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<title>Overview of *TYPE1 to *TYPE2 conversion</title>
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<h1 class="topictitle1">Overview of *TYPE1 to *TYPE2 conversion</h1>
<div><p><span>The "root" (/), QOpenSys, and user-defined
file systems (UDFS) in the integrated file system support the *TYPE2 directory
format as of OS/400<sup>®</sup> V5R1.</span></p>
<p>The *TYPE2 directory format is an enhancement of the original *TYPE1 directory
format. *TYPE2 directories have a different internal structure from *TYPE1
directories and provide improved performance and reliability. In addition
to improved performance and reliability, new functions such as integrated
file system scanning support are only available for objects in *TYPE2 directories.
See <a href="rzaaxscan.htm#rzaaxscan">Scanning support</a> for more information.</p>
<p>Shortly after <span class="keyword">i5/OS™</span> V5R3M0
operating system or a later release is installed, the conversion to *TYPE2
directories will automatically begin for any of the file systems which have
not yet been converted to support *TYPE2 directories. This conversion should
not significantly impact your system activity as it will run in a low priority
background job. </p>
<p>If the conversion function has not yet completed, and the system has a
normal or abnormal IPL, the conversion function will resume when the IPL is
completed. The conversion will restart on every IPL until all eligible file
systems have been fully converted.</p>
<p>The file systems that are eligible for this automatic conversion are "root"
(/), QOpenSys and the user-defined file systems for ASPs 1 through 32. </p>
<div class="note"><span class="notetitle">Note:</span> You can avoid the automatic conversion to *TYPE2
directories if you convert the file systems before installing V5R3M0 operating
system or a later release. </div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaaxconchapter.htm" title="The &#34;root&#34; (/), QOpenSys, and user-defined file systems (UDFS) in the integrated file system support the *TYPE2 directory format as of OS/400 V5R1.">Convert directories from *TYPE1 to *TYPE2</a></div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="rzaaxtype2.htm" title="The &#34;root&#34; (/), QOpenSys, and user-defined file systems (UDFS) in the integrated file system support the *TYPE2 directory format. The *TYPE2 directory format is an enhancement of the original *TYPE1 directory format.">*TYPE2 directories</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="rzaaxcvtcheck.htm" title="Shortly after i5/OS V5R3M0 operating system or a later release is installed, the conversion to *TYPE2 directories will automatically begin for any of the file systems which have not yet been converted to support *TYPE2 directories. This conversion processing will take place in a secondary thread of the QFILESYS1 system job.">Determine conversion status</a></div>
<div><a href="rzaaxiasp.htm" title="If the user-defined file systems in an independent ASP have not yet been converted to the *TYPE2 directory format, they will be converted the first time the independent ASP is varied on to a system installed with V5R2 or later of the operating system.">Tips: Independent ASP</a></div>
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