Re: [Xen-users] LVM & volume groups

[Olivier Le Cam <Olivier.LeCam@xxxxxxxxxxxxxxxxxxxxx>]

Rich Yumul wrote:
> Can anybody tell me if it makes a difference if domU's have separate LVM 
> volume groups? 
>
> For instance, the Xen User Manual ( 
> http://tx.downloads.xensource.com/downloads/docs/user/#SECTION03330000000000000000) 
> says, when setting up a domU's disks with LVM, to do a
> vgcreate vg /dev/sda10
>
> Should each domU have it's own volume group, or can all the domU's share 
> the 'vg' volume group?
It's related to LVM, not to Xen. You can create several logical volumes 
(lvcreate) in a volume group. These volumes will be "shown" as normal 
devices in /dev/vg/.
Each DomU can then be attached to one (or several, depending on the 
number of "disks" your DomU is attached to) logical volume of the same 
volume group:
lcslis-dom0:~# lvscan
  ACTIVE            '/dev/vg1/slis-part1' [8,00 GB] inherit
  ACTIVE            '/dev/vg1/slis-part3' [1,00 GB] inherit
  ACTIVE            '/dev/vg1/slis-swap' [512,00 MB] inherit
  ACTIVE            '/dev/vg1/lcs-part1' [8,00 GB] inherit
  ACTIVE            '/dev/vg1/lcs-swap' [512,00 MB] inherit
  ACTIVE            '/dev/vg1/debian-swap' [512,00 MB] inherit
  ACTIVE            '/dev/vg1/slis-part2' [10,25 GB] inherit
  ACTIVE            '/dev/vg1/lcs-part2' [10,25 GB] inherit
  ACTIVE            '/dev/vg1/lcs-part3' [10,25 GB] inherit
  ACTIVE            '/dev/vg1/debian-part1' [10,25 GB] inherit

I have there 3 DomUs running on: slis, lcs and debian.

HTH

--
Olivier Le Cam
DÃpartement des Technologies de l'Information et de la Communication
CRDP de l'acadÃmie de Versailles

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