|
this through the use of clustering capabilities.</p>
|
|
</dd>
|
|
<dt class="dlterm">Associated data</dt>
|
|
<dd>When an outage occurs, does it affect the availability of any associated
|
|
data? <p>A cluster middleware IBM Business Partner replication product which
|
|
takes advantage of the clustering capabilities can handle this. Alternatively,
|
|
the data can be stored in a switchable independent disk pool (switchable independent
|
|
ASP).</p>
|
|
</dd>
|
|
<dt class="dlterm">Control capabilities and administration</dt>
|
|
<dd>How easy is it to define the environment that supports the availability
|
|
of the data and the application? <p><img src="./delta.gif" alt="Start of change" />A third-party cluster management
|
|
solution that uses the clustering APIs and also combines resilient applications
|
|
with resilient data can handle this.<img src="./deltaend.gif" alt="End of change" /></p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaigapplicationswritehighlyavailable.htm" title="A highly available application is one that can be resilient to a system outage in a clustered environment.">Writing a highly available cluster application</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |