Re: [Xen-users] Physical disks + Software Raid + lvm in domU

[Francesco Polzella <f.polzella@xxxxxxxx>]

Nico Kadel-Garcia wrote:
> OK. There is just no reason to do RAID in a Xen virtualized 
> environment unless you're testing out a driver. Let the Dom0 do all 
> that work, because it's already managing the disk IO anyway. LVM to 
> merge together different partitions or disks, and exporting an LVM 
> partition for the DomU should and does work just fine.
You are right,
I agree that the chosen setup is uncommon and maybe isn't the right way
to do things on xen. The choice was done because of the use of openfiler
as PV guest. Openfiler let's you manage physical disks with sw raid and
lvm, but expects to have physical disks to start from. One solution, as 
you propose, is to export an LVM volume to the DomU, but openfiler 
webmin will then force the user to create another Volume Group ( and 
volumes ) into the exported volume.
Doing sw raid and LVM in the openfiler DomU was an attractive solution 
to reach these objectives:
	- easy to recover disks (can be mounted easily since they are simple sw 
raid members with LVM on top)
        - Use of unmodified openfiler webmin

I am aware that in such case the disk performance may drop, but it 
should  work!
Best Regards

Francesco




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