100 lines
6.9 KiB
HTML
100 lines
6.9 KiB
HTML
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<meta name="DC.Title" content="Dynamically switching IOPs between partitions" />
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<meta name="abstract" content="A powerful advantage of logical partitions is ability to dynamically switch an IOP from one partition to another." />
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<title>Dynamically switching IOPs between partitions</title>
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<body id="rzaitdynamic"><a name="rzaitdynamic"><!-- --></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">Dynamically switching IOPs between partitions</h1>
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<div><p>A powerful advantage of logical partitions is ability to dynamically
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switch an IOP from one partition to another. </p>
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<p>When you dynamically switch an IOP, you take the control of an IOP away
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from one partition and give it to another without restarting the server.</p>
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<p>On a shared bus, IOPs and their resources (all IOAs and attached devices)
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can be dynamically moved between partitions. To initiate this action, right
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click on the desired IOP and select <span class="uicontrol">Move</span>.</p>
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<p>When you dynamically switch an IOP between partitions, you make it appear
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as though partitions can share devices. For example, if your server has a
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low use device, more than one partition can use that device by switching IOPs.
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Each partition can use the device because switching an IOP switches all devices
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attached to it. However, partitions can only use that device one at a time.
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You can only switch the IOP to one partition at time. Before you perform this
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task, you need to free that device in <span class="keyword">i5/OS™</span> on
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the source partition. You can do this by using the iSeries™ Navigator.</p>
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<p>IOPs that are candidates for switching include:</p>
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<ul><li>IOPs that control high cost devices.</li>
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<li>IOPs that control low use devices and low demand devices.</li>
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<li>IOPs that solely control the target device or devices.</li>
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</ul>
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<p>Before you use IOP switching, you should remember the IBM<sup>®</sup> recommended
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approach to logical partitioning is to dedicate all hardware within a partition.
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You should partition your server at the bus level. However, when you use bus
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level partitioning you cannot switch IOPs. Also, bus level partitioning is
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not always cost-effective. Therefore, you may find it preferable to share
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some devices among partitions. And while partitions cannot concurrently share
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devices, IOP switching may be an effective solution to the cost problem.</p>
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<p>Before you implement switching, you should consider other possible alternatives.
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To share devices among partitions, you can apply the same techniques that
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are used to share devices among separate physical systems:</p>
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<ul><li>Use multiple IOPs, one in each partition, for devices that support multiple
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connections (some high end tape drives).</li>
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<li>Use multiple IOPs, one in each partition, and a switch box for devices
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that only support single connections (printers, or some high end tape drives).</li>
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<li>Use multiple IOPs and multiple devices in each partition for a self-contained
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solution (internal removable media devices).</li>
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<li>If it is not feasible for you to use any of these alternatives, then you
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should implement IOP switching.</li>
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</ul>
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<p>You can implement dynamic IOP switching by making sure that the primary
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partition owns each bus with a bus ownership type of <var class="varname">own bus shared</var>.
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All secondary partitions can then simply use any bus they need. With this
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configuration you can assign every IOP in the server to the partition that
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wants to use it. All partitions can dynamically add and remove any IOPs that
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control high cost, and low use devices that are attached to the system.</p>
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<p>In addition to enabling IOP switching, this configuration has several other
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advantages.</p>
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<ul><li>Conceptually, the implementation is easy to configure and understand.</li>
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<li>The primary partition will own any new hardware that is added to the system.</li>
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<li>As partition needs change over time, you can make adjustments with optimal
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hardware use and greater flexibility.</li>
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</ul>
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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="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="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="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="rzaitchoosebusiop.htm" title="Depending on your needs, there can be advantages to partitioning your I/O resources in different ways.">Select bus-level or IOP-level partitioning</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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