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Performance Management (Best Practices)


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Title: Performance Management (Best Practices)

Performance Management(Best Practices)
  • Document ID 15115

  • Performance Management involves optimization of
    network response time and management of
    consistency and quality of individual and overall
    network services
  • Need to measure the user/application response time

Performance management issues
  • User performance
  • Application performance
  • Capacity planning
  • Proactive fault management
  • It is important to note that with newer
    application like video and voice performance
    management is the key success

Indicators for performance management (1/3)
  • Document the network management business
  • Create detailed and measurable service level
  • Provide documentation the service level agreement
    (SLA) with charts or graphs that show the success
    or failure of how these agreements are met over
    the time

Indicators for performance management (2/3)
  • Collect a list of the variables for the baseline
    such as polling interval, network management
    overhead incurred, possible trigger threshold
  • Have a periodic meeting that reviews the analysis
    of the baseline and trends.

Indicators for performance management (3/3)
  • Have a what-if analysis methodology documented.
  • When thresholds are exceed, develop documentation
    on the methodology used to increase network

Performance management process flow (1/3)
Performance management process flow (1/3)
  • 1 develop a network management concept of
  • Define the required features Services,
    Scalability and Availability objectives
  • Define availability and network management
  • Define performance SLAs and Metrics
  • Define SLA

Performance management process flow (2/3)
  • 2 Measure Performance
  • Gather network baseline data
  • Measure availability
  • Measure response time
  • Measure accuracy
  • Measure utilization
  • Capacity planning

Performance management process flow (3/3)
  • 3 perform a proactive fault analysis
  • Use threshold for proactive fault management
  • Network management implementation
  • Network operation metrics

Performance management process flow
Develop a network management concept of operation
  • The purpose is to describe the overall desired
    system characteristics from an operational
  • The use of this document is to coordinate the
    overall business goals of network operation,
    engineering, design other business units and the
    end users.

Define the required features Services,
Scalability objectives (1/2)
  • Define services objectivesWhat services the
    network provide
  • to understand applications, basic traffic flows,
    users and site counts
  • Define scalability objectives How many users to
    use the network, also the capacity consumed on
    the network
  • media capacity, number of routes and users

Define the required features Services,
Scalability objectives (2/2)
  • These are the standard performance goals
  • Response time
  • Utilization
  • Throughput
  • Capacity (maximum throughput rate)

Define availability and network management
objectives (1/2)
  • Define Availability objectives
  • define the level of services (service level
  • define different class of service for a
    particular organization
  • Higher availability objective might necessitate
    increased redundancy and support procedures

Define availability and network management
objectives (2/2)
  • Define manageability objectives
  • To ensure that overall network management does
    not lack management functionality
  • Must understand the process and tools for
  • Uncover all important MIB or network tool

Define performance SLAs and Metrics
  • The performance SLAs metrics such as
  • average expected volume of traffic,
  • peak volume of traffic,
  • average response time and maximum response time
  • Availability
  • Down Time

Define SLAs
  • SLA (Service Level Agreement) - enterprise
  • SLM (Service Level Management) service provider
  • SLM include definitions for problem types and
    severity and help desk responsibilities
  • Escalation path, time before escalation at each
    tier support level
  • Time to start work on the problem
  • Time to close target based on priority
  • Service to provide in the area of capacity
    planning, hardware replacement

Performance management process flow
Measure Performance
  • Gather Network Baseline data
  • Perform a baseline of the network before and
    after a new solution deployment
  • A typical router/switch baseline report includes
    capacity issues related to CPU, memory, buffer,
    link/media utilization, throughput
  • Application baseline bandwidth used by app per
    time period

Measure availability
  • Availability is the the measure of time for which
    a network system or application is available to a
  • Coordinate the help desk phone calls with the
    statistics collected from managed devices
  • Check scheduled outages
  • Etc

Measure Response Time
  • Network response time is the time required to
    travel between two points
  • Simple level pings from the network management
    station to key points I the network. (not
  • Server-centric polling SAA (Service Assurance
    Agent) on router (Cisco) to measure response time
    to a destination device
  • Generate traffic that resembles the particular
    application or technology of interest

Measure accuracy
  • Accuracy is the measure of interface traffic that
    does not result in error and can be expressed in
    term of percentage
  • Accuracy 100 error rate
  • Error rate ifInErrors 100 / (ifInUcastPkts

Measure Utilization (1)
  • Utilization measure the use of a particular
    resource over time
  • Percentage in which the usage of a resource is
    compared with its maximum operational capacity
  • High utilization is not necessarily bad
  • Sudden jump in utilization can indicate unnormal

Measure Utilization (2)
  • Input utilization
  • ifInOctets 8100/(time in second)ifSpeed
  • Output Utilization
  • ifOutOctets 8100/(time in second)ifSpeed

Capacity planning
  • The following are potential areas for concern
  • CPU
  • Backplane or I/O
  • Memory
  • Interface and pip sizes
  • Queuing, latency and jitter
  • Speed and distance
  • Application characteristics

Performance management process flow
Perform a Proactive fault analysis
  • One method to perform fault management is through
    the use of RMON alarms and event groups
  • Distributed management system that enables
    polling at a local level with aggregation of data
    at a manager to manager

Use threshold for proactive fault management (1/2)
  • Threshold is the point of interest in specific
    data stream and generate event when threshold is
  • 2 classes of threshold for numeric data
  • Continuous threshold apply to continuous or time
    series data such as data stored in SNMP counter
    or gauges
  • Discrete threshold apply to enumerated objects or
    discrete numeric data such as Boolean objects

Use threshold for proactive fault management (2/2)
  • 2 different forms of continuous threshold
  • Absolute use with gauges
  • Relative (delta) use with counter
  • Step to determine threshold
  • 1 select the objects
  • 2 select the devices and interfaces
  • 3 determine the threshold values for each object
    or interface
  • 4 determine the severity for the event generated
    by each threshold

Network management implementation
  • The organization should have an implemented
    network management system.
  • SNMP/RMON or other network management system tools
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