/ on LVM and rescue

[der.hans]

moin moin,

RedHat defaults to putting root on an LVM. It generally boots and works
fine.

For the times where it doesn't boot correctly, I'm trying to learn how to
rescue the system.

I'm trying to use System Rescue CD to boot the currently installed system.
It's not working.

Grub lists root as /dev/VolGroup00/LogVol00, but specifying that ( and
several other variations ) doesn't work.

What's the magic goo needed to get grub to boot and use a root partition
on LVM?

ciao,

der.hans
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