Red Hat Knowledgebase

First, boot into rescue mode by using the correct media. This is very important: When prompted to mounted the drives, do not. Using fsck on a mounted filesystem will destroy all the data on that file system. This is unrecoverable. The data will be gone forever--save for very expensive hardware-level data recovery.

The next step is to get into the lvm shell by typing the command lvm.

From inside this shell, run the following set of commands:

# pvscan
# vgscan
# lvscan
# vgchange -ay
# exit

As these are running, check to make sure that no errors are reported.

After exiting the lvm shell, run e2fsck on the LVM volume (in this example, the volume is /dev/VolGroup00/LogVol01):

# e2fsck -f /dev/VolGroup00/LogVol01