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<h1 class="topictitle1">Cluster limits</h1>
<div><p>This topic provides system limits for clusters which include cluster
software limits, OptiConnect limits, HSL OptiConnect loop limits, and SPD
OptiConnect limits.</p>
<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. Cluster software limits</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e23">Cluster software limits</th>
<th valign="top" width="50%" id="d0e25">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e23 "><img src="./delta.gif" alt="Start of change" />Maximum number of nodes in a cluster<img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="50%" headers="d0e25 "><img src="./delta.gif" alt="Start of change" />128<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of nodes in a recovery domain in a cluster resource
group</td>
<td valign="top" width="50%" headers="d0e25 ">128</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of clusters that a node may be a member of</td>
<td valign="top" width="50%" headers="d0e25 ">1</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of IP addresses per cluster node</td>
<td valign="top" width="50%" headers="d0e25 ">2</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of data port IP addresses per recovery
domain node</td>
<td valign="top" width="50%" headers="d0e25 ">4</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 "><img src="./delta.gif" alt="Start of change" />Maximum number of site names per device cluster resource
group<img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="50%" headers="d0e25 "><img src="./delta.gif" alt="Start of change" />2<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of configuration objects per cluster
resource group</td>
<td valign="top" width="50%" headers="d0e25 ">256</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of application restarts</td>
<td valign="top" width="50%" headers="d0e25 ">3</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of nodes which can be configured in a
cluster via the iSeries™ Navigator
Simple Cluster Management interface</td>
<td valign="top" width="50%" headers="d0e25 ">4</td>
</tr>
</tbody>
</table>
</div>
</div>
</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 2. OptiConnect (Option
23 of i5/OS™)
limits</caption><thead align="left"><tr><th valign="top" width="50.25125628140703%" id="d0e90">OptiConnect limits</th>
<th valign="top" width="49.74874371859296%" id="d0e92">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50.25125628140703%" headers="d0e90 ">Maximum number of systems that can be connected using OptiConnect</td>
<td valign="top" width="49.74874371859296%" headers="d0e92 ">64</td>
</tr>
<tr><td valign="top" width="50.25125628140703%" headers="d0e90 ">Maximum number of logical connection paths that can be established
between two systems using OptiConnect <sup>1</sup></td>
<td valign="top" width="49.74874371859296%" headers="d0e92 "><img src="./delta.gif" alt="Start of change" />16<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50.25125628140703%" headers="d0e90 "><img src="./delta.gif" alt="Start of change" />Maximum number of OptiConnect open connections between any
two systems using OptiConnect <sup>2</sup><img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="49.74874371859296%" headers="d0e92 ">16 382</td>
</tr>
<tr><td valign="top" width="50.25125628140703%" headers="d0e90 "><img src="./delta.gif" alt="Start of change" />Maximum total number of active jobs on a system that can
use OptiConnect <sup>2</sup><img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="49.74874371859296%" headers="d0e92 ">262 135</td>
</tr>
<tr><td valign="top" width="50.25125628140703%" headers="d0e90 ">Maximum number of TCP/IP subnets per system that can be configured
to use OptiConnect<sup>3</sup></td>
<td valign="top" width="49.74874371859296%" headers="d0e92 ">8</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e90 d0e92 "><strong>Notes<sup>®</sup>:</strong> <ol><li><img src="./delta.gif" alt="Start of change" />Only 2 of the 16 logical connection paths can be using SPD
Bus adapters (others must be HSL).<img src="./deltaend.gif" alt="End of change" /></li>
<li><img src="./delta.gif" alt="Start of change" />An OptiConnect open connection is an active communications
link between a job or task on one system and a job or task on another system.
Using the WRKOPCACT command, you can determine the number of current open
connections by adding the 'Users' count under the 'Client Statistics View'
to the 'Agents' count under the 'Server Statistics View'. With this command,
you can view the jobs and tasks associated with individual OptiConnect open
connections by selecting F14 (Jobs and Tasks). <img src="./deltaend.gif" alt="End of change" /></li>
<li>The following count as TCP/IP subnets: <ul><li>Each OptiConnect TCP/IP interface with no associated local interface (ADDTCPIFC
keyword LCLIFC(*NONE))</li>
<li>Each unique interface associated with an OptiConnect TCP/IP interface</li>
</ul>
</li>
</ol>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</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 3. HSL OptiConnect Loop
limits </caption><thead align="left"><tr><th valign="top" width="50%" id="d0e158">HSL OptiConnect Loop limits</th>
<th valign="top" width="50%" id="d0e160">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e158 ">Maximum number of HSL OptiConnect Loops on a system</td>
<td valign="top" width="50%" headers="d0e160 "><img src="./delta.gif" alt="Start of change" />See <a href="http://www.redbooks.ibm.com/redbooks/pdfs/ga195486.pdf" target="_blank">IBM<sup>®</sup> <br /><img src="eserver.gif" alt="eServer logo" /><br /> i5 and iSeries Handbook</a>. <sup>2</sup><img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50%" headers="d0e158 ">Maximum number of systems that can be connected on a single HSL OptiConnect
Loop <sup>1</sup></td>
<td valign="top" width="50%" headers="d0e160 ">3</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e158 ">Maximum number of I/O towers and IXA cards on a single
HSL OptiConnect Loop <sup>1</sup></td>
<td valign="top" width="50%" headers="d0e160 ">4</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e158 ">Maximum HSL cable length</td>
<td valign="top" width="50%" headers="d0e160 ">250 meters (optical), 15 meters (copper)</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e158 d0e160 "> <div class="note"><span class="notetitle">Note:</span> <ol><li>If more than two systems are on an HSL OptiConnect Loop, then no I/O towers
or IXA cards are allowed on the same loop.</li>
<li><img src="./delta.gif" alt="Start of change" />You can also review the <img src="./delta.gif" alt="Start of change" /><a href="http://www-1.ibm.com/servers/eserver/iseries/ha/systemdesign.html" target="_blank">High Availability and Clusters</a><img src="./deltaend.gif" alt="End of change" /> web site
for more information about designing a high availability solution.<img src="./deltaend.gif" alt="End of change" /></li>
</ol>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</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 4. SPD OptiConnect limits. Use this table to learn about SPD OptiConnect system limits.</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e227">SPD OptiConnect limits</th>
<th valign="top" width="50%" id="d0e229">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e227 ">Maximum number of systems per hub</td>
<td valign="top" width="50%" headers="d0e229 ">14</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e227 ">Maximum SPD cable length</td>
<td valign="top" width="50%" headers="d0e229 ">500 meters (1063 Mbps) or 2 kilometers (266 Mbps)</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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