The Lewis3 upgrade went into production on July 1, 2015, and the first phase of the old hardware that was no longer viable has been decommissioned and removed from the legacy cluster. The remaining nodes will continue to be retired or migrated to the Lewis3 cluster, starting with the nodes that replaced the Clark cluster. The entire legacy cluster will be decommissioned sometime after July 1, 2016, and we will now provide only limited support for this environment to allow us to focus on growing the Lewis3 system. On July 31, 2016, any account that has not been migrated to Lewis3 will be closed and all data permanently removed from the cluster.
— Aug. 4, 2015