MULTIPROCESSOR CLUSTER
MEMBERSHIP MANAGER FRAMEWORK
 Inventors: Robert A. Alfieri, Apex; James T.
Compton, Durham, both of N.C.;
Andrew R. Huber, Monroeville, Pa.;
Paul T. McGrath, Raleigh, N.C.;
Khaled S. Soufi, Durham, N.C.; Brian
J. Thorstad, Cary, N.C.; Eric R. Vook,
Chapel Hill, N.C.
 Assignee: Data General Corporation, Westboro, Mass.
 Appl. No.: 493,550
 Filed: Jun. 23,1995
 Int CI.6 G06F 15/16
 U.S. CI 395/200.47; 395/200.53;
 Field of Search 395/200.01,200.02,
395/200.03, 200.04, 200.05, 200.06, 200.08, 200.1, 200.12, 650; 364/131, 132, 133, 134, 942.3, 942.4, 942.5, 942.51, 942.6
 References Cited
U.S. PATENT DOCUMENTS
4,849,877 7/1989 Bishop et al 364/200
4,980,857 12/1990 Walter etal 364/900
A shared-disk cluster system includes a cluster membership manager framework which coordinates the joining or leaving among all nodes in a cluster including taking the multiple layers of involved subsystems through transitions. Subsystems are notified of transitions in particular order depending upon the transition, and all nodes' subsystems receiving a notification must process that notification prior to another layer of subsystems being notified. One of the subsystems registered for notification is an event manager in user space. The event manager carries out transfers of client services, including user applications, resulting from nodes joining and leaving the cluster. This includes a registration and launch service which registers a node, or multiple nodes, in a cluster which claims, or is assigned, responsibility for the service and provides an optional launching function which initiates the client service upon successful registration.
44 Claims, 23 Drawing Sheets