I have done the install accoring to this howto: http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID - everything went great no errors. i compiled my kernel with genkernel and rebooted, thinking it was a perfect install, i got this error: 

=================
Detected real_root as a md device.
Setting up the device node...
Determining root device...
Mounting root...
mount: Mounting /dev/md3 on /newroot failed: Invalid argument
!! Could not mount specified ROOT, try again
!! The root block device is unspecified or not detected.
Please specify a device to boot, or "shell" for a shell...
================= 

i searched the forums and got to this post:
http://forums.gentoo.org/viewtopic-t-548818-highlight-genkernel+raid.html

so i recompiled my kernel manual way, and still the new server wont boot up, the tech guy forgot to give me the error so i am just checking my steps now,