64 lines
3.9 KiB
HTML
64 lines
3.9 KiB
HTML
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<title>Use disk pools for improved performance</title>
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</head>
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<body id="hdraspimprf"><a name="hdraspimprf"><!-- --></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">Use disk pools for improved performance</h1>
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<div><p>If you are using user disk pools for better system performance, consider
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dedicating a disk pool to one object that is very active. In this case, you
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can configure the disk pool with only one disk unit.</p>
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<p>However, it typically does not improve performance to place a single device
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parity-protected unit in a user disk pool because the performance of that
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unit is affected by other disk units in the device parity set.</p>
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<p>Allocating one user disk pool exclusively for journal receivers that are
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attached to the same journal can improve journaling performance. By having
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the journal and journaled objects in a separate disk pool from the attached
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journal receivers, there is no contention for journal receiver write operations.
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The units that are associated with the disk pool do not have to be repositioned
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before each read or write operation.</p>
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<p>The system spreads journal receivers across multiple disk units to improve
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performance. The journal receiver may be placed on up to ten disk units in
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a disk pool. If you specify the RCVSIZOPT(*MAXOPT1) or (*MAXOPT2) journal
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option, then the system may place the journal receiver on up to 100 disk units
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in a disk pool. If you add more disk units to the disk pool while the system
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is active, the system determines whether to use the new disk units for journal
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receivers the next time the change journal function is performed.</p>
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<p>Another way to improve performance is to make sure there are enough storage
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units in the user disk pool to support the number of physical input and output
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operations that are done against the objects in the user disk pool. You might
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have to experiment by moving objects to a different user disk pool and then
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monitoring performance in the disk pool to see if the storage units are used
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excessively. For more information about working with disk status (WRKDSKSTS
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command) to determine if the storage units have excessive use, see <a href="../rzaks/rzaks1.htm">Work Management</a>. If the units
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have excessive use, you should consider adding more disk units to the user
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disk pool.</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="rzalyaspsxmp.htm">Disk pool uses</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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