The new version FAI 4.2.2 fixes another LVM issues and can now install CentOS 7 using the simple examples of the config space.
The ssh daemon can now be started earlier, if you specify the FAI_FLAGS on the kernel command line. The new packages are available from the FAI project package repository, after you've added this line to sources.list: deb http://fai-project.org/download wheezy koeln -- regards Thomas