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<meta name="DC.Title" content="Configure geographic mirroring with dedicated independent disk pools" />
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<title>Configure geographic mirroring with dedicated independent disk pools</title>
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<body id="rzalyconfiguregeographic"><a name="rzalyconfiguregeographic"><!-- --></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">Configure geographic mirroring with dedicated independent disk pools</h1>
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<div><p>To configure geographic mirroring, you must
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first configure your cross-site mirroring (XSM) environment and create the
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independent disk pool that you want to mirror. This includes defining your
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primary and backup nodes within the recovery domain. Before using iSeries™ Navigator,
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you should also define at least one and as many as four data port TCP/IP addresses,
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which would constitute one or more one-to-one bidirectional routes as part
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of the connection between the production copy nodes and the mirror copy nodes.
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Geographic mirroring will allow you to maintain an exact copy of the independent
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disk pool on a system at a different location for protection and availability
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purposes. </p>
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<p>The following figure shows an example configuration for geographic mirroring.
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Primary Node A in New York City is the source system for the production copy
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of the independent disk pool that is dedicated to Node A. Node B is the backup
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system in Boston that is the target node for the mirror copy of the independent
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disk pool that is dedicated to Node B.</p>
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<img src="rzaly508.gif" alt="This is an example shows the configuration for geographic mirroring." /><div class="section"><h4 class="sectiontitle">Configured geographic mirroring</h4><p><a href="rzalycommunications.htm">Communications requirements</a></p>
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<p><a href="../rzai2/rzai2custom.htm">Customize TCP/IP
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with iSeries Navigator</a></p>
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<p>To
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configure your geographic mirroring with the iSeries Navigator, follow these steps:</p>
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<div class="p"><ol><li>Plan and configure your data port TCP/IP routes.</li>
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<li><a href="rzalycreatecluster.htm">Create a cluster</a>. </li>
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<li><a href="rzalycreatediskpool.htm">Create the independent
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disk pool </a> that you want to mirror.</li>
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<li>Create the device cluster resource group, also known as switchable hardware
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group, for the independent disk pool that you just created:<ol type="a"><li>In iSeries Navigator,
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expand <span class="uicontrol">Management Central</span>. </li>
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<li>Expand <span class="uicontrol">Clusters</span>. </li>
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<li>Expand the cluster for which you need to add a switchable hardware group.
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</li>
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<li>Right-click <span class="uicontrol">Switchable Hardware</span>, and select <span class="uicontrol">New
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Group</span>. </li>
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<li>On the Create new or add existing disk pool dialog box, select <span class="uicontrol">No,
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add an existing switchable disk pool to the switchable hardware group</span>.</li>
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</ol>
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</li>
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<li>Define your geographic mirroring sites in the recovery domain:<ol type="a"><li>Right-click the newly created switchable hardware group and select <span class="uicontrol">Properties</span>.</li>
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<li>Select the <span class="uicontrol">Recovery Domain</span> tab.</li>
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<li>Select the primary node and click <span class="uicontrol">Edit</span>.</li>
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<li><img src="./delta.gif" alt="Start of change" />In the site name field, specify the primary site for the
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production copy. Since this example contains two nodes, each of the nodes
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must have a different site name, with one node per site. In environments
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with more that two nodes, the site with more than one node must have an independent
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disk pool in either a hardware tower or IOP which can be switched between
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nodes within the same site, In this case, nodes within that site would have
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the same site name.<div class="note"><span class="notetitle">Note:</span> The site name for the production and
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mirror copy can not be the same.</div>
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<img src="./deltaend.gif" alt="End of change" /></li>
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<li>Click <span class="uicontrol">Add</span> to specify the data port IP addresses
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of the primary node.</li>
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<li>On the Edit Node dialog, specify the data port IP addresses for the primary
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node that you setup in step 1, Plan and configure your TCP/IP, and click <span class="uicontrol">OK</span>. You can configure up to four
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data port IP addresses in a one-to-one manner, one port to one port, each
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port independent of the other. You should consider configuring multiple communication
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lines to allow for redundancy and the highest throughput. The same number
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of ports used here should be configured on the mirroring node. </li>
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<li>On the General tab, click <span class="uicontrol">OK</span>.</li>
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<li>Repeat the previous steps to specify the site name and IP addresses for
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the mirror copy node.</li>
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</ol>
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</li>
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<li>After you have completed the XSM prerequisites, follow these steps to
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configure geographic mirroring: <ol type="a"><li>In iSeries Navigator,
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expand <span class="uicontrol">My Connections</span> (or your active environment).</li>
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<li>Expand the primary node on the source iSeries server.</li>
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<li>Expand <span class="uicontrol">Configuration and Service</span>><span class="uicontrol">Hardware</span>><span class="uicontrol">Disk
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Units</span>><span class="uicontrol">Disk Pools</span>.</li>
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<li>If the Geographic Mirroring columns are not
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displayed, click the Disk Pool you want to mirror, and select <span class="uicontrol">View</span>><span class="uicontrol">Customize
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this view</span>><span class="uicontrol">Columns</span>, then select the columns
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with the suffix Geographic Mirroring from the <span class="uicontrol">Columns available
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to display list</span>.</li>
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<li>Right-click the Disk Pool you want to mirror, and select <span class="uicontrol">Geographic
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Mirroring> Configure Geographic Mirroring</span>.</li>
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<li>Follow the wizard's instructions to configure geographic mirroring.<div class="note"><span class="notetitle">Note:</span> The
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disk pools you select to geographically mirror must be in the same switchable
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hardware group. If you want to geographically mirror disk pools in more than
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one switchable hardware group, you need to complete the wizard one time for
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each switchable hardware group.</div>
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</li>
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</ol>
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</li>
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<li>You have now configured geographic mirroring. The remaining steps are
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required to prepare the independent disk pool for use in this environment.
