Grub HD wrong detection mapping [migrated]

Grub HD wrong detection mapping [migrated]

I have a sata disc with several partitions, one with Centos and one with
Clonezilla Live. Grub sees both entries correctly, and starts either OS
correctly.
Then I install my big monster (a bit of sarcasm here) data hardware RAID
(which bios and assumingly grub too, see as one HD), and pop! the grub
does not load either OS. I disconnect the monster, and pop! it all works
again.
The issue here, I think, is that grub does not map the (hd*) to either HD
correctly. I don't know what order criteria there is within the grub HD
detection, but it maps the monster RAID as hd0 instead of the usual sata
disc.
How do I influence the grub hd detection/mapping, so that grub will point
the right hard drive, irrespective of whether the RAID drive is installed
or not?
map (hd0) (hd1) does not solve the problem.