111 lines
8.4 KiB
HTML
111 lines
8.4 KiB
HTML
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<meta name="abstract" content="The IOP attaches to the system I/O bus and one or more input/output adapters (IOAs). The IOP processes instructions from the server and works with the IOAs to control the I/O devices." />
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<title>Logical partition concept: IOP</title>
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</head>
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<body id="rzaitiodevice"><a name="rzaitiodevice"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Logical partition concept: IOP</h1>
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<div><p>The IOP attaches to the system I/O bus and one or more input/output
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adapters (IOAs). The IOP processes instructions from the server and works
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with the IOAs to control the I/O devices.</p>
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<p>There are many different kinds of IOPs.</p>
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<ul><li>Some IOPs can only support one type of I/O device. In this case the IOA
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is embedded in the IOP so you can not remove the IOA or change it.</li>
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<li>Some IOPs can support multiple device types, but only one at a time. The
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type of IOA that is attached determines what device you can use. IOAs on these
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IOPs can be changed with another IOA to support a different I/O device. The
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IOA and the IOP work together to control the device.</li>
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<li>Some IOPs can support multiple types of I/O devices at the same time.
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These are known as Multifunction IOPs (MFIOP) or Combined function IOPs (CFIOP).
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Multifunction IOPs connect to a variety of different IOAs. For instance, an
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MFIOP could support disk units, workstations, a communications line, and removable
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media devices.</li>
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<li>A Combined function IOP can connect to a variety of different IOAs. For
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instance, a CFIOP could support disk units, a console, and communications
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hardware. The CFIOP contains some of the same capabilities as an MFIOP, as
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well as Ethernet and token-ring controllers. IOAs for the supported types
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of I/O devices attach to the IOP.</li>
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</ul>
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<p>There are several important I/O devices in the server. These include the
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load source disk unit, the alternate IPL device, the system console, and the
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electronic customer support hardware. The server needs to know where to locate
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these special devices on secondary partitions. When you create a logical partition,
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you need to identify the IOPs that control these important devices:</p>
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<ul><li>The IOP that controls the disk unit that will be the load source.</li>
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<li>The IOP that controls the console.</li>
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<li>The IOP that controls the alternate IPL device.</li>
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<li>The IOP that controls the electronic customer support line.</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> A system with logical partitions needs to have the correct IOP feature
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codes for the load source disk unit and alternate IPL devices. Without the
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correct hardware, the secondary partitions will not function correctly.</div>
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<p>The system reports all errors that involve IOPs to the product activity
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log (PAL) in the logical partition that owns the IOP. However, the system
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may report errors in the PAL of the primary partition against load source
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IOPs. This may occur when a secondary partition restarts.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzaitswitching.htm">Logical partition concept: IOP and device switching</a></strong><br />
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If you elect to partition at the IOP-level, you can switch certain IOPs and all its attached devices between partitions that share the same bus dynamically.</li>
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<li class="ulchildlink"><strong><a href="rzaittagged.htm">Logical partition concept: tagged resource</a></strong><br />
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A tagged resource is an IOP that you select because it controls a device that performs a specific function for a logical partition.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaithardwarereq.htm" title="Understand the basic hardware concepts and requirements to partition your server.">Hardware for logical partitions</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaitbus.htm" title="A bus is a conductor that is used for transmitting signals or power.">Logical partition concept: bus</a></div>
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<div><a href="rzaitbusiop.htm" title="Depending on your needs, there can be advantages to setting up one type of I/O partition instead of another.">Logical partition concept: Bus-level and IOP-level I/O partitions</a></div>
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<div><a href="rzaitdynamic.htm" title="A powerful advantage of logical partitions is ability to dynamically switch an IOP from one partition to another.">Dynamically switching IOPs between partitions</a></div>
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<div><a href="rzaitexpansion.htm" title="You can add an expansion unit to many of the iSeries servers to support additional features and devices.">Logical partition concept: expansion unit</a></div>
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<div><a href="rzaitdiskunit.htm" title="Disk units store data. The server can use and reuse this data at any time. It is more permanent than memory, but you can still erase it.">Logical partition concept: disk units</a></div>
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<div><a href="rzaitremovable.htm" title="A removable media device reads and writes to media (tape, CD-ROM, or DVD).">Logical partition concept: alternate restart (IPL) devices and removable media device</a></div>
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<div><a href="rzaitconceptconsole.htm" title="Each logical partition must have a console attached to it through an IOP.">Logical partition concept: console</a></div>
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<div><a href="rzaitloadsource.htm" title="Each logical partition must have one disk unit designated as the load source.">Logical partition concept: load source</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaitpal.htm" title="Use Dedicated Service Tools (DST) or System Service Tools (SST) to find system reference codes for logical partitions.">View the Product Activity Log (PAL) for logical partitions</a></div>
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</div>
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</div>
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</body>
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