Xen users - Nov 2007 - lvm over nbd?

I have a system with a large LVM VG partition.
I was wondering if there is a way i could share the partition
using nbd and have the nbd-client have access the LVM
as if it was local.

SYSTEM A: /dev/sda3 is a LVM partition and is assigned to
VG volgroup1.  I want to share /dev/sda3 via nbd-server

SYSTEM B: receives A''s /dev/sda3 as /dev/nbd0.  I want to
access it as VG volgroup1.

I am hoping this will allow me to share LV partitions on volgroup1
which is used by XEN domUs.

I think i read something about CLVM.  Will this allow me to do what
I want?  how do i go about setting up a clvm?

TIA,
Tomoki

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Poke around cluster computing sites.  I know they do this a lot.  I
typed in ''gndb'' and ''lvm'' to google and got:

http://www.gridvm.org/drbd-lvm-gnbd-and-xen-for-free-and-reliable-san.html

Which looks pretty relevant at first glance...

-Dylan
> I have a system with a large LVM VG partition.
> I was wondering if there is a way i could share the partition
> using nbd and have the nbd-client have access the LVM
> as if it was local.
> 
> SYSTEM A: /dev/sda3 is a LVM partition and is assigned to
> VG volgroup1.  I want to share /dev/sda3 via nbd-server
> 
> SYSTEM B: receives A''s /dev/sda3 as /dev/nbd0.  I want to
> access it as VG volgroup1.
> 
> I am hoping this will allow me to share LV partitions on volgroup1
> which is used by XEN domUs.
> 
> I think i read something about CLVM.  Will this allow me to do what
> I want?  how do i go about setting up a clvm?
> 
> TIA,
> Tomoki
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
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On Tue, Nov 13, 2007 at 09:27:59AM +0900, Tomoki Taniguchi
wrote:
> I have a system with a large LVM VG partition.
> I was wondering if there is a way i could share the partition
> using nbd and have the nbd-client have access the LVM
> as if it was local.
> 
> SYSTEM A: /dev/sda3 is a LVM partition and is assigned to
> VG volgroup1.  I want to share /dev/sda3 via nbd-server
> 
> SYSTEM B: receives A''s /dev/sda3 as /dev/nbd0.  I want to
> access it as VG volgroup1.
For just one client accessing the lvm that should work for plain 
lvm/lvm2, maybe you have to tell lvm it has to search at /dev/nbd0
vor lvm/pv-data.
> I think i read something about CLVM.  Will this allow me to do what
> I want?  how do i go about setting up a clvm?
For accessing the vg with more than one client clvm or evms with
appropriate cluster-aware config is needed.


Christian

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