I need help on resize two LVM partitions as I'm afraid of loosing data.

I'm using Ubuntu Server 12.04 headless mode.

LVS:

root@server:/# lvs

  LV      VG   Attr   LSize   Origin Snap%  Move Log Copy%  Convert

  home    LVG  -wi-ao  27,94g

  root    LVG  -wi-ao   6,52g

  storage LVG  -wi-ao 504,84g

  swap    LVG  -wi-ao 732,00m

FDISK:

root@server:/# fdisk -l



Disk /dev/sda: 80.0 GB, 80026361856 bytes

255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00067ea1



   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048      585727      291840   83  Linux

/dev/sda2          587774   156301311    77856769    5  Extended

/dev/sda5          587776   156301311    77856768   8e  Linux LVM



Disk /dev/sdb: 500.1 GB, 500107862016 bytes

255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0008c066



   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1            2048   976771071   488384512   8e  Linux LVM



Disk /dev/mapper/LVG-root: 6996 MB, 6996099072 bytes

255 heads, 63 sectors/track, 850 cylinders, total 13664256 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



Disk /dev/mapper/LVG-root doesn't contain a valid partition table



Disk /dev/mapper/LVG-swap: 767 MB, 767557632 bytes

255 heads, 63 sectors/track, 93 cylinders, total 1499136 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



Disk /dev/mapper/LVG-swap doesn't contain a valid partition table



Disk /dev/mapper/LVG-home: 30.0 GB, 29997662208 bytes

255 heads, 63 sectors/track, 3647 cylinders, total 58589184 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



Disk /dev/mapper/LVG-home doesn't contain a valid partition table



Disk /dev/mapper/LVG-storage: 542.1 GB, 542063460352 bytes

255 heads, 63 sectors/track, 65902 cylinders, total 1058717696 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



Disk /dev/mapper/LVG-storage doesn't contain a valid partition table

I want to shrink my /home LV partition and extent my /storage LV partition.

What is the proper method to do this?

Thanks