Hello,   No, do not use the 10GbE uplink ports.  Those are designed for switch to switch, they lack buffers to handle the 10GbE to GbE.   You'd end up with unstable connections and reduced performance.  Plug the 6210 into the GbE ports instead.  Those  PS6000s must be nearing its end of their warranty?   You can't mix arrays with support and ones w/o in the same group.    Regards,  Don  
I am posting this in a few places in hopes of a quick and knowledgeable response. We have 4 EqualLogic PS6000, all 1Gb. We are bringing in our first PS6210 10Gb. The issue is we have Cisco Nexus 3K and only have 10Gb uplink ports.   So should we plug the new PS6210 in to the uplink ports at 10Gb or plug them in to the 1Gb standard ports?   The info we have found seems to say no but it seems a waste to not use those ports if we can.
EqualLogic 10Gb