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Re: [Xen-users] LVM & volume groups

from [Ulrich Windl]

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Subject:	Re: [Xen-users] LVM & volume groups
From:	"Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>
Date:	Thu, 07 Dec 2006 09:13:39 +0100
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On 6 Dec 2006 at 14:27, 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?

Hi!

My little experience on performance indicates that booting two or more DomUs 
(SLES10) in parallel drives a two disk RAID1 to its limits with different LVs 
on 
the RAID. So if you have more disks, I'd suggest to distribute DomUs there. 
Partitions, VGs, and LVs are just a higher level of managing storage space.

Regards,
Ulrich

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