I know for certain we have "non-Dell" SFP+ twinax (I even think some of the exact ones you linked to from fs.com) deployed in our environment which consists of PS6210 arrays and N4032F switches, and there are no problems.  I believe you would be more likely to hit issues if you tried to use non-approved optical transceivers in the array.  I have used a number of different vendors SFP+ twinax cables in our arrays and switches over the years, and have not once had an incompatibility.
Are these cables compatible/supported for 10GB iSCSI connectivity between the PS6210X and Dell N4032F switches?I've already purchased the array and two N4032F switches.  I wanted the non-F model of the N4032 switches and was going to use 10GBASE-T all the way through but the fiber models got ordered inadvertently and the restocking fee makes exchanging them infeasible.I have three PowerEdge R630 servers that I am ordering fiber NICs for (info on that below).  I have already confirmed the twinax cables can be used for connectivity from the servers to the N4032F switches but am having a hard time getting confirmation on using the same cables from the PS6210x to those switches.  Can anyone confirm whether they will work prior to me ordering them?  These are the cables I am asking about:Dell Force10 CBL-10GSFP-DAC-1.5M Compatible 10G SFP+ Passive Direct Attach Copper Twinax Cable[URL] case it is relevant, these are the fiber NICs I am ordering for the R630 servers:QLogic 57810 Dual Port 10Gb Direct Attach/SFP+ Low Profile Network Adapter[URL]
Dell SFP+ 10GbE Copper Twinax Cabling for PS6210x Array