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280 lines
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<title>Frequently asked questions</title>
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<body id="rzalyfaq"><a name="rzalyfaq"><!-- --></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">Frequently asked questions</h1>
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<div><p>Here is a list of independent disk pool questions and answers. If you have
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a question that is not on this page, please contact us.</p>
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<p id="rzalyfaq__questions"><a name="rzalyfaq__questions"><!-- --></a><strong>General</strong></p>
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<ol><li><a href="#rzalyfaq__howiaspswork">How do independent disk pools work?</a></li>
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<li><a href="#rzalyfaq__switchvsstandalone">How can independent disk pools
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be implemented in my environment?</a></li>
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<li><a href="#rzalyfaq__structure">How should I structure my independent
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disk pools?</a></li>
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<li><a href="#rzalyfaq__diskpoolgroup">What is a disk pool group?</a></li>
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<li><a href="#rzalyfaq__geomirror">What is geographic mirroring?</a></li>
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</ol>
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<p><strong>iSeries™ Navigator
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graphical user interface</strong></p>
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<ol><li><a href="#rzalyfaq__accessdm">How do I access the iSeries Navigator
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disk management function?</a></li>
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<li><a href="#rzalyfaq__whatcanido">What is the difference between the disk
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management functions in iSeries Navigator and the character-based command
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interface?</a></li>
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<li><a href="#rzalyfaq__accessdst">How do I access the disk management function
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when the system is in dedicated service tools (DST) mode?</a></li>
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<li><a href="#rzalyfaq__sst">What is the service tools server?</a></li>
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<li><a href="#rzalyfaq__refresh">Why does the data I see in iSeries Navigator
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appear to be out of date?</a></li>
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<li><a href="#rzalyfaq__connectsts">Why can't I connect to the service tools
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server after I add the service table entry?</a></li>
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</ol>
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<p><strong>Configuring</strong></p>
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<ol><li><a href="#rzalyfaq__newdiskpool">How do I create a new disk pool or
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independent disk pool?</a></li>
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<li><a href="#rzalyfaq__creategroup">How do I create a disk pool group?</a></li>
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<li><a href="#rzalyfaq__configuregeo">How do I configure geographic mirroring?</a></li>
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</ol>
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<p><strong>Performance</strong></p>
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<ol><li><a href="#rzalyfaq__performance">Why is performance slow?</a></li>
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<li><a href="#rzalyfaq__geoperformance">Why is performance slow for geographic
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mirroring?</a></li>
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</ol>
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<p><strong>Troubleshooting</strong></p>
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<ol><li><a href="#rzalyfaq__nodiskunits">Why do no disk units appear as eligible
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to be added to my disk pool?</a></li>
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<li><a href="#rzalyfaq__devd">Why doesn't the device description get deleted
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when I delete the disk pool?</a></li>
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<li><a href="#rzalyfaq__devdcreated">Why do I get a message saying the device
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description is already created?</a></li>
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<li><a href="#rzalyfaq__udfscreated">Why does the primary or secondary disk
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pool I try to create appear to be a UDFS disk pool?</a></li>
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<li><a href="#rzalyfaq__libsinudfs">Why do I get a message that says my
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disk pool is not the right type when I try to create a library in it?</a></li>
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<li><img src="./delta.gif" alt="Start of change" /><a href="#rzalyfaq__CPDB716">What is a CPDB716 message,
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and how can it be fixed?</a><img src="./deltaend.gif" alt="End of change" /></li>
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</ol>
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<div class="section"><h4 class="sectionscenariobar">General</h4><p id="rzalyfaq__howiaspswork"><a name="rzalyfaq__howiaspswork"><!-- --></a><strong>How
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do independent disk pools work?</strong></p>
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<p>The key characteristic of an independent
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disk pool is its ability to be, of course, independent of the rest of the
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storage on a server. It is independent because the data in the independent
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disk pool is self-contained. This means that all of the necessary system
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information associated with the data resides within the independent disk
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pool. See <a href="rzalyhowiaspswork.htm">How independent disk pools work</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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<p id="rzalyfaq__switchvsstandalone"><a name="rzalyfaq__switchvsstandalone"><!-- --></a><strong>How
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can independent disk pools be implemented in my environment?</strong> </p>
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<p>There
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are two basic environments in which you can take advantage of independent
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disk pools: a multi-system environment managed by an iSeries cluster, and a single-system
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environment with a single iSeries server. See <a href="rzalyswitchablevsstandalone.htm">Switchable and stand-alone independent disk pools</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__structure"><a name="rzalyfaq__structure"><!-- --></a><strong>How should I structure my independent
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disk pools?</strong> </p>
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<p>IBM<sup>®</sup> provides some recommendations for structuring and
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populating your independent disk pools. See <a href="rzalystructure.htm">Recommended structure for independent disk pools</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__diskpoolgroup"><a name="rzalyfaq__diskpoolgroup"><!-- --></a><strong>What is a disk pool group?</strong> </p>
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<p>A
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disk pool group is made up of a primary disk pool and zero or more secondary
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disk pools. Each disk pool is independent in regard to data storage, but
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in the disk pool group they combine to act as one entity. See <a href="rzalydiskpoolgroups.htm">Disk pool groups</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__geomirror"><a name="rzalyfaq__geomirror"><!-- --></a><strong>What is geographic mirroring?</strong> </p>
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<p>Geographic
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mirroring is a function that generates a mirror copy of an independent disk
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pool on a system that is (optionally) geographically distant from the originating
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site for availability or protection purposes. See <a href="rzalygeographicmirror.htm">Geographic mirroring</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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</div>
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<div class="section"><h4 class="sectionscenariobar">iSeries Navigator graphical user interface</h4><p id="rzalyfaq__accessdm"><a name="rzalyfaq__accessdm"><!-- --></a><strong>How do I access the iSeries Navigator disk management function?</strong> </p>
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<p>Before
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you can access disk management functions in iSeries Navigator, you must complete
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some setup tasks. See <a href="rzalyaccessing.htm">Access
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disk management functions</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__whatcanido"><a name="rzalyfaq__whatcanido"><!-- --></a><strong>What is the difference between
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the disk management functions in iSeries Navigator and in the character-based
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(command) interface?</strong></p>
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<p>Support for many independent disk pool tasks
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are only available through iSeries Navigator. Almost all disk management functions
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that are available from the system service tools (SST) mode are available
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though iSeries Navigator.
