76 lines
5.2 KiB
HTML
76 lines
5.2 KiB
HTML
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<meta name="DC.Title" content="Logical partition concept: Bus-level and IOP-level I/O partitions" />
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<meta name="abstract" content="Depending on your needs, there can be advantages to setting up one type of I/O partition instead of another." />
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<title>Logical partition concept: Bus-level and IOP-level I/O partitions</title>
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</head>
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<body id="rzaitbusiop"><a name="rzaitbusiop"><!-- --></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: Bus-level and IOP-level I/O partitions</h1>
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<div><p>Depending on your needs, there can be advantages to setting up
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one type of I/O partition instead of another.</p>
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<p>With bus level I/O partitions, the system partitions I/O resources by bus.
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On a server that is completely partitioned at the bus level, every secondary
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partition has its own removable media and workstation.</p>
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<p>Bus-level logical partitions allow for:</p>
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<ul><li>Better problem isolation and therefore higher availability.</li>
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<li>Better performance.</li>
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<li>Simplified hardware management.</li>
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</ul>
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<p>When you partition a server at the IOP level, one or more buses are shared
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and divided up between the I/O resources by the IOP. This type of logical
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partitions allows for:</p>
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<ul><li>Greater flexibility when partitioning I/O subsystem.</li>
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<li>Potential cost reduction by eliminating some expansion units which the
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server requires to support additional buses.</li>
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<li>Optimization of hardware resources to avoid server limits.</li>
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<li>The ability to dynamically move the control of an IOP from one partition
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to another without the need to restart the system.</li>
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<li>Simplified configuration planning since you can dynamically move hardware
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from one partition to another.</li>
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</ul>
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<p>You might also consider having a system configuration with both bus-level
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partitioning and IOP-level partitioning. For example, you may put all of the
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IOPs that you wish to switch in a shared bus and configure all other logical
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partitions to have bus-level partitioning. The shared bus can then belong
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to a test partition. This allows you the ability to switch IOPs such as tape
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drives or LAN adapters to partitions that need these resources.</p>
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</div>
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<div>
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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="rzaitiodevice.htm" title="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.">Logical partition concept: IOP</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="rzaitswitching.htm" title="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.">Logical partition concept: IOP and device switching</a></div>
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</div>
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</div>
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</body>
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