1) linux rescue
2) skip mounting and go to command prompt
3) Run the following command to activate the LVM partition
lvm vgchange -a y
5)You should be able to address the activated LVMs. If you have trouble with their naming, run:
lvm lvscan
6) check the partition
fdisk -l
7) Check and repair each logical volume’s filesystem by running something like this:
fsck -f /dev/VolGroup00/LogVol00
reboot you system