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A number of disk management functions that are only available from the dedicated
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service tools (DST) mode are also available. </p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__accessdst"><a name="rzalyfaq__accessdst"><!-- --></a><strong>How do I access the disk management
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function when the system is in dedicated service tools (DST) mode?</strong> </p>
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<p>Beginning
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with V5R1, the Disk Units folder in iSeries Navigator is available when the
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system is in dedicated service tools (DST) mode.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__sst"><a name="rzalyfaq__sst"><!-- --></a><strong>What is the service tools server?</strong></p>
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<p>The
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service tools server allows you to use your PC to perform service tools functions
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through TCP/IP. Before you attempt to use any disk management functions,
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you must configure the service tools server. See <a href="rzalydst.htm">Set up communication</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__refresh"><a name="rzalyfaq__refresh"><!-- --></a><strong>Why does the data I see in the iSeries Navigator
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window appear to be out of date?</strong></p>
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<p>The disk management function in iSeries Navigator
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caches information, and therefore needs to be refreshed to have the most
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current data visible. After you make a configuration change, iSeries Navigator
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should refresh itself. If it does not, however, you can manually refresh
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it by clicking the Refresh button on the iSeries Navigator toolbar. You can also
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set iSeries Navigator
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to refresh periodically. Depending on the size of your server, however, you
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might not want to do this. Disk unit configuration data tends to be fairly
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static and does not need to be refreshed often. If your system is large,
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it can take a significant amount of time to download all information. </p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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<p id="rzalyfaq__connectsts"><a name="rzalyfaq__connectsts"><!-- --></a><strong>Why
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can't I connect to the service tools server after I add the service table
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entry?</strong></p>
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<p>The <a href="../cl/addsrvtble.htm">Add
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Service Table Entry (ADDSRVTBLE) command</a> is case sensitive. In particular,
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it is important to ensure that the Protocol = 'tcp', and not 'TCP'. To ensure
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this is the case, use the <a href="../cl/wrksrvtble.htm">Work with Service Table Entry (WRKSRVTBLE) command</a>,
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and check the as-sts server field. Make sure that TCP is lowercase. If it
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is not, then remove the entry, and re-create it by issuing the following
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command exactly as shown: </p>
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<p><tt>ADDSRVTBLE SERVICE('as-sts') PORT(3000)
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PROTOCOL('tcp') TEXT('Service Tools Server') ALIAS('AS-STS')</tt></p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Configuring</h4><p id="rzalyfaq__newdiskpool"><a name="rzalyfaq__newdiskpool"><!-- --></a><strong>How
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do I create a new independent disk pool?</strong> </p>
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<p>You can create an independent
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disk pool in a clustered, multisystem environment or on a single system.
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See the following topics for details:</p>
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<ul><li><a href="rzalycreateswitchableiasp.htm">Create a switchable independent disk pool</a> </li>
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<li><a href="rzalycreatestandaloneiasp.htm">Create a dedicated independent disk pool</a></li>
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</ul>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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<p id="rzalyfaq__creategroup"><a name="rzalyfaq__creategroup"><!-- --></a><strong>How
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do I create a disk pool group?</strong> </p>
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<p>See <a href="rzalycreatediskpoolgroup.htm">Create a new disk pool group</a> for details.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__configuregeo"><a name="rzalyfaq__configuregeo"><!-- --></a><strong>How do I configure geographic
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mirroring?</strong> </p>
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<p>You can configure geographic mirroring for independent
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disk pools that are dedicated or switchable between systems. See the following
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topics for details:</p>
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<ul><li><a href="rzalyconfiguregeographic.htm">Configure geographic mirroring with dedicated independent disk pools</a></li>
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<li><a href="rzalyconfigureswitchgeographic.htm">Configure geographic mirroring with switchable independent disk pools</a></li>
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</ul>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Performance</h4><p id="rzalyfaq__performance"><a name="rzalyfaq__performance"><!-- --></a><strong>Why
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is performance slow?</strong></p>
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<p>There are several factors that can influence
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performance. Make sure your PC's TCP/IP settings are configured correctly.
