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

[hubert chomette]

ok
thank's for the information
I'll try.

regards,

Le 28 sept. 07 à 09:12, David Robinson a écrit :

> hubert chomette wrote:
>> 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.
>
> So its a high-availability cluster...
>
>>>> - Is it possible to allow LVM metadata modification by only one  
>>>> server?
>>>> - should I use clvm instead?
>
> The link below describes what can happen.
>
> http://www.tldp.org/HOWTO/LVM-HOWTO/sharinglvm1.html
>
> It sounds like you should be using CLVM. CLVM extends LVM2 to  
> provide cluster-wide management of Logical Volumes. LVM and CLVM  
> are essentially the same thing, but CLVM is cluster aware, LVM is not.
>
> Alasdair has some presentations which describe CLVM in detail here:
>
> http://people.redhat.com/agk/talks/CLVM-UKUUG2007/
>
>>>> - Is it possible to migrate lvm to clvm without any data lost?
>
> There's no migration involved, you just need to enable cluster  
> locking for the shared volume group.
>
> eg: vgchange -c y VolumeGroupName
>
> --Dave
>
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