[CentOS] raid1 custom initrd and yum

OK sorry to hammer the list but one more question - having almost got the 
drives mirrored and happy - since I have created a custom initrd that has the 
raid1 drivers in it, do I now have to tell yum to ignore kernel updates? Will 
the stock kernel render me unbootable?

Actually I am not 100% sure the initrd I created 

# mkinitrd -f --preload=raid1 /mnt/tmp/initrd-`uname -r`.img `uname -r`

is even being used, because lsmod still lists a raid1 module. Wouldn't it 
be "embedded" in the running kernel and thus not in the module list?

either way I am a little confused and this is important ;)

best regards and thanks to all for the help,
Sam