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Specifically, make sure that you do not have an incorrect secondary gateway.
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If you do have a secondary gateway, remove it. This should provide a significant
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increase in performance. See <a href="rzalyrequirementsforgeographicmirroring.htm">Requirements
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for geographic mirroring </a>for more detailed information.</p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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<p id="rzalyfaq__geoperformance"><a name="rzalyfaq__geoperformance"><!-- --></a><strong>Why
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is performance slow for geographic mirroring?</strong></p>
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<p>For geographic mirroring
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you should consider the distance that the independent disk pool is being mirrored.
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The type and number of communication lines as well as their bandwidth have
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an effect on performance. You can configure up to four TCP/IP communication
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interfaces on multiple adapters. You should consider configuring multiple
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communication lines to allow for the highest performance. The volume of disk
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unit writes that your applications require also plays a role in the performance
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of your geographically mirrored independent disk pool.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Troubleshooting</h4><p id="rzalyfaq__nodiskunits"><a name="rzalyfaq__nodiskunits"><!-- --></a><strong>Why do no disk units appear as eligible to be added to
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my disk pool?</strong></p>
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<p>There are a number of possible reasons for this.
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First, you must have an unconfigured disk unit to add. If the disk pool
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is protected, you can only add parity disks, or disks in pairs, so that they
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can be mirrored.</p>
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<p>If your system is in a clustered environment, disk
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unit eligibility is more complex. Each disk unit is assigned a rank,
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which indicates its eligibility to be added to a particular disk pool.
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If the rank of the disk unit is above 300, then the disk is ineligible. A
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complete list of the ranks, and what they mean, is available in the disk
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management online help.</p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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<p id="rzalyfaq__devd"><a name="rzalyfaq__devd"><!-- --></a><strong>Why doesn't the device description get deleted when I delete
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the disk pool?</strong></p>
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<p>Because the device description does not always get
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created by the disk management function, it might not be deleted when the
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disk pool gets deleted. You need to manually delete it using the <a href="../cl/dltdevd.htm">Delete Device Description (DLTDEVD)
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command</a>.</p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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<p id="rzalyfaq__devdcreated"><a name="rzalyfaq__devdcreated"><!-- --></a><strong>Why do I get a message saying the device description
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is already created?</strong></p>
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<p>When you create a new independent disk pool,
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an attempt is made to create an associated device description. If a device
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description of the same name as the disk pool already exists, you will receive
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a warning message, and the existing device description will not be changed.
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Most of the time, this is not a problem. However, if the device description's
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name and associated resource do not match, this becomes a problem, and this
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is why you receive the warning message.</p>
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<p><a href="#rzalyfaq__questions">Back
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to questions</a></p>
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<p id="rzalyfaq__udfscreated"><a name="rzalyfaq__udfscreated"><!-- --></a><strong>Why does the primary or secondary
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disk pool that I try to create appear to be a UDFS disk pool?</strong></p>
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<p>If iSeries Navigator
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failed or was closed while the disk pool was being created, you might need
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to <a href="rzalyconvertudfs.htm">Convert UDFS disk pools</a> to a primary or
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secondary disk pool. </p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></p>
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<p id="rzalyfaq__libsinudfs"><a name="rzalyfaq__libsinudfs"><!-- --></a><strong>Why do I get a message that says my disk pool is not the
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right type when I try to create a library in it?</strong></p>
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<p>Make sure that
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the disk pool you are trying to create a library in is a primary or secondary
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disk pool, not a UDFS disk pool. If the disk pool is a UDFS disk pool and
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you want to create a library in it, you need to <a href="rzalyconvertudfs.htm">Convert UDFS disk pools</a> to a primary or secondary disk pool.</p>
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<p id="rzalyfaq__CPDB716"><a name="rzalyfaq__CPDB716"><!-- --></a><img src="./delta.gif" alt="Start of change" /><span class="uicontrol">What is a CPDB716 message, and how can it be fixed?</span><img src="./deltaend.gif" alt="End of change" /></p>
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<p>When a copy from an original ASP is made and there is an attempt
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to vary on the copy on the system that had used the original ASP, message
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CPDB716 appears. Before the system accepts the copy, an IPL must be performed. </p>
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<p><a href="#rzalyfaq__questions">Back to questions</a></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="rzalyoverview.htm" title="If you are interested solely in independent disk pools, use this information to help you plan, configure, and manage independent disk pools.">Using independent disk pools</a></div>
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</div>
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</div>
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</body>
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</html> |