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hernad@nmraka-1:~$ sudo resize2fs -p /dev/mraka3vg1/root_3 6G

resize2fs 1.40.8 (13-Mar-2008)
Please run 'e2fsck -f /dev/mraka3vg1/root_3' first.

hernad@nmraka-1:~$ sudo e2fsck -f /dev/mraka3vg1/root_3

e2fsck 1.40.8 (13-Mar-2008)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mraka3vg1/root_3: 119177/655360 files (0.9% non-contiguous), 725855/2621440 blocks
hernad@nmraka-1:~$ sudo resize2fs -p /dev/mraka3vg1/root_3 6G
resize2fs 1.40.8 (13-Mar-2008)
Resizing the filesystem on /dev/mraka3vg1/root_3 to 1572864 (4k) blocks.
Begin pass 2 (max = 22626)
Relocating blocks             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 80)
Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 4 (max = 13397)
Updating inode references     XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXThe filesystem on /dev/mraka3vg1/root_3 is now 1572864 blocks long.

hernad@nmraka-1:~$ sudo lvresize -L6G /dev/mraka3vg1/root_3

  WARNING: Reducing active logical volume to 6,00 GB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce root_3? [y/n]: y
  Reducing logical volume root_3 to 6,00 GB
  Logical volume root_3 successfully resized