Issue while restoring the grub in MBR

chandank · #1 11th May 2012, 12:09 AM

I have setup dual boot in my laptop windows and F16. Mistakenly I uninstalled grub2 rpm from my f16 machine. And when I restarted the machine I could only see the grub prompt.

I tried installaing grub using one Centos 6 live CD but nothing seems to work. I googled a lot but I think something is missing and messing up that I am able to fix my system.

When I tried to install Centos by chosing the option of replacing existing linux, it failed to install and generated a dump log.

Please find below my system layout/information

Code:

[root@livecd ~]# lvdisplay 
  --- Logical volume ---
  LV Name                /dev/vg_chandanklt/lv_swap
  VG Name                vg_chandanklt
  LV UUID                kJF1aO-9PLg-3ntu-qgRb-jMda-vHWk-6iVpnV
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                9.69 GiB
  Current LE             310
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2
   
  --- Logical volume ---
  LV Name                /dev/vg_chandanklt/lv_home
  VG Name                vg_chandanklt
  LV UUID                y0p80v-Xdfi-jKDe-Fm5Y-ARf0-IhAA-T7Xt53
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                151.09 GiB
  Current LE             4835
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3
   
  --- Logical volume ---
  LV Name                /dev/vg_chandanklt/lv_root
  VG Name                vg_chandanklt
  LV UUID                NexdHD-uPRC-hk8B-TY4v-GpkP-zSuv-c0R8yi
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                50.00 GiB
  Current LE             1600
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:4
   
[root@livecd ~]# 

   
[root@livecd ~]# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xaefad785

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         192     1536000    7  HPFS/NTFS
Partition 1 does not end on cylinder boundary.
/dev/sda2             192       31181   248924160    7  HPFS/NTFS
/dev/sda3           58762       60802    16384000    7  HPFS/NTFS
/dev/sda4           31181       58762   221540352    5  Extended
/dev/sda5           31182       31245      512000   83  Linux
/dev/sda6           31245       58762   221026304   8e  Linux LVM

Partition table entries are not in disk order

Disk /dev/mapper/live-rw: 4294 MB, 4294967296 bytes

so far I have tried mounting my root file system sda6(LVM) and doing to /mnt/root

grub-install --root-directory=/mnt/root /dev/sda