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This one is interesting, however you can have the FEX with one Fan direction and the N5K with another direction, other than reseatting the PS and the FAN there should not be any issue with the parts you have now
Hello Hans, Please see this link http://www.cisco.com/c/en/us/td/docs/switches/datacenter/hw/nexus7000/installation/guide/n7k_hig_book/n7k_replacing.html#wp1410535 You will need to copy licenses to the new Sup HTH Yamil