108 lines
7.3 KiB
HTML
108 lines
7.3 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="task" />
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<meta name="DC.Title" content="Change memory pool size" />
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<meta name="abstract" content="The size of a memory pool directly affects the amount of work that a subsystem can process. The more memory a subsystem has, the more work it can potentially complete. It is important that you monitor your system carefully before you start changing the parameters of your memory pools. You will also want to periodically recheck these levels, as some readjustment might need to be done." />
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<meta name="description" content="The size of a memory pool directly affects the amount of work that a subsystem can process. The more memory a subsystem has, the more work it can potentially complete. It is important that you monitor your system carefully before you start changing the parameters of your memory pools. You will also want to periodically recheck these levels, as some readjustment might need to be done." />
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<meta name="DC.Relation" scheme="URI" content="rzaksmanagemp1.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004-2006" />
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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>Change memory pool size</title>
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</head>
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<body id="xrzakschgmemplsz"><a name="xrzakschgmemplsz"><!-- --></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">Change memory pool size</h1>
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<div><p>The size of a memory pool directly affects the amount of work that
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a subsystem can process. The more memory a subsystem has, the more work it
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can potentially complete. It is important that you monitor your system carefully
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before you start changing the parameters of your memory pools. You will also
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want to periodically recheck these levels, as some readjustment might need
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to be done. </p>
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<div class="p">Make sure you turn off the system tuner before you start manually
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changing memory pool sizes. The system tuner automatically adjusts the sizes
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of your shared memory pools to the amount of work the system is doing. If
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the system tuner is not turned off, the changes you make manually might be
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changed automatically by the tuner. <p>Turn the system tuner off by changing
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the Automatically adjust memory pools and activity levels (QPFRADJ) system
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value to 0. (0 = No adjustment)</p>
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</div>
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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="rzaksmanagemp1.htm" title="Making sure that jobs get enough memory to complete efficiently is important. If too much memory is given to subsystem A and not enough to subsystem B, jobs in subsystem B might begin to run poorly. The following information describes the various tasks that are involved in managing memory pools.">Manage memory pools</a></div>
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</div>
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</div><div class="nested1" xml:lang="en-us" id="navchgmemplsz"><a name="navchgmemplsz"><!-- --></a><h2 class="topictitle2">iSeries Navigator</h2>
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<div><ol><li><span>In iSeries™ Navigator,
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expand <span class="menucascade"><span class="uicontrol">My Connections</span> > <span class="uicontrol">server</span> > <span class="uicontrol">Work Management</span> > <span class="uicontrol">Memory Pools</span> > <span class="uicontrol">Active Pools or Shared Pools</span></span>.</span></li>
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<li><span>Right-click the memory pool that you want to work in (for example,
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Interactive) and click <span class="uicontrol">Properties</span>. The <strong>Memory Pool
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Properties </strong>window appears.</span></li>
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<li><span>From the Configuration tab of the <strong>Properties</strong> window, you
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can change the defined amount of memory. Defined memory is the maximum amount
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of memory that the pool can use. The number you put here should reflect the
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amount of memory that you think the pool will need to support the subsystems
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it services. </span></li>
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</ol>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> The Base pool is the only memory pool that does
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not have a defined amount of memory. Instead it has a minimum amount of memory
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that it needs to run. The Base pool contains everything that is not allocated
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elsewhere. For example, you might have 1000 MB of memory on your system of
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which 250 MB is allocated to the Machine pool and 250 MB is allocated to the
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Interactive pool. 500 MB is not allocated to anything. This non-allocated
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memory is stored in the Base pool until it is needed. <p>Use caution when
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moving memory. Moving memory from one pool to another can fix one subsystem,
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but can cause problems for other subsystems, which in turn, can worsen system
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performance. </p>
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</div>
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</div>
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</div>
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</div>
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<div class="nested1" xml:lang="en-us" id="cbichgmemplsz"><a name="cbichgmemplsz"><!-- --></a><h2 class="topictitle2">Character-based interface</h2>
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<div><div class="p"><span><strong>Command</strong>: Change System Value (<span class="cmdname">CHGSYSVAL </span>)</span></div>
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<div class="example"><strong>Example</strong>: The following changes the size of the Machine pool. <blockquote><pre>CHGSYSVAL QMCHPOOL 'new-size-in-KB'</pre>
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This
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corresponds to pool 1 on the WRKSYSTS display. </blockquote>
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<p> </p>
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<p><strong>Example</strong>:
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The following changes the minimum size of the base pool. </p>
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<div class="p"><blockquote><pre>CHGSYSVAL QBASPOOL 'new-minimum-size-in-KB'</pre>
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This
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corresponds to pool 2 on the WRKSYSSTS display.</blockquote>
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</div>
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<div class="note"><span class="notetitle">Note:</span> The QBASPOOL
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system value only controls the minimum size of the base pool. The Base pool
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contains all of the storage that is not allocated to other pools.</div>
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</div>
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</div>
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</div>
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<div class="nested1" xml:lang="en-us" id="cbichgpoolsize"><a name="cbichgpoolsize"><!-- --></a><h2 class="topictitle2">Change the size of a shared pool</h2>
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<div><div class="section"><strong>Command</strong>: Change Shared Storage Pool (<span class="cmdname">CHGSHRPOOL</span>)<p>The
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changes to shared pools take effect immediately if the shared pool is active
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and sufficient storage is available. </p>
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<p><strong>Command</strong>: Work with Shared
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Storage Pools (<span class="cmdname">WRKSHRPOOL</span>)</p>
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<p>This command gives you
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access to the names and status information of shared pools. By using the menu
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options you can change values for pool size and maximum activity levels.</p>
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</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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