Application layer self managed services

Application layer self managed services

1. 1) ADaaAS

   • Adaptability as an Application Service (ADaaAS) is the ability to provide timely and efficient support of application on system changes and events.
     • It resembles the application incident management role that manages changes and incidents at the application layer.
       • This role also coordinates with other management roles at the virtual layer.
         • DaaAS should always ensure that the overall system properties are preserved (e.g. resilience, availability and reliability) when taking an action
           • It should also automatically decide on an action plan and then manages it by coordinating with other services in the same or other layers.

2. 2) RSaaAS

   • is the ability of a system to maintain an application features (e.g. serviceability and security) despite a number of component failures.
     • High resilience at the application layer can be achieved by providing high resilience at the virtual layer and well planned procedures which we discuss in the next subsection
       • Requires application redundancy can be of two types
         • Active/Passive Active/Active.

3. 3) SCaaAS

   • is about providing an application with the capabilities to instantaneously and efficiently adapt to the addition and removal of virtual resources.
     • These should not affect fundamental system properties and should always represent user requirements

4. 4) AVaaAS

   • represents the relative time a service provides its intended functions
     • High levels of availability are the result of excellent resilient design
       • is in charge of distributing requests coming to an application across all redundant application
         • If a resource is down or it is relatively overloaded, the AVaaAS should immediately stop diverting traffic to that resource

5. 5) RLaaAS

   • is related to the success in which a service functions.
     • High end-to-end service reliability implies that a service always provides correct results and guarantees no data loss
       • Higher individual components reliability together with excellent architect and well defined management processes
         • RLaaAS is of higher priority than AVaaAS service, as RLaaAS ensures that an end-to-end service integrity is maintained