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Re: [Xen-users] Convert from image to LVM

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Convert from image to LVM
From: Felix Kuperjans <felix@xxxxxxxxxxxxxxxxxx>
Date: Sat, 26 Jun 2010 22:19:02 +0200
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Well the correct name for XEN's virtual disks is /dev/xvda... /dev/sda can only be used for compatibility AFAIK.

As long as both are paravirtualised, you would have no technical disadvantage.

Am 26.06.2010 22:13, schrieb Jonathan Tripathy:
Using the UUID didn't help. The error changed to can't find /init

This is very strange...

It all works ok if I use sda instead f xvda in the DomU config file. Should I use that? Is there a disadvantage to using sda instead of xvda?


On 26/06/10 21:02, Bruce Edge wrote:
On Ubuntu you'll need to install the parted package 
Just run parted on dom0 and you'll see the embedded partitions show up under /dev/mapper.
eg:

0 kaan-22  ~ #> ls -l /dev/mapper 
total 0

brw-rw---- 1 root disk 251,  4 Jun 25 09:09 system-dpm_0
0 kaan-22  ~ #> partprobe 

0 kaan-22  ~ #> ls -l /dev/mapper
total 0
brw-rw---- 1 root disk 251,  4 Jun 25 09:09 system-dpm_0
brw-rw---- 1 root disk 251, 11 Jun 26 13:01 system-dpm_0p1
brw-rw---- 1 root disk 251, 12 Jun 26 13:01 system-dpm_0p2
brw-rw---- 1 root disk 251, 13 Jun 26 13:01 system-dpm_0p5

You can mount these as regular partitions now.

-Bruce


On Sat, Jun 26, 2010 at 12:09 PM, Jonathan Tripathy <jonnyt@xxxxxxxxxxx> wrote:
How do I use partprobe with LVM?

Thanks


On 26/06/10 20:06, Bruce Edge wrote:
Have you tried using root=UUID=... instead?

Use partprobe to discover the embedded lvm partitions so you can get their UUIDs.

-Bruce


On Sat, Jun 26, 2010 at 11:16 AM, Jonathan Tripathy <jonnyt@xxxxxxxxxxx> wrote:
By changing the config from xvda to sda, it work normal. However I wish to use xvda as I think it's te "standard" for the future..

So clearly there is some setting in my Ubuntu that is still making it look for sda1 instead of hda1. It's as if it's ignoring the "root=" argument in pygrub...

On 26/06/10 19:09, Jonathan Tripathy wrote:
Hi Everyone,

I'm trying to convert my Ubuntu PV Guest from image based disk to LVM. It uses pygrub.

What I did, was I created a new LV and used dd to copy the contents of the image over to the LV. I then changed the domU config file to use phy:/

Now, when I start the DomU, the kernel boots, however it can't seem to mount root properly. It says that /dev/sda1 doesn't exist. What is strange is that in the Dom0, I mounted the LV and changed the root= parameter of the kernel line to point to /dev/hda1, however the previous error still shows

Any ideas?

Thanks
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