Re: [Xen-users] LVM & volume groups

[Rich Yumul <rmy@xxxxxxxxxxxxx>]

Thanks for your reply - What I really want to know is that if each virtual machine should be on it's own volume group, or if it's ok if all the domU's share the same volume group?  Or does it even make a difference?

Thanks!

Rich

On Thu, 2006-12-07 at 00:56 +0100, Olivier Le Cam wrote:
> 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

______________________________________
Richard Yumul
rmy@xxxxxxxxxxxxx
http://www.sdtechnix.com

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