Eric H. Johnson on 28 Sep 2013 08:57:32 -0700

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[PLUG] Spanning volumes with LVM (Ubuntu)

Hi all,

I broke down and bought a new computer to use as a Mythtv backend. It came
with a 1TB drive and I added 2x3TB drives. I am now trying to span the 3
drives with LVM by following the instructions here:

I installed the OS (Ubuntu 13.04) to the 1TB drive.

When I did the vgextend for the first 3TB drive it only extended by 2TB. I
saw something along the way that there was a 2TB limit for MSDOS (FAT,etc.)
drives, but should not be a problem for ext2/3/4. I suspect this command may
be the problem when preparing the whole disk for LVM:
dd if=/dev/zero of=/dev/sdb bs=512 count=1

Where I might need a larger block size. Gparted reports the file system of
the 3TB volume as "lvm2 pv".

Any ideas what I need to do to see the entire 3TB, as well as the second 3TB
drive which I have not even started on.


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