Devstack, Cinder, Nova versus memcached

Hello:

We all know how Cinder and Nova use memcached to save Keystone tokens (technically, authtoken middleware does it for them). That is expected. However, devstack leaves a config for Cinder that looks like this:

[nova] region_name = RegionOne memcached_servers = localhost:11211

Does anyone remember how that is used? I looked at Cinder and python-novaclient, and neither use memcached for anything there.

Thanks in advance, -- Pete