Re: [Xen-users] Using lvm for domUs

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

john maclean wrote:
> Hey chaps. What's the best way to populate an lvm to get it ready for 
> xen?
> Steps I've taken so far;
> * create file based images using another machine.
> * create physical group and volume
> * create logical volume
>
> All checks out so far...
> acid:~# lvscan
>  ACTIVE            '/dev/xenLabs/etch_lvm' [4.00 GB] inherit
>  ACTIVE            '/dev/xenLabs/etch_swap' [128.00 MB] inherit
>  ACTIVE            '/dev/xenLabs/blag_lvm0' [2.00 GB] inherit
>  ACTIVE            '/dev/xenLabs/blag_swap0' [128.00 MB] inherit
>
> So far so good.
> * mount /dev/xenLabs/etch_lvm /mnt/testing
> * mkfs.ext3 /dev/xenLabs/etch_lvm
> * mkswap /dev/xenLabs/etch_swap
> * debootstrap /dev/xenLabs/etch_lvm
>
> OK, still with me? Config file;
> cat /etc/xen/etch_lvm
> #  -*- mode: python; -*-
> kernel = "/boot/vmlinuz-2.6.16-xen"
> memory = 128
> name = "etch_lvm"
> vif = [ '' ]
> disk = [ 'phy:xenLabs/etch_lvm,sda1,w', 'phy:xenLabs/etch_swap,sda2,w']
> dhcp="dhcp"
> hostname= "etch_lvm"
> root = "/dev/sda1 ro"
> extra = "4"
> vnc= 'yes'
>
> xm start etch_lvm => backend device not found. Am I missing something?
> Perhaps I'm not using dd correctly to fill up the lvm. wrong switches
> used for cp perhaps?
>
> tried dd /path/to/image /path/to/lvm
> cp -dpR /path/to/image /path/to/lvm
>
> xen-3.0.4-1
First: unless you have really compelling need, do *NOT* use lvm inside 
of Xen guests. Seriously, you're just adding another layer of management 
and configuration problems you don't need. Keep your LVM work in Dom0.
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