Analytical Availability Assessment of IT-Services

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1 Analytical Availability Assessment of IT-Services Miroslaw Malek * Bratislav Milic * Nikola Milanovic ** * Humboldt-Universität zu Berlin ** Technische Universität Berlin

2 System Layers Business Processes Services ICT Infrastructure

3 The Challenge Definition of service-availability: Fault model Types of service availability Service availability is the function of the availability of the underlying ICT-layer: Hardware Software Network Supporting infrastructure Personnel Determine functional dependency between the ICT-layer availability and service availability using an analytical, model-based approach

4 Reference Architecture

5 Service-ICT Mapping and Service Availability Assessment 1. A service is described in high-level modeling language (e.g., UML activity diagram, BPMN) 2. A CMDB system collects ICT-layer data (infrastructure graph) which are parameterized (e.g., with MTTF and MTTR) 3. Service activities are mapped onto the infrastructure graph elements, all paths between source and destination for each activity are identified 4. Services of importance are identified 5. The mapped service description is transformed into a formal models (e.g., RBD or FT) BPMN - Business Process Modeling Notation CMDB - Configuration Management Database

6 Service Description (BPMN) - Example

7 Infrastructure Graph and Parameterization CL i client i R i router I Ch 2 communication channel (e.g., Ethernet cable, switch) DNS i DNS server i MS mail server Out i outside Internet network connection Exponential distribution, =1/MTTF, μ=1/mttr Router Channel DNS Mail Client Out1 Out2 MTTF MTTR

8 Service-ICT Mapping (1) In order to send an , both clients have to resolve the address of the SMTP server: CL 1 DNS: (CL 1 &CH 1 &R 1 &CH 2 &DNS 1 ) (CL 1 &CH 1 &R 1 &CH 2 &CH 3 &DNS 2 ) CL 2 DNS: (CL 2 &CH 9 &R 2 &CH 4 &CH 3 &DNS 1 ) (CL 2 &CH 9 &R 2 &CH 4 &&DNS 2 ) A connection with SMTP servers is established: CL 1 MS:CL 1 &CH 1 &R 1 &CH 2 &CH 3 &CH 4 &R 2 &CH 5 &MS CL 2 MS:CL 2 &CH 9 &R 2 &CH 5 &MS

9 Service-ICT Mapping (2) Mail server determines the forward SMTP address: MS DNS: (MS&CH 5 &R 2 &CH 4 &CH 3 &DNS 1 ) (MS&CH 5 &R 2 &CH 4 &DNS 2 ) Mail server forwards the to the out connection: MS OUT: (MS&CH 6 &R 3 &CH 7 &OUT 1 ) (MS&CH 6 &R 3 &CH 8 &OUT 2 ) For successful service execution, the steps have to been executed serially: CL 1 : (CL 1 DNS)&(CL 1 MS)&(MS DNS)&(MS OUT) = CL 1 &MS&R 1 &R 2 &R 3 &CH 1 &CH 2 &CH 3 &CH 4 &CH 5 &CH 6 &(DNS 1 DNS 2 )&(CH 7 &OUT 1 CH 8 &OUT 2 ) CL 2 : (CL 2 DNS)&(CL 2 MS)&(MS DNS)&(MS OUT) = CL 2 &MS&R 2 &R 3 &CH 9 &CH 4 &CH 5 &CH 6 &(CH 3 &DNS 1 DNS 2 )&(CH 7 &OUT 1 CH 8 &OUT 2 )

10 Model Generation

11 Availability Assessment (1) User-perceived service availability: Client 1 Client 2 MTTF MTTR A Total service availability u 1 u 2 A s A s = n i= 1 A i u i u i utilization factor ( u i =1) i

12 Availability Assessment (2) Incomplete service description or network topology Lower bound: CL&MS&DNS 1 &DNS 2 &R 1 &R 2 &R 3 &OUT 1 &OUT 2 - Upper bound: CL MS DNS 1 DNS 2 R 1 R 2 R 3 OUT 1 OUT 2 - Intermediate: CL&MS&(DNS 1 DNS 2 )&R 1 &R 2 &R 3 &(OUT 1 OUT 2 ) Client 1 Client 2 Lower Intermediate Upper MTTF e+22 MTTR A e-24 Availability data about ICT-layer are not known: Qualitative parameterization Quantitative parameterization

13 The Complete Process at a Glance Client 1 Client 2 MTTF MTTR A u 1 u 2 A s CL 1 : (CL 1 DNS)&(CL 1 MS)&(MS DNS)&(MS OUT) = CL 1 &MS&R 1 &R 2 &R 3 &CH 1 &CH 2 &CH 3 &CH 4 &CH 5 &CH 6 &(DNS 1 DNS 2 )&(CH 7 &OUT 1 CH 8 &OUT 2 ) CL 2 : (CL 2 DNS)&(CL 2 MS)&(MS DNS)&(MS OUT) = CL 2 &MS&R 2 &R 3 &CH 9 &CH 4 &CH 5 &CH 6 &(CH 3 &DNS 1 DNS 2 )&(CH 7 &OUT 1 CH 8 &OUT 2 )

14 Tool s Architecture

15 Application Areas Technical Assessment of existing services and infrastructures Monitoring the infrastructure and reacting to changes Predicting the impact of changes on availability (simulation) Weak spots and single point of failure identification Building block for availability optimization Business Reducing missed opportunities Return on investment analysis SLA parameterization Risk analysis Enterprise availability certification

16 Summary and Open Issues Service-ICT mapping and automatic model generation are the cornerstone of our approach Independence of the formal availability model Capturing not only HW/SW but also supporting infrastructure (e.g., power supply, organization, physical security) and personnel Next (big) step: business process availability N. Milanovic, B. Milic, M. Malek: Modeling Business Process Availability, IEEE International Workshop on Methodologies for Non-functional Properties in Services Computing (MNPSC), Hawaii, July 2008 Open issues: ICT-layer components parameterization Richer model output (e.g., Markov chains, SANs) required for interval availability computation Need for field data (services, ICT, parameters, topologies, )

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