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Grub endommagé !

05/09/2015, 12h00
Mon serveur ne reboot plus.
le support technique pour réponde qu'il faut réparer le grub, donc j'ai essayer de me connecter au mode rescue. Malheureusement je ne peux pas monter la répartition principale: sda2

root@rescue:/# parted -l
Model: LSI Logical Volume (scsi)
Disk /dev/sda: 1999GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 20.5kB 1049kB 1029kB primary bios_grub
2 2097kB 52.4GB 52.4GB ext2 primary
3 52.4GB 1788GB 1736GB ext4 primary
4 1788GB 1789GB 1073MB linux-swap(v1) primary
5 1789GB 1999GB 210GB primary

root@rescue:/# mount /dev/sda1 /mnt/
mount: block device /dev/sda1 is write-protected, mounting read-only
NTFS signature is missing.
Failed to mount '/dev/sda1': Invalid argument
The device '/dev/sda1' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
root@rescue:/# mount /dev/sda2 /mnt/
mount: wrong fs type, bad option, bad superblock on /dev/sda2,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

root@rescue:/# dmesg | tail
EXT2-fs (sda1): error: can't find an ext2 filesystem on dev sda1.
EXT4-fs (sda1): VFS: Can't find ext4 filesystem
cramfs: wrong magic
FAT-fs (sda1): bogus number of reserved sectors
FAT-fs (sda1): Can't find a valid FAT filesystem
FAT-fs (sda1): bogus number of reserved sectors
FAT-fs (sda1): Can't find a valid FAT filesystem
ISOFS: Unable to identify CD-ROM format.
EXT4-fs (sda2): ext4_check_descriptors: Block bitmap for group 0 not in group (block 2553887680)!
EXT4-fs (sda2): group descriptors corrupted!

merci pour votre aide !