[linux-lvm] How to grow LVM and underlying partition?

Yang Zhang yanghatespam at gmail.com
Sun Nov 28 03:58:18 UTC 2010

I was messing around with a VM running Ubuntu 10.04 Server (64-bit)
with LVM on a single 4GB disk. I just used the installer's automatic
LVM setup and I landed with (ignore the disk size - that was after I
resized the disk to be 8GB):

Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004b903

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          32      248832   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              32         523     3942401    5  Extended
Partition 2 does not end on cylinder boundary.
/dev/sda5              32         523     3942400   8e  Linux LVM

Ubuntu also made the LVM house just a root FS and a 512M swap.

At this point, I grew the underlying disk to 8GB using the VM
management software, then booted into the VM and tried to figure out
how to grow my swap and root FS. Reading man pvresize:

Expand the PV on /dev/sda1 after enlarging the partition with fdisk
pvresize /dev/sda1

This made me figure I had to first enlarge the partition with fdisk.
So I tried deleting the extended partition 2 (which also deleted the
logical partition 5 housing LVM), then recreating both partitions but
this time using all cylinders (with the same partition numbers and
also setting the logical partition's type to 8e for Linux LVM). Alas,
that failed - I rebooted at that point, but the VM would no longer
boot. (Sorry I didn't jot down the exact error message(s), but there
was something about the /dev/mapper/testbox-root not being found - I
can retry the whole experiment if this message is critical.)

So is what I'm trying to do possible? What's the right way to go about
it? Thanks in advance.

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