A virtual server is a highly scalable and highly available server built on a cluster of real servers. The architecture of the cluster is transparent to end users, and the users see only a single virtual server. http://www.LinuxVirtualServer.org/
Root page for High-Availability Linux Project; goal: Provide a high-availability (clustering) solution for Linux which promotes reliability, availability, and serviceability (RAS) through a community development effort. http://linux-ha.org/
MOSIX for Linux is a cluster-enablement technology that provides transparent process migration between nodes in a cluster. Migration is pre-emptive and transaparent to the user; processes run remotely via distributed system calls. http://www.mosix.cs.huji.ac.il/
Drbd is a block device which is designed to build high availability clusters. This is done by mirroring a whole block device via (a dedicated) network. You could see it as a network raid 1. http://www.complang.tuwien.ac.at/reisner/drbd/
They make reliable high availability, data replication and load balancing software solutions including H.A. Clusters, H.A. EchoStream and H.A. Fulcrum. http://www.tech-sol.com
Add CompactPCI hot-swap capabilities to: Linux / Embedded Linux, Solaris, VxWorks, Windows9x, Windows2000, Windows NT, and Windows NT- Embedded. http://www.jungo.com/cpci.html
A basic framework for a high-availability implementation. It exchanges and updates the status of all nodes within the cluster, so that a crash can be immediately noticed and appropriate action be taken. http://www.lemuria.org/Heart/
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