[linux-lvm] LVM2 and OCFS2

[Patrick Caulfield]

Boris Ostrovsky wrote:
> (Resending with cc: fixed)
> 
>> It's true that lvm is not cluster-aware. What that means is that if
>> you update the
>> volume groups on one node then the other nodes in the cluster will not
>> see the
>> changes and you could end up with the block devices on the machines
>> dangerously
>> out of sync.
> 
> What if I can guarantee that other nodes will not access LVM metadata
> (i.e. they will not issue any LVM command) until I run 'vgchange -ay'
> on them? The only access that those other nodes will have to volumes
> is that they will have some of them mounted.
> 
> Is this still dangerous? My (limited) understanding of metadata is
> that it is stored in the first few blocks of a disk (or striped, if
> necessary) and is cached in lvm.cache. vgchange will sync disk and
> cache, so it should be OK, right?

Yes, that should work.

Just be VERY, VERY careful!

patrick