a model-based approach for amf configuration generation pejman salehi, pietro colombo abdelwahab...

A Model-Based Approach for AMF Configuration Generation

Pejman Salehi, Pietro Colombo Abdelwahab Hamou-Lhadj, Ferhat Khendek

Concordia UniversityDepartment of Electrical and Computer Engineering

SAM 2010Oslo Norway October 5th

Outline

Introduction

Availability Management Framework (AMF)▫AMF configurations

AMF configuration design

Model based configuration generation

Conclusion

2

Introduction (High Availability)

Availability Downtime per Year

90% 36.5 days

99% 3.7 days

99.9% 9 hours

99.99% 53 min

99.999% 5 min

99.9999% 32 sec

3

High Availability: At least 99.999 % (a.k.a. five nines)

Availability is the probability that when a service is requested, it will be provided

Introduction (Availability Management)

Platform specific solution▫HPMC/Serviceguard and SunCluster:

detect nodes that fail and automatically failover application components to surviving nodes

Platform independent solution (Middleware)▫Using the best practices from different

platforms and domains ▫Portability

4

Service Availability Forum (SA Forum)

It is a consortium of industry-leading communications and computing companies working together to develop and publish high availability and management software interface specifications

It has defined a set of standardized services for high-availability▫ To enable portability and reusability across different

platforms by shifting the availability management from applications to a dedicated middleware

5

Availability Management Framework (AMF)

AMF is the middleware part responsible for managing the availability of the services provided by an application▫Managing the redundant components of

the application by dynamically shifting workloads of faulty components to healthy components

An AMF configuration for a given application is a logical organization of resources for providing and protecting services

6

AMF Configuration (example)

7

APT-A

SGT-A

SUT-A

CT-A CT-B

SVCT-A

CST-A CST-B

Node 1 Node2

App1(APT-A) SG1

(SGT-A) SU2(SUT-A)SU1(SUT-A)

Component3(CT-A)

Component4(CT-B)

Component1(CT-A)

Component2(CT-B)

SI2(SVCT-A)

CSI3(CST-A)

CSI4(CST-B)

SI1(SVCT-A)

CSI1(CST-A)

CSI2(CST-B)

RuntimeAccording to :Redundancy Model

Component: is a logical entity that represent a set of resources (hardware and/or software) to AMF.

Service unit: is a logical entity that represents a set of components that collaborate to provide a certain service.

Service group: is a group of service units that provide service availability to a set of service instances Application: is a set of service groupsComponent service instance: is a abstraction of the service provided by the component.

Service instance: is a abstraction of the service provided by the service unit.

Node: Represents a computational resource for the deployment.AMF entity types: are data structures that define the common characteristics among multiple instances of entities.

AMF Configuration Design

8

Service Description

Infrastructure Description

AMF Configuration Generator

AMF Configuration

Software Description

Protection Level

Entity Types File

(ETF)

Configuration

Requirements

SUT-AA

CT-AA CT-BB

SVCT-AA

CST-AA CST-BB

depends

A/S A/S

23SITemp1#Sis = 1

Svct = SVCT-AARM = 2N

# Active SUs = 1

CSITemp1#CSIs =2

CST = CST-AA

CSITemp2#CSIs =2

CST = CST-BB

depends

NodeTemp1#Nodes = 2

Cluster1


Challenges

The large number of entities and the numerous parameters (50 domain concepts and over 250 parameters)

The complexity of the concepts and their relationships defined in the AMF configuration domain (two level of abstraction)

The large number of constraints imposed by the domain (89 domain constraints)

The dynamic aspects of the AMF configurations

The ambiguity of the existing specifications in describing AMF configurations

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The manual or ad hoc approach is extremely tedious and error prone

