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I was seeing extremely slow CIFS performance on servers with HP NIC teams. This includes our vRanger backup server. I would map a drive and it would take minutes to come up, etc. I finally found a NOW article suggesting to run:
options ip.fastpath.enable off
This command, from my understanding, will not use cached MAC addresses. Because of the way our HP NIC team is setup, different MACs were being presented and this caused an issue. So far so good.
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We also have HSRP enabled in our environment, which is another reason to disable fastpath:
https://now.netapp.com/Knowledgebase/solutionarea.asp?id=ntapcs4322
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