I'm writting a paper about clusters, so...
What books or articles have a good theoretical material about clusters?
For the ones that may show interest in this paper, it is related to a project I'm working on called L2LB, online @ http://l2lb.googlecode.com/
I don't know too much about cluster computing, but a good resource for browsing CS papers would be here: http://www.pdf-search-engine.com/cluster-computing-pdf.html
See the Wikipedia article VMScluster and the original ACM paper, "VAXcluster: a closely-coupled distributed system".
As the Wikipedia article says:
VAXclustering was the first clustering system to achieve commercial success, and was a major selling point for VAX systems.
The original article discusses the use of a distributed lock manager to maintain integrity in a cluster, and I believe it also talks about quorum algorithms to deal with loss of connectivity between cluster nodes.