Related technology

Wikipedia: Computer cluster
Wikipedia: Two-node cluster
Comparing Clustering Solutions (OpenSSI would be comparable to NonStop Cluster except OpenSSI supports over 100 nodes.)
OpenSSI has got nothing to do with Microsoft Cluster Services, but we offer much of those features if not more.
OpenSSI's CFS with integrated DLM is analogous to HP TruCluster Software and their Cluster File System.
OpenSSI's DRBD integration is similar to software Volume Shadowing for OpenVMS except currently DRBD-SSI only supports shadowing with two devices per volume.
OpenSSI brings to Linux high-availability clustering and single-system image clustering technologies similar in principle to OpenVMS Cluster software.
OpenSSI's HA-LVS provides much of Ultra Monkey load balancing and high availability solution, but is easier to manage. OpenSSI only requires a single clusterwide XML virtual server configuration and has built-in automatic TCP/IP and UDP/IP real server management and zero config automatic failover.
OpenSSI process load balancing is based on Mosix which is a management system that allows a Linux cluster or a Grid of clusters to perform like a single computer with multiple processors. It is particularly suitable to run intensive computing and applications with moderate amounts of I/O. In a MOSIX based system there is no need to modify or to link applications with any library, or even to assign processes to different nodes - it is all done automatically, just fork and forget, like in an SMP.