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HTML
161 lines
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<meta name="DC.Title" content="Create a switchable independent disk pool" />
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<title>Create a switchable independent disk pool</title>
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<body id="rzalycreateswitchableiasp"><a name="rzalycreateswitchableiasp"><!-- --></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">Create a switchable independent disk pool</h1>
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<div><p>Before you attempt to do switchable independent disk pools, ensure that
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you have satisfied the hardware, software, communications, and physical planning
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requirements. See <a href="rzalyplan.htm">Plan for independent disk pools</a>.</p>
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<p>iSeries™ Navigator
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is the recommended interface for creating and managing independent disk pools.
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Wizards in the clusters and disk management components simplify the tasks
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and guide you through the process. For some disk management tasks, iSeries Navigator
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is the only option. Make sure you have fulfilled the <a href="rzalyplanning.htm">iSeries Navigator requirements for disk management</a>. </p>
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<p>After an expansion unit (frame/unit) is configured
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as switchable, the disk units in these resources cannot be used in independent
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disk pools that span different Cluster Resource Groups (CRGs). Even when only
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one node is defined and no switching will actually be enabled, configuring
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that expansion unit as switchable is enough to cause this constraint to be
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enforced. </p>
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<div class="section"><h4 class="sectiontitle">Using iSeries Navigator</h4><div class="p"> To create a switchable
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independent disk pool using iSeries Navigator, do the following: <ol><li><a href="rzalycreatecluster.htm">Create a cluster</a>. To use switchable
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independent disk pools, an iSeries cluster is required.</li>
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<li><a href="rzalymakehardwareswitchable.htm">Make your hardware switchable</a>. If
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you have a stand-alone expansion unit or an IOP that contains disk units that
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are to be included in an independent disk pool, you must authorize the expansion
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unit or IOP to grant access to other nodes. </li>
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<li><a href="rzalycreatecrg.htm">Create a switchable hardware group</a>. A switchable hardware
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group, also known as a device CRG, defines the switchable independent disk
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pool. This is what manages the switching of the device. This wizard takes
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you through the steps to create a new switchable hardware group. It will
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also guide you through the New Disk Pool wizard which will assist you in
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creating a new disk pool and adding disk units to it for the cluster. <div class="note"><span class="notetitle">Note:</span> If
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you had switchable software products which conform to specific iSeries Navigator
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cluster guidelines installed when you ran the New Cluster wizard in step
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1, the New Cluster wizard may have already prompted you to create a switchable
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hardware group. If the New Cluster wizard did not detect that a switchable
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software product was installed, then you have not created the switchable
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hardware group.</div>
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</li>
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<li><a href="rzalyprintgraphview.htm">Print your disk configuration</a>.
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Print your disk configuration to have in case a recovery situation occurs.
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Also, record the relationship between the independent disk pool name and number.
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</li>
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</ol>
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You have now created a switchable independent disk pool. To prepare it
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for use, do the following:<ol><li><a href="rzalystartcrg.htm">Start switchable hardware group</a>. Start the switchable
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hardware group to enable device resiliency for the switchable hardware group.</li>
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<li><a href="rzalymakediskpoolavailable.htm">Make a disk pool available</a>. To
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access the disk units in an independent disk pool, you must make the disk
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pool available (vary on) the disk pool.</li>
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<li><a href="../rzaig/rzaigmanageperformswitchover.htm">Perform
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a test switchover</a>. Before you add data to the disk pool, perform a
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test switchover on the switchable hardware group you created to ensure the
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configuration functions as you planned. </li>
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</ol>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Using CL commands and APIs</h4><p>To create a switchable
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independent disk pool using CL commands and APIs, do the following: </p>
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<div class="p"><blockquote>You
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can use CL commands and APIs for creating a switchable independent disk pool,
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however there are some tasks that require that you use iSeries Navigator. <ol><li><strong>Create the cluster.</strong> Create the cluster with required node using
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the <a href="../cl/crtclu.htm">CRTCLU (Create
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Cluster) Command</a>. </li>
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<li><strong>Start the nodes that comprise the cluster.</strong> Start
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the nodes in the cluster using the <a href="../cl/strclunod.htm">STRCLUNOD (Start Cluster Node) Command</a></li>
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<li><strong>Create the device domain.</strong> You must create the device domain for
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all nodes involved in switching an independent disk pool or set of independent
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disk pools using the <a href="../cl/adddevdmne.htm">ADDDEVDMNE
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(Add Device Domain Entry) command</a>.</li>
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<li><strong>Create the device descriptions.</strong> Device descriptions must be created
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on each node that will be in the cluster resource group (CRG). Use the <a href="../cl/crtdevasp.htm">CRTDEVASP (Create Device
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Description (ASP)) Command</a>. On the command line in the character-based
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interface, enter CRTDEVASP. In the <strong>Resource Name</strong> and the <strong>Device
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Description</strong> fields, enter the name of the independent disk pool you plan
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to create. </li>
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<li><strong>Create the cluster resource group.</strong> Create the device CRG with the
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nodes, their roles in the recovery domain, and independent disk pool device
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descriptions using the <a href="../cl/crtcrg.htm">CRTCRG
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(Create Cluster Resource Group) Command</a>.</li>
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<li><strong><a href="rzalymakehardwareswitchable.htm">Make your hardware switchable</a></strong>.
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If you have a stand-alone expansion unit or an IOP that contains disk units
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that are to be included in an independent disk pool, you must authorize the
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expansion unit or IOP to grant access to other nodes <strong>(iSeries Navigator
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required)</strong>.</li>
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<li>. Create the disk pool on the node that owns the disk units using the
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New Disk Pool wizard when the server is fully restarted. Make sure clustering
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is active before you start. Name the independent disk pool to match the
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device description resource name that you gave in step 3. As you add disk
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units, it is best to localize disk units in the same expansion unit or IOP.
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Do not spread the disk pool across more device parity sets than necessary.</li>
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<li><strong>Print your disk configuration</strong>. Print your disk configuration to
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have in case of a recovery situation. See How to display your disk configuration
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in <a href="../books/sc415304.pdf" target="_blank">Backup and Recovery</a>. <img src="wbpdf.gif" alt="Link to PDF" /> Also, record
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the relationship between the independent disk pool name and number. <p>You
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have now created a switchable independent disk pool. The remaining steps
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are required to prepare it for use. </p>
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</li>
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<li><strong>Start the cluster resource group</strong>. Start the cluster resource group
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to enable device resiliency using the <a href="../cl/strcrg.htm">STRCRG (Start Cluster Resource Group) Command</a>. </li>
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<li><strong>Make the disk pool available</strong>. To access the disk units in an independent
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disk pool you must vary on the disk pool using the <a href="../cl/vrycfg.htm">VRYCFG (Vary Configuration) command</a>.</li>
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<li><strong>Perform a test switchover</strong>. Before you add data to the disk pool,
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perform a test switchover to ensure the configuration functions as you planned.
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Use the <a href="../cl/chgcrgpri.htm">CHGCRGPRI
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(Change CRG Primary)</a> command.</li>
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</ol>
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</blockquote>
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</div>
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<p>You are now ready to populate the independent disk pool
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with directories and libraries. Before you do, be sure to read <a href="rzalydatabases.htm">Independent disk pools with distinct databases</a>.</p>
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</div>
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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="rzalycreatecluster.htm">Create a cluster</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalycreatecrg.htm">Create a switchable hardware group</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalystartcrg.htm">Start switchable hardware group</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalycreatediskpool.htm">Create a disk pool</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyprintgraphview.htm">Print your disk configuration</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="rzalyconfigure.htm">Configure 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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