<?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="Compressed objects and storage space" /> <meta name="abstract" content="All of the licensed programs and some objects of the operating system ship in a compressed form. This requires less storage space on your server. The server decompresses objects according to certain criteria, which could affect the performance of the server." /> <meta name="description" content="All of the licensed programs and some objects of the operating system ship in a compressed form. This requires less storage space on your server. The server decompresses objects according to certain criteria, which could affect the performance of the server." /> <meta name="DC.Relation" scheme="URI" content="rzahcconsiderswreplace.htm" /> <meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" /> <meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" /> <meta name="DC.Format" content="XHTML" /> <meta name="DC.Identifier" content="rzahcswscompres" /> <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>Compressed objects and storage space</title> </head> <body id="rzahcswscompres"><a name="rzahcswscompres"><!-- --></a> <!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script> <h1 class="topictitle1">Compressed objects and storage space</h1> <div><p>All of the licensed programs and some objects of the operating system ship in a compressed form. This requires less storage space on your server. The server decompresses objects according to certain criteria, which could affect the performance of the server.</p> <p>System jobs (QDCPOBJ<em>x</em>, where <samp class="codeph">x</samp> is a number) automatically decompress these objects during the installation process if your system has sufficient unused disk storage. If enough storage space is not available, the system decompresses the objects when you use them, which could affect the performance of the system.</p> <p>The server decompresses objects according to the following criteria:</p> <ul><li>Greater than 750 MB available storage <p>The system submits jobs to decompress all system objects just installed.</p> </li> <li>250-750 MB available storage <p>The server decompresses only frequently used objects automatically. Object-usage information (the number of days an object has been used and the last-used date) is used to identify frequently used objects. The server decompresses any object that was used at least five times when the last use was within the last 14 days. The server leaves the remaining low-use objects in compressed form.</p> <ul><li>This does not include decompression of objects that are shipped in the operating system and in library QSYS. The system resets usage information for those objects during the installation process. For all other licensed programs, the object usage information is kept during the installation process.</li> <li>A call to a system program does not update its usage information; the system does not automatically decompress programs in constrained storage mode. However, high-use programs ship in decompressed form and are not considered able to be compressed.</li> </ul> </li> <li>Less than 250 MB available storage <p>The system does not submit the decompression jobs and instead decompresses the objects as they are used.</p> </li> </ul> <div class="note"><span class="notetitle">Note:</span> The QDCPOBJ<em>x</em> system jobs might run for some time after the installation process completes. </div> </div> <div> <div class="familylinks"> <div class="parentlink"><strong>Parent topic:</strong> <a href="rzahcconsiderswreplace.htm" title="Use this information to understand special considerations of the server and its software when you upgrade or replace a release.">Software upgrade or replacement</a></div> </div> </div> </body> </html>