59 lines
3.7 KiB
HTML
59 lines
3.7 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 xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||
|
|
<meta name="dc.language" scheme="rfc1766" 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. -->
|
||
|
|
<meta name="dc.date" scheme="iso8601" content="2005-10-17" />
|
||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
|
||
|
|
<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))' />
|
||
|
|
<title>Application structure</title>
|
||
|
|
<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
|
||
|
|
<link rel="stylesheet" type="text/css" href="ic.css" />
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
|
||
|
|
<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
|
||
|
|
|
||
|
|
|
||
|
|
<a name="struct"></a>
|
||
|
|
<h3 id="struct">Application structure</h3>
|
||
|
|
<p>An OptiConnect cluster will usually have a database system and one or more
|
||
|
|
application systems. The system where the database resides is the <span class="bold">database </span> system, and the systems that contain the applications are called <span class="bold">application</span> systems. The OptiConnect software allows a
|
||
|
|
program on the application system to make database changes or database queries
|
||
|
|
on the database system. Central Processing Unit (CPU) work load ratios of
|
||
|
|
under 30% database and 70% application will benefit the most by distributing
|
||
|
|
work loads between systems in the OptiConnect network. <a href="rzau3struct.htm#app">Figure 6</a> illustrates
|
||
|
|
an example of this type of setup.</p>
|
||
|
|
<a name="app"></a>
|
||
|
|
<div class="fignone" id="app"><span class="figcap">Figure 6. CPU Utilization by OptiConnect</span>
|
||
|
|
<div class="mmobj">
|
||
|
|
<img src="rv4f201.gif" alt="CPU Utilization by OptiConnect" /></div></div>
|
||
|
|
<p>Another important consideration is whether the application is batch or
|
||
|
|
interactive. This clustering technology is optimal for interactive workloads.
|
||
|
|
Batch workloads require special considerations and may not be appropriate
|
||
|
|
for use in an OptiConnect environment. However, solutions can be designed
|
||
|
|
to effectively handle a mixture of batch and interactive workloads, as well
|
||
|
|
as multiple database and application methods. Applications with heavy database
|
||
|
|
activity and large numbers of file open and close operations may not realize
|
||
|
|
the full potential of the OptiConnect technology.</p>
|
||
|
|
<p>When a program opens a database file, the associated DDM file or RDB entry
|
||
|
|
identifies the database system name. The OptiConnect Connection Manager on
|
||
|
|
the application system sends the database request to the database system by
|
||
|
|
using a fast <span class="italic">device driver</span>. The OptiConnect communication
|
||
|
|
link provides access at a fraction of the DDM system overhead because its
|
||
|
|
communications protocol operates only in a specific shared bus environment.
|
||
|
|
The OptiConnect Connection Manager connects the request with an agent job
|
||
|
|
on the database system. Agent jobs work with the database code to issue the
|
||
|
|
request and route the result back to the application system.</p>
|
||
|
|
<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
|
||
|
|
</body>
|
||
|
|
</html>
|