78 lines
4.9 KiB
HTML
78 lines
4.9 KiB
HTML
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<meta name="DC.Title" content="Choose dedicated or switchable IOP and devices for logical partitions" />
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<meta name="abstract" content="Use this information to determine if dedicated or switchable IOP are right for your partitioned environment." />
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<title>Choose dedicated or switchable IOP and devices for logical partitions</title>
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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">Choose dedicated or switchable IOP and devices for logical partitions</h1>
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<div><p>Use this information to determine if dedicated or switchable IOP
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are right for your partitioned environment.</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 utilization 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>The IBM<sup>®</sup> recommended
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approach is to confine all hardware within a partition. This is not always
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a cost-effective solution. With some devices it may be preferable to share
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them among partitions. Although partitions do not support concurrent device
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sharing, IOP-level switching may be an effective solution.</p>
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<ul><li><strong>Advantages of switching IOPs and devices</strong><ul><li>Reduced cost.</li>
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<li>Fewer card positions needed. In some cases, this could mean that you need
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fewer expansion units.</li>
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</ul>
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</li>
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<li> <strong>Disadvantages of switching IOPs and devices</strong><ul><li>Inconvenience of having to schedule use of switchable IOPs and devices.</li>
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</ul>
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</li>
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</ul>
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<div class="attention"><span class="attentiontitle">Attention:</span> For external tape (for instance, 3590), it is possible
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to have one tape device, but separate IOPs for each partition that will use
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it. A partition requesting use of the device receives a "busy" indication
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if it is in use by another partition.</div>
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<p>Before implementing a switchable IOP and other devices, you should also
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consider other possible alternatives. To share devices among partitions, you
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can apply the same techniques that are used to share devices among separate
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physical servers:</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 use 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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</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="rzaitunderstandhardware.htm" title="Determine if your hardware resources meet the minimum requirements needed to partition your server. Evaluate each iSeries model to determine how your hardware will function once you partition your server.">Hardware requirements 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="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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