Single System Instance Linux:

"The SSI project leverages both Compaq's NonStop Clusters for Unixware technology and other open source technology to provide a full, highly available SSI environment for Linux. Goals for SSI Clusters include availability, scalability and manageability, built from standard servers. Technology pieces will include: membership, single root and single init, cluster filesystems and DLM, single process space and process migration, load leveling, single and shared IPC space, device space and networking space, and single management space. The SSI project leverages the Cluster Infrastructure (CI) for Linux project."

ssic-linux.sourceforge.net
www.opensource.compaq.com