"This tutorial describes how to rescue data from a single hard
disk that was part of a LVM2 RAID1 setup like it is created by e.g
the Fedora Core installer. Why is it so problematic to recover the
data? Every single hard disk that formerly was a part of a LVM
RAID1 setup contains all data that was stored in the RAID, but the
hard disk cannot simply be mounted. First, a RAID setup must be
configured for the partition(s) and then LVM must be set up to use
this (these) RAID partition(s) before you will be able to mount it.
I will use the Knoppix Linux LiveCD to do the data recovery..."