Hi IST-Melbourne, Option A is the easiest option to go with, the other options don’t provide an additional layer of redundancy, they would just make it harder to troubleshoot later on if there was an issue. 
Hi, I've just racked up four N3048 Switches in preparation for the relocation of our EQL iSCSI SAN/Hosts (the actual relocation is not really relevant to this query). Given the number of ports required and the HA requirements, we've deployed the first two switches as a 'switch' in a stack of 2 with the stacking cables correctly installed.  The second 'switch' is identically cabled as a stack of two units. The stack will give me two 'switches' with 96 ports each - one in rack A and one in rack B.  This gives me the desired capacity and provides for redundancy (power and physical port).  I don't want to create a 4 switch stack as I would have to reboot all 4 during a firmware upgrade etc. Given we can now 'pretend' I have two switches (of 96 ports each), I need to address how to connect the LAG cables.  We're using 10G SFP cables with the rear-mounted dual port SFP cards.   My specific query is on which port on which switch should go to the corresponding other side.  In other words, should I connect the first SFP port on the topmost unit in rack A to the exact same port in rack B,  then continue as second port on topmost switch in rack A to same port in rack B?  [Option 1] [IMAGE] Or, should I be following the same methodology as the stack ports and connect first port topmost in rack A to bottom, last port in rack B so I'm essentially crossing all the switches over?  [Option 2] [IMAGE] Or, third option, Split the connections so first switch, first port goes to same port but lower switch in rack B and same for 2nd port? [Option 3] [IMAGE] Any ideas/experience welcome.  Oh, and if there is a TR on this scenario, I'd love the URL. Cheers.
Suggested 10G cabling for a LAG on 4 N3048 switches where they are stacked in 
pairs