Patent ID: 7231461
Filing Date: 2007-06-12
Classification: H04L

Abstract:
1. A method for rejoining a member to a primary-backup group in a clustered computer system, wherein the primary-backup group is of the type including a primary and at least one backup member, each of which including a copy of replicated group state data for the primary-backup group, the method comprising: (a) determining whether the rejoining member is the primary member for the primary-backup group; and, (b) selecting between member and group overwrite operations based upon such determination, wherein the member overwrite operation includes overwriting the copy of the replicated group state data for the rejoining member with data from the copy of the replicated group state data for an existing member in the primary-backup group, and wherein the group overwrite operation includes overwriting the copy of the replicated group state data for the existing member in the primary-backup group with data from the copy of the replicated group state data for the rejoining member.