[Ocfs2-users] Query regarding OCFS2 and RHEL4 LVM

[Ionel GARDAIS]

Hi Joel,

As CLVM is to be configured along with the cluster-suite and you stated 
"[...] that [CLVM] uses a different cluster technology than ocfs2 does, 
and as such the two cluster stacks may conflict when a node goes down."
What are the common solutions to this problem ?

Thanks,
Ionel



Joel Becker wrote:
> On Tue, Jul 08, 2008 at 05:36:48PM +0100, Pedro Figueira wrote:
>   
>> Why do you consider the LVM2 not cluster safe? Is it just because you should not (can't) modify any LVM configuration with the volume groups activated in more than one server?
>>     
>
> 	Not only can you not modify it, there are also configurations
> where the LVM2 code will do modifications behind your back - and the
> other nodes don't know about it.  For example, dm-mirror keeps track of
> changes that have only hit one copy so far.  Another node might read the
> un-updated copy before it has been updated by the writing node.  That's
> not safe.
> 	We consider data integrity of paramount importance.  Trying to
> configure LVM2 (non-clustered) to make sure nothing will change is not
> trivial.  We won't recommend it, knowing that it just takes one admin
> who isn't paying attention to wipe out your entire volume.
>
> Joel
>
>   

-- 
Ionel GARDAIS
System-Network Engineer

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