93 lines
6.6 KiB
HTML
93 lines
6.6 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Logical partition concept: bus" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Logical partition concept: bus</title>
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</head>
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<body id="rzaitbus"><a name="rzaitbus"><!-- --></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</h1>
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<div><p>A bus is a conductor that is used for transmitting signals or power.</p>
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<p>A system I/O bus conducts instructions from memory to the devices that
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are attached to the input/output processors (IOPs). A system I/O bus also
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conducts instructions from the IOPs back to memory.</p>
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<p>The main system unit contains one system I/O bus. The primary partition
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always uses bus 1. Secondary partitions can share this bus. Most expansion
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units contain at least one bus as well.</p>
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<p>Every logical partition needs a bus which the logical partition can either
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own dedicated or shared with other logical partitions. Each logical partition
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can use (without owning) a system I/O bus. You can dynamically change which
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logical partition owns the bus or the type of bus ownership (shared or dedicated)
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provided the owning partition owns the bus shared.</p>
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<p>It is possible to divide up your resources by system I/O bus when you create
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your logical partitions. This is called bus-level I/O partitioning. In this
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situation, you assign all resources (IOPs, IOAs, and devices) that are attached
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to the bus to only one logical partition.</p>
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<p>It is also possible to share a bus and divide up the resources on the bus
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according to IOPs. This is called IOP-level I/O partitioning. In this situation,
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you assign all resources (IOAs and devices) that are attached to a single
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IOP to only one logical partition at a time. You may assign other IOPs attached
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to this same bus to any other (or to the same) logical partition.</p>
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<p>When you add a bus to a logical partition, you must select whether to share
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the bus with other logical partitions. You have the following options for
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bus ownership type:</p>
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<ul><li>Own dedicated: you assign all IOPs, resources, and empty card positions
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to the partition (bus-level I/O partitioning).</li>
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<li>Own bus shared: Some IOPs along with their empty card positions can be
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assigned go with the bus owner (IOP-level I/O partitioning).</li>
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<li>Use bus shared: Another logical partition lists the bus as own bus shared,
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but this logical partition also uses the bus. In this situation, the owning
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logical partition may experience slightly improved performance. Consider having
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the partition using high data transfer rate resources to own the bus.</li>
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</ul>
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<p>You must assign the <var class="varname">own dedicated</var> type to any bus that
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contains the OptiConnect hardware.</p>
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<p>From the Configure Logical partition window, you can view all of the buses
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on the system. You may perform concurrent maintenance from the owning logical
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partition (dedicated buses only) or from the primary partition. However, you
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must perform concurrent maintenance for shared buses from the primary partition.</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="rzaitmainstore.htm" title="Processors use memory to temporarily hold information.">Logical partition concept: memory</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="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="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="rzaitopticonnect.htm" title="Learn how logical partitions are able to share data between partitions or between servers.">Communication options for logical partitions</a></div>
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</div>
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</div>
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</body>
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</html>
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