To preface, this is my first experience with 10GbE networking and I have encountered an issue which my research does not seem to locate a solution for...
I have two servers (older DL580G5 and DL380G5), each with a HP NC522SFP, 10GbE dual sfp+ port adapter. I have purchased copper "passive" direct connect adapter cables (that look like twinax), which seem to work well when I connect them to the sfp+ ports on my Dell 5524 switch. However, if I directly connect the two servers with the same cable, the link doesn't come up. I am running Window Server 2012 Standard on each server. My intention is to use one of these servers as a homebrew SAN and I would like to enable multiple 10GbE paths for iSCSI traffic.
Can I connect the two adapters to each other, such as I would with previous, less speedy generations of Ethernet?
If I can, do I require a crossover cable, or is there some type of other sfp+ cable solution to do this? My 10GbE sfp+ switch ports are premium, but server-to-server connections are doable in small numbers for me, and I would really like the multiple paths this would give me.
Is there a simple solution to this issue?