Clustering the IDP using Terracotta?

[Peter Schober]

* David Langenberg <davel at uchicago.edu> [2013-01-24 16:49]:
> We're seeing good results using the Memcache storage plug-in to achieve
> clustering in a terracotta free way.  Maybe give that a shot?

How does using memcache provide "clustering"?
Unless you add a replication/redundancy layer on top of memcache all
you do is move the single point of failure to a shared memcached?
-peter