Patent ID: 9020897
Filing Date: 2015-04-28
Classification: G06F,H04L,Y10S

Abstract:
1. A method for recovering a viable quorum cluster of computers, the method comprising: detecting a failed node in an initial viable quorum cluster by at least one node in the viable cluster when a member of the viable quorum cluster fails; disabling message channels by the at least one node between the at least one node and the failed node after detecting the failed node; disconnecting membership in the viable quorum cluster by the at least one node after disabling message channels after detecting the failed node; blocking new nodes from joining the membership of the viable quorum cluster after detecting the failed node; sending a withdrawal request from one node in the viable cluster to other nodes in the viable cluster when one node intends to deactivate from the viable quorum cluster in an orderly fashion; electing a recovery leader; initializing the recovery process; initiating message interrupts; initiating create locks; preventing new accesses to objects associated with the recovery; returning client tokens held; purging states associated with a client; thawing the message channels; and releasing the create locks.