113 lines
7.0 KiB
HTML
113 lines
7.0 KiB
HTML
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<title>How independent disk pools work</title>
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<body id="rzalyhowiaspswork"><a name="rzalyhowiaspswork"><!-- --></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">How independent disk pools work</h1>
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<div><p>The key characteristic of an independent disk pool is its ability to be,
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of course, <em>independent</em> of the rest of the storage on a server. It
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is independent because the data in the independent disk pool is self-contained.
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This means that all of the necessary system information associated with the
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data resides within the independent disk pool. The unique qualities of an
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independent disk pool allow it to be switched in a multisystem environment
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and to be made available and unavailable in a single-system environment.</p>
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<p>Independent disk pools are available only when you choose to make them
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available; they are not made available when you restart your server, unless
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you include code (<a href="rzalystartup.htm">Example: Make independent disk pool available at startup</a>) to
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make them available. When you select to make a disk pool available, the disk
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pool goes through a process similar to that of restarting the server. While
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this processing takes place, the disk pool is in an Active state.</p>
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<p>While the disk pool is in Active state, recovery steps are being performed.
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The disk pool is synchronized with other disk pools that may be in the disk
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pool group. Also, journaled objects are synchronized with their associated
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journal. System libraries are created for the primary disk pool: QSYSnnnnn,
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QSYS2nnnnn, QRCLnnnnn, QRCYnnnnn, QRPLnnnnn, SYSIBnnnnn (where <em>nnnnn</em> is
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the primary disk pool number, right-aligned and padded with zeros). For example,
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the QSYS library for independent disk pool 33 is QSYS00033. </p>
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<p>At this time database cross-reference files will also be updated. The system
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libraries for the independent disk pool, QSYSnnnnn and QSYS2nnnnn, contain
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metadata not only for the independent disk pool, but also for the system disk
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pool. When the disk pool is made available, database cross-referencing clears
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the information related to SYSBAS and updates it with current information.
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The number and complexity of database file objects and SQL packages, procedures,
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and functions that need to be updated will play a role in the time it takes
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to make the disk pool available.</p>
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<p>As the independent disk pool is made available, several server jobs are
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started to support the independent disk pool. In order for server jobs to
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remain unique on the server, those that service the independent disk pool
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are given their own simple job name when the disk pool is made available.
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The server jobs are essential to the operation of the disk pool; do not tamper
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with these server jobs. The following is a list of server jobs that are created
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(nn = number):</p>
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<ol><li><span class="uicontrol">QDBXnnnXR</span> - handles database cross-reference file
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server functions</li>
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<li><span class="uicontrol">QDBXnnnXR2</span> - handles database cross-reference field
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(column) information</li>
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<li><span class="uicontrol">QDBnnnSV01</span> - handles database, journal, and commitment
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control events</li>
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<li><span class="uicontrol">QDBnnnSV02 through QDBnnnSVnn</span> - high priority jobs
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that service the database</li>
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<li><span class="uicontrol">QDBnnnSVnn through QDBnnnSVnn</span> - low priority jobs
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that service the database</li>
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</ol>
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<p>When the recovery process is completed, the disk pool is in an Available
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state, ready for you to use. When you make a disk pool group available, you
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will see a completion messages for each disk pool. If the make available process
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encounters problems, such as an object not synchronized with a journal, you
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will need to resolve the issues reported in the error messages. See the job
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log, the system operator message queue, and the history log to locate problems
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and to verify the make available process.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzalysupportedunsupportedobjects.htm">Supported and unsupported object types</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalydatabases.htm">Independent disk pools with distinct databases</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalymultiplesystemlibraries.htm">Multiple system libraries</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyobjectidentification.htm">Object identification</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyprintingconsiderations.htm">Printing considerations</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyswitchbetweenv5r1andv5r2.htm">Switching independent disk pool between different releases</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalystartup.htm">Example: Make independent disk pool available at startup</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalyconcepts.htm">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>
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