So it's the partion 2, in Linux accessable as /dev/sda2,
but under lvm control, so you should try to repair it from a resuce system with lvm.
Stop the boot process with a few key strokes, so you get a grub menu that offers a rescue system.

If there is none, you can try to edit the normal linux system, and add rd.break to the kernel parameters, then continue the boot. It then spawns a rescue shell.

In the rescue system or in the rescue shell you must try to access the disk
The lsblk command should list a tree.
You can try to mount a part of it, probably /dev/mapper/VolGroup-lv_root,
(create an empty directory for example with mkdir -p /mnt)
so the command is

Code:

mount /dev/mapper/VolGroup-lv_root /mnt

If the mount fails with "bad superblock", then run fsck on it.

Pardon if my knowledge is rather theoretical.