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

[Ray Morris]

use fdisk -u to be sure the new, larger partition starts
with the exact same sector as the old, smaller one.
--
Ray Morris
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On 11/27/2010 09:58:18 PM, Yang Zhang wrote:
> 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:
> 
> <<<
> ...
> EXAMPLES
> 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.
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 
>