I have a similar problem with HP DL380 servers with a RAID controller
that uses the "cciss" driver. Disks show up under /dev/cciss like:
/dev/cciss/c0d0p6 on / type ext3 (rw,errors=remount-ro)
And since grub no longer understands that, grub-mkdevicemap leaves me
with an empty device.map and I get
grub-probe: error: Cannot find a GRUB drive for /dev/cciss/c0d0p6. Check
your device.map.
from update-grub.
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