NonStop Clusters (NSC) was an add-on package for SCO UnixWare that allowed creation of fault-tolerant single-system image clusters of machines running UnixWare. NSC was one of the first commercially available highly available clustering solutions for commodity hardware.[1]
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Walker, Bruce J.; Steel, Douglas (1999), "Implementing a Full Single System Image UnixWare Cluster: Middleware vs Underware", in Arabnia, Hamid R. (ed.), International conference on parallel and distributed processing techniques and applications, vol. 6, Las Vegas, Nevada, USA: CSREA Press, pp. 2767–2773, ISBN 1-892512-15-7, OCLC 48259379, retrieved 2013-10-18.