07-11-2012
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Join Date: Jun 2011
Last Activity: 3 May 2015, 12:12 PM EDT
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My question to you: is there any significant performance issue? Are you planning to update your applications that may require updated kernel?
If your answers are "No", then I would say let the things be as they are now. 2 years of uptime is nothing, Linux on rock solid platforms like Power, can give uptime of a decade if there is no patching/upgrading of software or hardware.