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<h1 class="topictitle1">File system limits</h1>
<div><p>This topic contains the values for the system limits that are related
to file systems. </p>
<div class="section"><p>They include limits on the number of documents in
a folder, the size of a document, and the size of a stream file, among others.</p>
</div>
<div class="section"><div class="p">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 1. File system limits</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e26">File system limits</th>
<th valign="top" width="50%" id="d0e28">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of libraries in the system part of the library list</td>
<td valign="top" width="50%" headers="d0e28 ">15</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of libraries in the user part of the library list<sup>1</sup></td>
<td valign="top" width="50%" headers="d0e28 ">250</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of objects in a library</td>
<td valign="top" width="50%" headers="d0e28 ">Approximately 360 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of documents and folders (DLOs) in a user ASP</td>
<td valign="top" width="50%" headers="d0e28 ">349 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of DLOs in a folder</td>
<td valign="top" width="50%" headers="d0e28 ">65 510</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum size of a document</td>
<td valign="top" width="50%" headers="d0e28 ">2 gigabytes - 1</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum cumulative number of objects across the "root"
(/), QOpenSys, and user-defined file systems of ASPs 1 through 32</td>
<td valign="top" width="50%" headers="d0e28 ">2 147 483 647</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum cumulative number of objects across the user-defined
file systems for each Independent ASP</td>
<td valign="top" width="50%" headers="d0e28 ">2 147 483 647</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 "><img src="./delta.gif" alt="Start of change" />Maximum cumulative number of user-defined file systems
in ASPs 1 through 32 <img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="50%" headers="d0e28 "><img src="./delta.gif" alt="Start of change" />2 147 483 647<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of user-defined files systems in an Independent
ASP</td>
<td valign="top" width="50%" headers="d0e28 ">Approximately 4000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of directories in one *TYPE1 directory
in the "root" (/), QOpenSys, or user-defined file systems</td>
<td valign="top" width="50%" headers="d0e28 ">32 765</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of directories in one *TYPE2 directory
in the "root" (/), QOpenSys, or user-defined file systems</td>
<td valign="top" width="50%" headers="d0e28 ">999 998</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of *TYPE1 directory links for an object
in the "root" (/), QOpenSys, or user-defined file systems</td>
<td valign="top" width="50%" headers="d0e28 ">32 767</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of *TYPE2 directory links for an object
in the "root" (/), QOpenSys, or user-defined file systems</td>
<td valign="top" width="50%" headers="d0e28 ">1 000 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum size of a stream file</td>
<td valign="top" width="50%" headers="d0e28 ">1 terabyte</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 "><img src="./delta.gif" alt="Start of change" />Maximum file size that can be read or written using
the iSeries™ Access
File Server<img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="50%" headers="d0e28 "><img src="./delta.gif" alt="Start of change" />4 gigabytes<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Default maximum number of file and socket descriptors
per job<sup>2</sup></td>
<td valign="top" width="50%" headers="d0e28 ">200</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of file and socket descriptors per job</td>
<td valign="top" width="50%" headers="d0e28 ">2 500 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximums for directory levels, path names, and object
attributes and links</td>
<td valign="top" width="50%" headers="d0e28 ">See the <a href="../ifs/rzaaxfscmp.htm">File System Comparison</a> topic in the Information Center.</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of files that the iSeries Access File Server can have open
at one time<sup>3</sup></td>
<td valign="top" width="50%" headers="d0e28 ">16 776 960</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e26 ">Maximum number of scan descriptors per job<sup>4</sup></td>
<td valign="top" width="50%" headers="d0e28 ">Approximately 524 000</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e26 d0e28 "><strong>Notes:</strong> <ol><li>There are compatibility considerations for application programs that retrieve
library lists and are not prepared for the longer lists. For more details,
see the V5R1 Memo to Users.</li>
<li>Default can be changed with <a href="../apis/dossrmfh.htm">DosSetRelMaxFH()</a> - Change the Maximum Number of File
Descriptors (see <a href="../apis/unix.htm">UNIX-Type
APIs</a> in the Information Center.)</li>
<li> This limit is cumulative across all File Server jobs (QPWFSxxxx and QZLSFILE
jobs) on the system. Once a file is closed, it no longer counts toward the
limit. Some applications that can be affected by this limit are iSeries Access, iSeries NetServer™, Network
Station<sup>®</sup> boot up (which keeps over 200 files open, unless using Compact
Flash Memory which only requires about 25 files) and applications, and the
QFileSvr.400 file system.</li>
<li><img src="./delta.gif" alt="Start of change" />For more information about scan descriptors, see <a href="../apis/xopendbf.htm">Integrated File System Scan on Open
Exit Program</a> in the API topic. <img src="./deltaend.gif" alt="End of change" /></li>
</ol>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzampoverview.htm" title="If you exceed system limitations you can experience an application outage or a system outage. Avoid these types of outages by being aware of the maximum capacities and system limitations in advance.">Maximum capacities</a></div>
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