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Michael Sage

IT, Digital & Culture

Extend a partition and LVM with Ubuntu 16.04

There is a risk of data loss doing this!!!

First add the additional disk space using your virtualisation admin software (i.e. ESXi / Proxmox / etc)

Rescan the bus

echo 1 > /sys/class/block/sda/device/rescan

Next start fdisk

sudo fdisk /dev/sda

Press p to print the current partition list. Copy the start block for both sda2 and sda5. Now we need to delete the partitions.

Press d to delete the partion accept the default of ‘2’
Press d again and accept the default of ‘5’

Now press n for a new partition

Create an extended partition, make sure the start block is that of your “old” sda2 partition.

Accept the other defaults to use all available space.

Now press n again

This time accept the defaults. The start block will be wrong, but this is ok and a slight anomaly with this method.

This bit is super, world ending, important.

Once you are back to the fdisk prompt press x (to enter expert mode)

Press b and make sure sda5 is selected.

Enter the start value that you copied earlier for sda5.

Once you are back at the expert command prompt, press r (to return to the main menu) and then w (to write the changes and exit.

We’ve now finished with fdisk.

Now sync the changes with the running OS.


Extending LVM


pvresize /dev/sda5
lvextend -l +100%FREE /dev/VGNAME/LVNAME
resize2fs /dev/VGNAME/LVNAME

If you don’t know your VGNAME or LVNAME run


That’s all there is to it!