This morning I rebooted my Debian-server.
After a while Grub responded during te boot-process with: Error 15 file
not found.
To my surprise the whole boot directory appears to be empty, except for
the /boot/grub directory.
The server is a HP Proliant 360 with a smartarray controller.
What I probably need to do is to reinstall a kernel image.
I can boot with a Debian-installer CD, but I don’t know how to manually
mount what was /dev/cciss/c0d0p1.
After running the hardware detection I do have a /dev/cciss/disc0/par1