Virtual machine based controller and upgrade mechanism
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United States of America Patent
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Jan 26, 2016
Grant Date -
Apr 10, 2014
app pub date -
Nov 5, 2013
filing date -
Oct 5, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
High availability for a network may be achieved, for example, during a hitless upgrade by creating a replica controller virtual machine of an operating controller virtual machine (source controller). The replica controller virtual machine may be on a same or different server as the source controller virtual machine. The replica controller virtual machine may be copied with processes present in the source controller virtual machine and synchronized for runtime state. Upgrades or changes to software applications run in the source controller virtual machine may be provided to the replica controller virtual machine. Once enabled, the replica controller virtual machine may be operated without suspension of the source controller virtual machine.
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