Abstract: Presented are methods and apparatus for protecting a plurality of High Availability (HA) Service Instances (SIs) with a plurality of Service Units (SUs) with an Nway redundancy model. Any of the SUs associated with the Nway redundancy model can simultaneously be assigned an active HA state for some of the SIs and a standby HA state for other SIs. However, only one SU can have the active state for any given SI. The Nway redundancy model is a configured prior to runtime operation.

Abstract: Among other things, embodiments described herein enable systems, e.g., Availability Management Forum (AMF) systems, having service units to operate with balanced loads both before and after the failure of one of the service units. A method for balancing standby workload assignments and active workload assignments for a group of service units in a system which employs an N+M redundancy model, wherein N service units are active service units and M service units are standby service units is described. An active workload that the N active service units need to handle is calculated and each of the N active service units in the group is provided with an active workload assignment based on the calculated active workload. Standby workload assignments are distributed among the M standby service units substantially equally.

Abstract: An Availability Management Framework (AMF) configuration describes how configuration entities of a highly available system are grouped and includes information on service provision and service protection policies against resource failure. The AMF configuration defines a set of failure types for each component and each node, and specifies a failure rate and a recommended recovery for each failure type. A method for evaluating service availability receives the AMF configuration as input, and analyzes it to obtain an actual recovery that the highly available system is to perform when the given component fails. The method maps the AMF configuration to a stochastic model that captures the dependencies among the components and among the configuration entities at multiple levels of the hierarchy. The method utilizes the model to calculate the service availability of the AMF configuration based on the failure rate, the actual recovery and the dependencies.

Abstract: Techniques for generating a system model for use by and availability management framework (AMF) are described. Inputs are received, processed and mapped into outputs which are further processed into a configuration file in an Information Model Management (IMM) Service eXternal Markup Language (XML) format which can be used as a system model by an AMF.

Abstract: Among other things, embodiments described herein enable systems, e.g., Availability Management Forum (AMF) systems, having service units to operate with balanced loads both before and after the failure of one of the service units. A configuration can be generated which provides for distributed backup roles and balanced active loads. When a failure of a service unit occurs, the active loads previously handled by that service unit are substantially evenly picked up as active loads by remaining service units.

Abstract: Techniques for generating a system model for use by and availability management framework (AMF) are described. Inputs are received, processed and mapped into outputs which are further processed into a configuration file in an Information Model Management (IMM) Service external Markup Language (XML) format which can be used as a system model by an AMF.

Abstract: Techniques for generating a system model for use by an availability management function (AMF) are described. Inputs are received, processed and mapped into outputs which are further processed into a configuration file in an Information Model Management (IMM) Service external Markup Language (XML) format which can be used as a system model by an AMF.