[Linux-cluster] Converting from dlm to lock_nolock?

[Ray Van Dolson]

I am in the process of migrating a lot of data off of a 2-node GFS2
cluster (RHEL5) via rsync.  There isn't a lot of data (only about
500GB), but there are a *lot* of files (about 5.4 million inodes).  As
such, secondary rsync runs still take a lot of time walking the GFS2
file system tree looking for differences.

I'm exploring some options for speeding that up -- the main one being
dropping my cluster to only one node.  Is this doable for a file system
that was greated with the dlm lock manager instead of lock_nolock?

Perhaps simply failing one node out of the cluster would be sufficient?
I imagine some cluster.conf changes might be necessary?

I am less concerned about maintaining resiliency in the cluster than I
am in reducing the downtime when I shut the current live server off, do
a final rsync and bring the new service online.

Thanks,
Ray