Re: [Xen-users] Sharing space on a SAN?

[John Madden <jmadden@xxxxxxxxxxx>]

> > > Degradation is inherent to the concept of shared storage. Either
> you trust the
> > 
> > in this case the degradation isn't because the storage is shared;
> it's
> > because of the sync mechanisms to avoid stepping on the other
> > machine's toes.  And there's a world of difference between locking
> to
> > access the volume partition (CLVM/EVMS-ha) and locking at file level
> > (GFS/OCFS).
> Point taken. However, during live migration you still need two
> machines to be able to access the same volume at the same time. If
> this were possible, it would be an additional step you needed to do
> before migration - thus adding one more error you could make.

CLVM doesn't prevent two hosts from accessing the same LV at the same
time, it just ensures that changes to the VG's are coherent across the
cluster (its locking is limited to configuration-related activities).
Migration shouldn't be an issue here.  

John



-- 
John Madden
Sr. UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx


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