It is necessary to have a systematic approach to the design of the AMF configurations ▫Dealing with the problem at the proper

level of abstraction▫Comprehensively specify the domain

specific artefacts▫Thoroughly define the required processes

10

Model-Driven Paradigm

Focuses on models and abstractions which are closer to the domain concepts

Shifts from the level of details to a higher level of abstraction

Increases efficiency, serviceability, quality and flexibility

11

Model based AMF Configuration Generation

12

Modeling Framework for

AMF Configuration Management

Entity Type Files Profile

AMF Profile

Entity Type Files Model

AMF Configuration

Model

<<instance Of>><<instance Of>>

Configuration Requirements

Profile


Model

<<instance Of>>

Model Based AMF Configuration Generation


13

ETF Type Selection T

AMF Entity Creation T

AMF Type Creation TEntity Type

Files Model


Model

Selected ETF Model

+ Configuration Requirements

Model

AMF Types Model


Model

AMF Configuration

Model

ETF Profile

CR Profile

AMF Profile ETF Profile

CR Profile

AMF Profile

CR Profile

<<instance Of>> <<instance Of>>

<<instance Of>>

<<instance Of>>

Selecting Software Entities

14

SITemp1#Sis =2


# Active SUs = 1

CSITemp1#CSIs =1

CST = CST-AA

CSITemp2#CSIs =1

CST = CST-BB

SUT-AA

CT-AA CT-BB

SVCT-AA

CST-AA CST-BB

SVCT-CC

CST-CC

CT-CC

SVCT-BB

depends

depends

CT-DD

SUT-CC

A/S A/SA/S A

23

Supporting the required servicesCapable of supporting the required Redundancy ModelCompliance with software capabilities and limitations Compliance with software dependency

Selecting the appropriate software entities capable of satisfying requirements


15




Files Model


Model

Selected ETF Model


Model

AMF Types Model


Model

AMF Configuration

Model

ETF Profile

CR Profile


CR Profile

AMF Profile

CR Profile


<<instance Of>>

<<instance Of>>

Design of the Type level Configuration Entities

16

SITemp1#Sis = 1


# Active SUs = 1

CSITemp1#CSIs =2

CST = CST-AA

CSITemp2#CSIs =2

CST = CST-BB

SUT-AA

CT-AA CT-BB

SVCT-AA

CST-AA CST-BB

depends

depends

A/S A/S

23

2NAPT-A

SGT-A

SUT-A

CT-A CT-B

SVCT-A

CST-A CST-B

Creating AMF Types from ETF Types Creating AMF Types missing from ETF Configuring the attributes Multiple scenarios and extension point for

quality attributes such as cost


17




Files Model


Model

Selected ETF Model


Model

AMF Types Model


Model

AMF Configuration

Model

ETF Profile

CR Profile


CR Profile

AMF Profile

CR Profile


<<instance Of>>

<<instance Of>>

Design of the instance level Configuration Entities

18

Node 1 Node2App1(APT-A) SG1

(SGT-A) SU2(SUT-A)SU1(SUT-A)

Component3(CT-A)

Component4(CT-B)

Component1(CT-A)

Component2(CT-B)

SI2(SVCT-A)

CSI3(CST-A)

CSI4(CST-B)

SI1(SVCT-A)

CSI1(CST-A)

CSI2(CST-B)

SITemp1#Sis = 1


# Active SUs = 1

CSITemp1#CSIs =2

CST = CST-AA

CSITemp2#CSIs =2

CST = CST-BB

depends

Creating AMF Service Entities Creating AMF Service Provider Entities Create the Structure of the Configuration Creating the Deployment Entities Configuring the attributes

NodeTemp1#Nodes = 2

Cluster1

APT-A

SGT-A

SUT-A

CT-A CT-B

SVCT-A

CST-A CST-B

Model based AMF Configuration Generation (Advantages)

Increases the level of abstraction at which the configuration designer has to specify configuration properties, abstracting away unnecessary details

Using declarative style transformation rules abstract from the operational steps

The model-driven configuration generation process is based on our newly created UML profile and can be embedded in any UML CASE tool

The approach is based on standards, namely UML, OCL, and ATL

Extendibility of the approach

19

Questions?

20

Entity Types File (ETF)

ETF is an SA Forum standard used to capture the description of the software

ETF represents:▫ The comprehensive description of the

software’s components▫ The capabilities of the software ▫ The services that can be supported by

components▫ The limitation of the software

components ▫ Software dependencies and

compatibility options▫ How the software’s components can be

combined ETF is provided by the software

developer

23

SUT-AA

CT-AA CT-BB

SVCT-AA

CST-AA CST-BB

depends

A/S A/S

23

a model-based approach for amf configuration generation pejman salehi, pietro colombo abdelwahab...

Documents

certain service

group of service units

nines availability

sec3high availability

set of components

logical entity

healthy components

redundant components