Extend a VM disk using fdisk

gistfile1.txt

Extend the disk using fdisk (after the disk image itself has been extended):

fdisk -u /dev/sda
- Use the option p to print the partition table (you will need the start position later)
- Delete the partition with option d
- Add a new partition with option n
- Create a primary partition with P and give this the partition number 1
- For the first sector, use the start position from step 2
- Use the defaultvalue for the last sector
- Check your changes by printing the partition table again
- Write the table to the disk with option w and reboot when asked

Extend the physical volume. Eg: pvresize /dev/sda5
Use pvdisplay to check how much free space you can assign to the logical volume
Eg: Free PE 320

By using lvextend, you can add the Free PE to the logical volume (with lvdisplay you can find the correct logical volume name)
Eg: lvextend –l +1281 /dev/mapper/data-data

Finally (only for extX file systems): resize2fs /dev/mapper/data-data