Patent ID: 7711820
Filing Date: 2010-05-04
Classification: G06F,H04L

Abstract:
1. A method for providing high availability at a virtual logical unit number server (VS), the method comprising: detecting a heartbeat timeout between a first VS and a second VS in a service-group cluster, the first VS having a first VS write region, the second VS having a second VS write region, and the first VS and the second VS sharing an ownership region; writing an identifier associated with the first VS into a first VS write region when it is determined that the second VS write region is clear; wherein the writing the first VS write region is triggered upon detecting a the heartbeat timeout at a the first VS; writing the ownership region when it is determined that the ownership region is clear; operating the first VS as the standalone master VS upon writing the ownership region; and wherein the second VS operates in the isolated state upon operating the first VS as the standalone master VS.