Hi again, sorry for the noise, but I have to correct this. I've now a reason why the installing of grub fails although I don't know why.
The server in question is also running a iscsi initiator (open-iscsi) and these devices are shown as sdc, sdd, .. It seems this confuses grub-install. Booted from cd in rescue mode, open-iscsi isn't running and all works fine. I've now discovered that stopping open-iscsi before executing "grub-install /dev/md0" in the normally booted systems works correctly. I'm able to reboot afterwards normally. -- greetings eMHa
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