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

[hubert chomette]

the two machine use the same lun, on this lun, there is one vg with a  
logical volume by virtual machine (10 virtual machine).
The idea is if one xen is down, the other can launch the virtual  
machine ad continu service.

Le 27 sept. 07 à 19:36, Chris Cox a écrit :

> 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
>
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