I'm also tried adjust sweep time in my SM configuration.
But getting the link-up delay was exist.
There is not a link-up delay that I was change the switch to DDR switch with SM.
(I have some hybrid cables and DDR Switchs, too)
vSphere driver loading and immediatly logical link-up established on DDR switch environments.
Is there any user or admins on vSphere environments with above QDR switches?