Abstract: Systems, methods, and software are disclosed that provide enhanced replication for message services. In one implementation, updates to a replication source are replicated to replication targets. The replication is monitored to identify an individual health of the replication for each of the replication targets. A composite health of the replication is determined based on the individual health of the replication for each of the replication targets. The updates to the replication source are then controlled based on the composite health of the replication.

Abstract: Systems, methods, and software are disclosed that provide enhanced replication for message services. In one implementation, updates to a replication source are replicated to replication targets. The replication is monitored to identify an individual health of the replication for each of the replication targets. A composite health of the replication is determined based on the individual health of the replication for each of the replication targets. The updates to the replication source are then controlled based on the composite health of the replication.

Abstract: Systems, methods, and software are disclosed that provide enhanced replication for message services. In one implementation, updates to a replication source are replicated to replication targets. The replication is monitored to identify an individual health of the replication for each of the replication targets. A composite health of the replication is determined based on the individual health of the replication for each of the replication targets. The updates to the replication source are then controlled based on the composite health of the replication.

Abstract: Systems, methods, and software are disclosed that provide enhanced replication for message services. In one implementation, updates to a replication source are replicated to replication targets. The replication is monitored to identify an individual health of the replication for each of the replication targets. A composite health of the replication is determined based on the individual health of the replication for each of the replication targets. The updates to the replication source are then controlled based on the composite health of the replication.

Abstract: A data resiliency layer provides manageable data resiliency policy options for email related applications. Through one or more APIs such applications are enabled to query whether a data resiliency policy is satisfied for a given mailbox or database at a given point in time. Email related applications may consume this information to modify their behavior such as to wait, repeat, or fail the actions at hand to the point where data committal is guaranteed to a degree specified by the data resiliency policy.

Abstract: A data resiliency layer provides manageable data resiliency policy options for email related applications. Through one or more APIs such applications are enabled to query whether a data resiliency policy is satisfied for a given mailbox or database at a given point in time. Email related applications may consume this information to modify their behavior such as to wait, repeat, or fail the actions at hand to the point where data committal is guaranteed to a degree specified by the data resiliency policy.

Abstract: Detecting the failure of file transfers via a network copy service from a source computer to a destination computer via a network monitoring service. If the network monitoring service determines that the source computer is no longer available, the destination computer initiates a second file transfer request via the network copy service from a second source of the file.

Abstract: A cluster system including as few as two cluster nodes and a plurality of links, each one of the plurality of links coupling one of the cluster nodes to a voting device wherein a single surviving cluster node obtain a vote from the voting device. A method of establishing quorum in a cluster system including as few as two cluster nodes, the method comprising determining a single surviving cluster node of the as few as two cluster nodes, obtaining a vote from a voting device, and establishing quorum such that cluster operations are continued by the single surviving cluster node. A method for preventing a partition-in-time quorum establishment problem in a cluster system including as few as two cluster nodes, the method comprising determining that a revived cluster node is also a sole active cluster node of the cluster system, checking a last-surviving flag of the sole active cluster node, and if the last-surviving flag is set to FALSE, not restarting cluster operations.

Abstract: In clusters of multiprocessor systems it is important that these processor nodes are aware of each others availability and performance capabilities. In highly available systems using these multiprocessor systems there needs to be a method to dynamically bring nodes both into the cluster and to remove nodes out of the cluster. The processor node that is responsible for these actions is designated the manager node (50). The manager node has a pre-selected backup to assume this responsibility upon the inability of said manager node to fulfill its duties. To allow the cluster of nodes to communicate with each other efficiently there needs to be a distributed messaging system that allows for the rapid distribution of data messages among the cluster nodes.

Abstract: A cluster system including as few as two cluster nodes and a plurality of links, each one of the plurality of links coupling one of the cluster nodes to a voting device wherein a single surviving cluster node obtain a vote from the voting device. A method of establishing quorum in a cluster system including as few as two cluster nodes, the method comprising determining a single surviving cluster node of the as few as two cluster nodes, obtaining a vote from a voting device, and establishing quorum such that cluster operations are continued by the single surviving cluster node. A method for preventing a partition-in-time quorum establishment problem in a cluster system including as few as two cluster nodes, the method comprising determining that a revived cluster node is also a sole active cluster node of the cluster system, checking a last-surviving flag of the sole active cluster node, and if the last-surviving flag is set to FALSE, not restarting cluster operations.

Abstract: This computer implemented software invention supervises networked system resources with the goal of maximizing service availability, providing on-demand and uninterrupted access to service, and minimizing the down time due to failures. It is a cluster-wide solution that co-ordinates the states and activities of resources, assigns availability roles, implements recovery from failures, and implements overall system policy. To do this, it maintains a system model of the system's physical and logical configuration and models the resources using managed objects that provides an extensive representation of the states, roles, and relationships of the systems resources.

Abstract: In clusters of multiprocessor systems it is important that these processor nodes are aware of each others availability and performance capabilities. In highly available systems using these multiprocessor systems there needs to be a method to dynamically bring nodes both into the cluster and to remove nodes out of the cluster. The processor node that is responsible for these actions is designated the manager node (50). The manager node has a pre-selected backup to assume this responsibility upon the inability of said manager node to fulfill its duties. To allow the cluster of nodes to communicate with each other efficiently there needs to be a distributed messaging system that allows for the rapid distribution of data messages among the cluster nodes.