61 lines
4.0 KiB
HTML
61 lines
4.0 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-13" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Storage space balancing</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<img src="delta.gif" alt="Start of change" /><img src="delta.gif" alt="Start of change" />
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<a name="rzahqperfstoragespacebalancing"></a>
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<h3 id="rzahqperfstoragespacebalancing">Storage space balancing</h3>
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<p>When a storage space is created, the data is spread across the disks in
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a user specified Auxiliary Storage Pool (ASP), or Independent Auxiliary Storage
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Pool (IASP). The disks in the pool may be configured to be unprotected, parity
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protected (RAID-5), or with mirrored protection. Unprotected disks provide
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no protection against disk failures. Parity protected disks maintain parity
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sets which allow the recovery if a disk fails in a parity set (but at a performance
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cost). Mirroring provides protection against disk failures, but with much
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better performance than parity. The integrated server gains the benefits of
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the efficient iSeries™ storage architecture, regardless of how an ASP
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or IASP is configured.</p>
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<p>The iSeries sever has functions to help maintain the efficient spread of
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data across the disks. One example is the Start Disk Reorganization (STRDSKRGZ)
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operation, which balances disk storage utilization. Another is the "Add
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units to ASPs and balance data" available when hard disk resources are
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assigned to an ASP. On integrated servers, a storage space will only be moved
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or rebalanced across disks while the linked server is varied off.</p>
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<p>The location of the data associated with a storage space is usually automatically
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managed by the iSeries. There is no need to configure striped volumes
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or software RAID of the disks within the Windows operating system. Configuring
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these features in the Windows operating system may actually slow the effective
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disk operations. Even though the storage is spread across the iSeries disks in
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small extents, continue to defragment the associated disk on Windows to maintain
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efficient file-system data structures.</p>
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<p>You can monitor how well the iSeries is fulfilling the integrated server's
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disk requirements by using the Work with Disk Status (WRKDSKSTS), Work with
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Network Server Storage Spaces (WRKNWSSTG), and Work with Network Server Status
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(WRKNWSSTS) commands. For other performance considerations, realize that integrated
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servers are Microsoft® Windows servers. You can use Microsoft's
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Windows Performance Monitor as you would on any other server. See your Microsoft Windows documentation for information about using the Performance
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Monitor.</p><img src="deltaend.gif" alt="End of change" /><img src="deltaend.gif" alt="End of change" />
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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