I've not had much luck with my Google-fu on this, but I'm wondering if the integrated iSER support in 6.7 is adapter agnostic. I already have some systems with x540 and x550 Intel dual 10G NICs and my QNAP iSCSI hosts support iSER so I was thinking this might be a nice performance tweak with no new hardware if it's at all possible.
I havent ventured in this, but as per my understanding, the requirement for using ISER are
you need to use Iser Capable Network card
and instead of iscsi adaptor iser rdma adapter, and yes these adaptor has to be added to local.sh in rc.local
this guy was able to test it successfully on 6.5 u1 and mallanox connectx-4 port network card
This is all from Google
thought this may help