93 lines
6.6 KiB
HTML
93 lines
6.6 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
|
<meta name="DC.Type" content="concept" />
|
|
<meta name="DC.Title" content="Logical partition concept: bus" />
|
|
<meta name="abstract" content="A bus is a conductor that is used for transmitting signals or power." />
|
|
<meta name="description" content="A bus is a conductor that is used for transmitting signals or power." />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaithardwarereq.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitmainstore.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitiodevice.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitexpansion.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitbusiop.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitdynamic.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitiodevice.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitexpansion.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzaitopticonnect.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rzaitbus" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Logical partition concept: bus</title>
|
|
</head>
|
|
<body id="rzaitbus"><a name="rzaitbus"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Logical partition concept: bus</h1>
|
|
<div><p>A bus is a conductor that is used for transmitting signals or power.</p>
|
|
<p>A system I/O bus conducts instructions from memory to the devices that
|
|
are attached to the input/output processors (IOPs). A system I/O bus also
|
|
conducts instructions from the IOPs back to memory.</p>
|
|
<p>The main system unit contains one system I/O bus. The primary partition
|
|
always uses bus 1. Secondary partitions can share this bus. Most expansion
|
|
units contain at least one bus as well.</p>
|
|
<p>Every logical partition needs a bus which the logical partition can either
|
|
own dedicated or shared with other logical partitions. Each logical partition
|
|
can use (without owning) a system I/O bus. You can dynamically change which
|
|
logical partition owns the bus or the type of bus ownership (shared or dedicated)
|
|
provided the owning partition owns the bus shared.</p>
|
|
<p>It is possible to divide up your resources by system I/O bus when you create
|
|
your logical partitions. This is called bus-level I/O partitioning. In this
|
|
situation, you assign all resources (IOPs, IOAs, and devices) that are attached
|
|
to the bus to only one logical partition.</p>
|
|
<p>It is also possible to share a bus and divide up the resources on the bus
|
|
according to IOPs. This is called IOP-level I/O partitioning. In this situation,
|
|
you assign all resources (IOAs and devices) that are attached to a single
|
|
IOP to only one logical partition at a time. You may assign other IOPs attached
|
|
to this same bus to any other (or to the same) logical partition.</p>
|
|
<p>When you add a bus to a logical partition, you must select whether to share
|
|
the bus with other logical partitions. You have the following options for
|
|
bus ownership type:</p>
|
|
<ul><li>Own dedicated: you assign all IOPs, resources, and empty card positions
|
|
to the partition (bus-level I/O partitioning).</li>
|
|
<li>Own bus shared: Some IOPs along with their empty card positions can be
|
|
assigned go with the bus owner (IOP-level I/O partitioning).</li>
|
|
<li>Use bus shared: Another logical partition lists the bus as own bus shared,
|
|
but this logical partition also uses the bus. In this situation, the owning
|
|
logical partition may experience slightly improved performance. Consider having
|
|
the partition using high data transfer rate resources to own the bus.</li>
|
|
</ul>
|
|
<p>You must assign the <var class="varname">own dedicated</var> type to any bus that
|
|
contains the OptiConnect hardware.</p>
|
|
<p>From the Configure Logical partition window, you can view all of the buses
|
|
on the system. You may perform concurrent maintenance from the owning logical
|
|
partition (dedicated buses only) or from the primary partition. However, you
|
|
must perform concurrent maintenance for shared buses from the primary partition.</p>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<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>
|
|
</div>
|
|
<div class="relconcepts"><strong>Related concepts</strong><br />
|
|
<div><a href="rzaitmainstore.htm" title="Processors use memory to temporarily hold information.">Logical partition concept: memory</a></div>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |