When booting with a raid 1 dmraid mirror the dm_mirror module is not loaded so you get an error. Only was to fix it was to build device mapper and dm mirror support directly into the kernel (which it didn't like very much and finally got it to go). This should be loaded if dodmraid is passed. Reproducible: Always Steps to Reproduce: 1. Create raid1 setup with dmraid. 2. Try to boot it. Actual Results: Got error unknown type mirror. Expected Results: Loaded the dm_mirror module from the initramfs.
genkernel 3.3.6 is now in CVS