Hope I'm not spamming the devs here, but I've got what really feels like a bug with the installer here.
I've got a new SuperMicro X10-DRI motherboard with a 3Ware 9750 raid card that hangs during installation of 7.1. If I pull the card, the installer proceeds normally. CentOS 6.6 installs without error on this hardware so I know the hardware is working.
I've documented this here:
https://www.centos.org/forums/viewtopic.php?f=49&t=52231
If there is more information I can provide, please let me know.
Kirk Bocek