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See <a href="rzalyprintgraphview.htm">Print your disk configuration</a>. Print your
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disk configuration to have in case a recovery situation occurs. Also, record
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the relationship between the independent disk pool name and number. </li>
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</ol>
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<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>Wait for resync to complete. </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 to ensure the backup node can become the primary node and
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the primary node can become the backup node. </li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> If you remove a node from a device domain after you configure geographic
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mirroring, the removed node takes any production copies or mirror copies that
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it owns. These nodes are changed to nongeographic mirrored disk pools.</div>
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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 configure your geographic
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mirroring with the CL commands and APIs, follow these steps:</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>Plan and configure your data port TCP/IP routes on all nodes in the recommended
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manner as follows:<ul><li>Node A should have routes to C and D.</li>
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<li>Node B should have routes to C and D.</li>
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<li>Node C should have routes to A and B.</li>
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<li>Node D should have routes to A and B.</li>
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</ul>
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</li>
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<li><strong>Create the cluster.</strong> Create the cluster with the nodes that you
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want using the <a href="../cl/crtclu.htm">CRTCLU
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(Create Cluster) command</a>. </li>
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<li><span class="uicontrol">Start the nodes that comprise the
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cluster.</span> Start the nodes in the cluster using the <a href="../cl/strclunod.htm">STRCLUNOD (Start Cluster Node) command</a></li>
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<li><span class="uicontrol">Create the device domain.</span> You must create the device
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domain for all nodes involved in switching an independent disk pool using
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the <a href="../cl/adddevdmne.htm">ADDDEVDMNE
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(Add Device Domain Entry) command</a>.</li>
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<li><span class="uicontrol">Create the device descriptions.</span> Device descriptions
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must be created on each node that will be in the cluster resource group (CRG).
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Use the <a href="../cl/crtdevasp.htm">CRTDEVASP
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(Create Device Description (ASP)) command</a>. On the command line in the
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character-based interface, enter CRTDEVASP. In the <span class="uicontrol">Resource Name</span> and
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the <span class="uicontrol">Device Description</span> fields, enter the name of the
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independent disk pool you plan to create. </li>
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<li><span class="uicontrol">Create the cluster resource group.</span> Create the device
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CRG with the nodes, their roles in the recovery domain, and the independent
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disk pool device descriptions. You must also specify a site name and data
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port IP addresses for each node in the recovery domain. Use the <a href="../cl/crtcrg.htm">CRTCRG (Create Cluster Resource Group)
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command</a>.</li>
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<li><a href="rzalycreatediskpool.htm">Create a disk pool</a>. Create the
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disk pool on the node that owns the disk units using the New Disk Pool wizard
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when the server is fully restarted. Make sure clustering is active before
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you start. Name the independent disk pool to match the device description
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resource name that you gave in step 3. As you add disk units, it is best
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to localize disk units in the same expansion unit or IOP. Also, do not spread
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the disk pool across device parity sets <strong>(iSeries Navigator required)</strong>.</li>
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<li>Follow these steps to configure geographic mirroring:<ol type="a"><li>In iSeries Navigator,
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expand <span class="uicontrol">My Connections</span> (or your active environment).</li>
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<li>Expand any iSeries server.</li>
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<li>Expand <span class="uicontrol">Configuration and Service</span>.</li>
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<li>Expand <span class="uicontrol">Hardware</span>.</li>
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<li>Expand <span class="uicontrol">Disk Units</span>.</li>
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<li>Expand <span class="uicontrol">Disk Pools</span>.</li>
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<li>Right-click the Disk Pool you want to mirror and select <span class="uicontrol">Geographic
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Mirroring</span> > C<span class="uicontrol">onfigure Geographic Mirroring</span>.</li>
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<li>Follow the wizard's instructions to configure geographic mirroring.<div class="note"><span class="notetitle">Note:</span> The
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disk pools you select to geographically mirror must be in the same switchable
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hardware group. If you want to geographically mirror disk pools in more than
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one switchable hardware group, you will need to complete the wizard one time
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for each switchable hardware group.</div>
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</li>
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</ol>
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</li>
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<li><span class="uicontrol">Print your disk configuration</span>. Print your disk
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configuration to have in case of a recovery situation. See How to display
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your disk configuration in <a href="../books/sc415304.pdf">Backup and Recovery</a>. <img src="wbpdf.gif" alt="Link to PDF" /> Also, record the relationship between the independent
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disk pool name and number. <p>You have now configured geographic mirroring.
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The remaining steps are required to prepare the independent disk pool for
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use in this environment. </p>
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</li>
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</ol>
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<p>You have now configured geographic mirroring. The remaining steps
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are required to prepare the independent disk pool for use in this environment.</p>
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<ol><li><span class="uicontrol">Start the cluster resource group</span>.
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Start the cluster resource group to enable device resiliency using the <a href="../cl/strcrg.htm">STRCRG (Start Cluster
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Resource Group) command</a>. </li>
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<li><span class="uicontrol">Make the disk pool available</span>.
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To access the disk units in an independent disk pool you must vary on the
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disk pool using the <a href="../cl/vrycfg.htm">VRYCFG
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(Vary Configuration) command</a>. Vary on will also reconnect connections,
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so that any new route definitions can take effect.</li>
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<li><span class="uicontrol">Perform a test switchover</span>. Before you add data
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to the disk pool, perform a test switchover to ensure the backup node can
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become the primary node and the primary node can become the backup node. Use
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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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</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="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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