77 lines
5.0 KiB
HTML
77 lines
5.0 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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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Determine the amount of memory to move" />
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<meta name="abstract" content="Primary partitions need a minimum of 256 MB of memory." />
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<meta name="description" content="Primary partitions need a minimum of 256 MB of memory." />
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<meta name="DC.Relation" scheme="URI" content="rzaitmoveresources.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaitmovememory.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaitmoveresources.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzaitmemorymove" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>Determine the amount of memory to move</title>
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</head>
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<body id="rzaitmemorymove"><a name="rzaitmemorymove"><!-- --></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">Determine the amount of memory to move</h1>
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<div><p>Primary partitions need a minimum of 256 MB of memory. </p>
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<p>The minimum memory of V5R1 and V5R2 secondary partitions is 128 MB. V4R4
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and V4R5 secondary partitions minimum memory requirement remains 64 MB. Depending
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on the number of secondary partitions on the server, the primary partition
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may need more memory to successfully manage the partitions on the server.</p>
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<p>To dynamically move memory, you have to establish a minimum and maximum
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range within which you can move the resource without needing to restart the
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logical partition. Changing the maximum value requires a system restart. Changing
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the minimum value only requires you to restart the partition. Due to performance
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reasons, you are recommended to specify the maximum value that is close to
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the amount of memory the partition will use on a regular basis. By specifying
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a maximum value higher than what is needed for the partition, you waste valuable
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memory resources. Minimum values dictate what is required to restart the partition.
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If the minimum value is not met for all logical partitions, only the primary
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will restart. You can specify a memory minimum value as low as 0. A value
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of 0 in any partition creates a non-functioning partition. If the primary
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partition has been restarted (a system restart) after the secondary partition
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was set to 0, then another system restart is required when the secondary memory
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value is changed. If the changes are made to the memory within the same primary
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restart, then a system restart is not required to make changes to the memory
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allocations.</p>
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<p>The full amount of memory that you assign to a logical partition may not
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be available for the partition's use. Static memory overhead required to support
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the assigned maximum memory will affect the reserved or hidden memory amount.
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This static memory overhead will also influence the minimum memory size of
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a partition.</p>
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<p>When you dynamically remove memory from a logical partition, the currently
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allocated amount may not be reduced to the new value you have specified until
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you restart the partition. This is dependent upon factors in the running operating
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system in that partition. Runtime values are based on memory the partition
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needs to complete an assigned task.</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="rzaitmoveresources.htm" title="You can dynamically move processors, memory, and interactive performance.">Perform dynamic movement of resources</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="rzaitmoveresources.htm" title="You can dynamically move processors, memory, and interactive performance.">Perform dynamic movement of resources</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaitmovememory.htm" title="Memory in each logical partition operates within its assigned minimum and maximum values.">Dynamically move memory</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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