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Chen, Junjie
3b672beb23
Reviewed-by: Mützel, Andrea <andrea.muetzel@t-systems.com> Co-authored-by: Chen, Junjie <chenjunjie@huawei.com> Co-committed-by: Chen, Junjie <chenjunjie@huawei.com>
19 lines
3.2 KiB
HTML
19 lines
3.2 KiB
HTML
<a name="dcs-ug-0312017"></a><a name="dcs-ug-0312017"></a>
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<h1 class="topictitle1">Performing a Master/Standby Switchover for a DCS Instance</h1>
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<div id="body8662426"><p id="dcs-ug-0312017__en-us_topic_0148195327_p10475634142113">On the DCS console, you can manually switch the master and standby nodes of a DCS instance. This operation is used for special purposes, for example, releasing all service connections or terminating ongoing service operations.</p>
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<p id="dcs-ug-0312017__en-us_topic_0148195327_p175621436145814">Only master/standby instances support a master/standby node switchover.</p>
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<div class="notice" id="dcs-ug-0312017__en-us_topic_0148195327_note14252125916413"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><ul id="dcs-ug-0312017__en-us_topic_0148195327_ul1480317191213"><li id="dcs-ug-0312017__en-us_topic_0148195327_li45491925141411">Services may be interrupted for up to 10 seconds during the switchover. Before performing a switchover, ensure that your application supports reconnection.</li><li id="dcs-ug-0312017__en-us_topic_0148195327_li38081741211">During a master/standby node switchover, a large amount of resources will be consumed for data synchronization between the master and standby nodes. You are advised to perform this operation during off-peak hours.</li><li id="dcs-ug-0312017__en-us_topic_0148195327_li57614118214">Data of the maser and standby nodes is synchronized asynchronously. Therefore, a small amount of data that is being operated on during the switchover may be lost.</li></ul>
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</div></div>
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<div class="section" id="dcs-ug-0312017__en-us_topic_0148195327_section46727122"><h4 class="sectiontitle">Prerequisites</h4><p id="dcs-ug-0312017__en-us_topic_0148195327_p63863782">The DCS instance for which you want to perform a master/standby node switchover is in the <strong id="dcs-ug-0312017__en-us_topic_0148195327_b14415121015127">Running</strong> state.</p>
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</div>
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<div class="section" id="dcs-ug-0312017__en-us_topic_0148195327_section321623193712"><h4 class="sectiontitle">Procedure</h4><ol id="dcs-ug-0312017__en-us_topic_0148195327_ol15486424193825"><li id="dcs-ug-0312017__li1799392835619"><span>Log in to the DCS console.</span></li><li id="dcs-ug-0312017__li1111153715310"><span>Click <span><img id="dcs-ug-0312017__image15111163720532" src="en-us_image_0000001194523047.png"></span> in the upper left corner and select a region and a project.</span></li><li id="dcs-ug-0312017__li18411387341"><span>In the navigation pane, choose <strong id="dcs-ug-0312017__b11236128155611">Cache Manager</strong>.</span></li><li id="dcs-ug-0312017__en-us_topic_0148195327_li58407294193825"><span>In the <strong id="dcs-ug-0312017__en-us_topic_0148195327_b4734125011518">Operation</strong> column of the instance, choose <strong id="dcs-ug-0312017__en-us_topic_0148195327_b3734105020510">More</strong> > <strong id="dcs-ug-0312017__en-us_topic_0148195327_b157341150155">Master/Standby Switchover</strong>, then click <strong id="dcs-ug-0312017__b84122415329">OK</strong>.</span></li></ol>
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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="dcs-ug-0312015.html">Operating DCS Instances</a></div>
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</div>
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</div>
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