Capacity Management in ITIL, ITIL Course
Service Design
Capacity Management
Purpose and Objectives
Capacity Managementensures cost justifiable IT capacity exists to meet current and future business needs. Capacity Management also ensures that there is adequate IT capacity to performIT activities and processes, and available capacityis optimized.
The purpose of CapacityManagement is to ensure the current and futurecapacity and performance demands of customer regarding IT service provision are delivered against justifiable costs.
Objectives ofCapacity Management include the following:
• Produce and maintain appropriate and updated Capacity Plan.
• Provide advice and guidance on all capacity- and performance-related issues.
• Ensure serviceperformance meet or exceed agreed targets.
• Assist with diagnosis and resolution of performance- and capacity-related incidents and problems.
• Ensure proactive measures to improve the performance of services are implemented.
Capacity Managementis the process that manages:
• The right capacity
• At the right location
• At the right moment
• For the right customer
• Against the right costs
Scope
The capacity management process shouldbe the focal point for all IT performance and capacity issues.
The capacity management process shouldinclude:
• Monitoring patterns of business activity through performance, utilization and throughput of IT services and the supporting infrastructure, environmental, data and applications components and the production of regular and ad hoc reports onservice and component capacity and performance
• Undertaking tuning activities to make the most efficient use of existing IT
resources
Capacity Management in ITIL, ITIL Course
• Understanding the agreed current and future demands being made by the customer for IT resources, and producing forecasts for future requirements
• Influencing demand in conjunction with the financial management for IT
services and demandmanagement processes
• Producing a capacity plan that enables the service provider to continue to provide services of quality defined in SLAs and that covers a sufficient planning timeframe to meet future service levels required as defined in the service portfolio and SLRs
• Assisting withthe identification and resolution of any incidents and problems associatedwith service or component capacity or performance
• The proactive improvement of service or componentperformance, wherever it is cost justifiable and meets the needs of the business
Concepts
Capacity Managementcontains sub-process with distinct functions of each. The sub-processes are:
• Business Capacity Management: This sub-process translate business needs and plans into requirements for service and IT infrastructure.
• Service Capacity Management: This sub-process manages, controls and predicts the end-to-end performance and capacity of the live, operational IT services usage and workloads.
• Component Capacity Management: Thissub-process manages, controls and predicts the performance, utilization and capacity of individual IT technology components.
Some important concepts are:
• Demand Management: Influence user and customer demand for IT services and manage the impact on IT components.
• Modeling: Predict the behavior of computer systems by making estimates based on experience and current component utilization information, to pilot studies, prototypes and full-scale benchmarks. Some modeling techniques are as follows:
Baselining: This is the first stage in modeling, creating a baseline model that accurately reflects the processbeing achieved.
Trend analysis: This can be performed on component utilization and serviceperformance information.
Analytical models: These are representations of the behavior of computer systems using mathematical techniques.
Simulation modeling: This involves the modelingof discrete events, sizing new applications and predicting the effects of changes on existing applications.
• Application Sizing: Estimate the resourcerequirements to supporta proposed change to an existing service or the implementation of a new service.
• Capacity Plan: Outlines the IT resources and funding needed to support the business plan as well as cost justification of expenditures.
• The Capacity Management Information System (CMIS): Holds the information needed by all sub-processes within CapacityManagement.
Role
Some of the tasks of a Capacity Manager include:
• Ensure adequate IT Capacity, senior IT management accurately advised on how to match Capacity and Demand, and optimize existing Capacity.
• Identify capacity requirements with Service Level Management.
• Understand the current usage of the infrastructure and IT services.
• Performing sizing on all proposed new services and systems.
• Predicting future capacity requirements based on trends.
• Produce, conduct regular review and revise the Capacity Plan.
• Ensure appropriate levels of monitoringresources and system performance are set.
• Analysis and reporting of usage and performance data.
• Ensure that all changesare assessed.
• Conduct performance testing of new services and systems.
• Determines performanceservice levels.
• Act as a focal point for all capacity and performance issues.
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Capacity Management in ITIL, ITIL Course