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    <title>Automatic Failover and Fallback </title>
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<a name="wp1072606"> </a><h1 class="pTitle">
Automatic Failover and Fallback

</h1>
<a name="wp1072607"> </a><p class="pBody">
As of Cisco MDS NX-OS Release 4.1(1a), SAN device virtualization supports automatic failover and 
fallback configurations for the virtual devices. In all of the earlier releases, when there was a failure, you 
needed to manually configure the device as primary to make it active. With the introduction of automatic 
failover and fallback configurations, the active device is distinguished from the primary device indicated 
by a (*) symbol. 

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1072608"> </a><li class="pSmartList1">Auto failover&#8212;When there is a failure, the failover auto attribute automatically shuts down the 
primary device and brings up the secondary device to active state. When the primary device comes 
back online, it requires user intervention to switchover.
</li>
<a name="wp1072609"> </a><li class="pSmartList1">Auto failover with fallback&#8212;In addition to automatic failover, when the primary device comes back 
online after a failover, the primary device is brought to active state and the secondary device moved 
to standby state.
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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