The Nimble KB doc says to vPC peer the Nexus but when working recently with a Nimble SE he recommended not to vPC peer the Nexus in order to avoid iSCSI traffic crossing the peer link.
The scenario would be as follows:
dual iSCSI subnets/VLANs (best practice according to Nimble SE). One for FI-A and one for FI-B
both of those VLANs of course would reside on both Nexus due to vPC requirements.
Nimble, TG-1 (iSCSI-A) conencted to Nexus 1, TG-2 (iSCSI-B) connected to Nexus 2 (not vPCd)
FI's vPC'd to each Nexus
In my picture below, the yellow lines represent iSCSI-A traffic coming from FI-A. Any thoughts?