Re: [linux-lvm] lvm on a share environnement (SAN inside)

[Chris Cox <chris_cox stercomm com>]

hubert chomette wrote:
> Hi,
> I recently install a SAN at my work. One lun is used for XEN and can be
> used by two xen server.
> For more flexibility I use lvm on this lun. I was very happy of the
> result, unless I discover (during a conversation with a friend) that lvm
> metadata can be compromised if the two server simulty modify metadata.
> - So what can I do?

Use seperate LUNs.  I'm not sure what your friend is talking about.
Unless you have two machines using the same LUN, in which case
there are issues... this would be a cluster filesystem issue, or
near-high availability issue...

> - Is it possible to allow LVM metadata modification by only one server?
> - should I use clvm instead?

Metadata won't creep outside of what is visible.

> - Is it possible to migrate lvm to clvm without any data lost?

Not sure.

> 
> thank's for your help
> 
> regards,
> 
> ps: sorry for my poor english
> 
> 
> 
> 
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> 


-- 
Chris Cox
Sr. Unix Sys Admin