Hi All

I have Ubuntu 12.4 server running on proxmox. I have increased the size of the hard drive in proxmox but now need to expand the free space on ubuntu.

Can anyone give me instruction on how to do this in the command line please. Ubuntu is using the default lvm with 3 partitions

Thanks

Glenn

hi glen,
Here's the list of steps for a simple scenario where you have two partitions, /dev/sda1 is an ext4 partition the OS is booted from and /dev/sdb2 is swap. For this exercise we want to remove the swap partition an extend /dev/sda1 to the whole disk.

As always, make sure you have a backup of your data - since we're going to modify the partition table there's a chance to lose all your data if you make a typo, for example.

Run sudo fdisk /dev/sda

use p to list the partitions. Make note of the start cylinder of /dev/sda1
use d to delete first the swap partition (2) and then the /dev/sda1 partition. This is very scary but is actually harmless as the data is not written to the disk until you write the changes to the disk.
use n to create a new primary partition. Make sure its start cylinder is exactly the same as the old /dev/sda1 used to have. For the end cylinder agree with the default choice, which is to make the partition to span the whole disk.
use a to toggle the bootable flag on the new /dev/sda1
review your changes, make a deep breath and use w to write the new partition table to disk. You'll get a message telling that the kernel couldn't re-read the partition table because the device is busy, but that's ok.
Reboot with sudo reboot. When the system boots, you'll have a smaller filesystem living inside a larger partition.

The next magic command is resize2fs. Run sudo resize2fs /dev/sda1 - this form will default to making the filesystem to take all available space on the partition.

That's it, we've just resized a partition on which Ubuntu is installed, without booting from an external drive.

Not without hard data on your current setup. Disk(s), Partition(s), pvs, vgs, lvs, fstab, ...
Get the picture ?. We're running blind, and you ain't helping.