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Performance Management

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  1. Performance Management IACT 418/918 Autumn 2005 Gene Awyzio SITACS University of Wollongong

  2. Overview • Performance Management is the process of ensuring that • Network devices are NOT overloaded • Links are NOT saturated • This is achieved by • Monitoring devices and links to determine utilisation and error rates • Helping network to provide consistent service by • Ensuring capacity of devices and links are not overtaxed and thus impacting on performance • Performance management involves the following steps • Data collection • Data analysis • Setting thresholds • Using simulation

  3. Benefits of the Performance Management Process • Reduces problems of • Network overcrowding • Network inaccessibility • Collected data can be used to • Isolate components that are heavily utilised • Determine utilisation trends • Peak loads • High load periods • Scheduling of data transfers • Isolate performance problems

  4. Accomplishing Performance Management • Performance management involves the following steps • Data collection • Data analysis • Setting thresholds • Using simulation

  5. Data Collection • Data required is the current utilisation of network devices and links • File server • Packet forwarding rate • Processor load • % of dropped frames • Disk access rate

  6. Data Collection • Bridge or Router • Packet forwarding rate • % of dropped frames • Queue lengths • Links • (bits sent + bits received)/bandwidth • MAX (bits sent, bits received)/bandwidth – Full duplex

  7. Data Collection • Level of service • Total response time • Rejection rate • Availability

  8. Data Analysis • Real time or historical • RT useful for troubleshooting • Device information: memory usage, processor utilisation, disk access rate etc • Link Information: utilisation, error rates, error % etc • Historical useful for trend analysis • Capacity planning • Network redesign • Error trends • Bar or line

  9. Setting Thresholds • Utilisation thresholds may be set on • Devices • Processor utilisation • Alarm duration • Links • Error rate • Average utilisation • Overall throughput/goodput • Reports can be generated when thresholds are reached

  10. Setting Thresholds • Determining thresholds can be a bit of a hit-and-miss activity • Thresholds will enable the network manager to locate and fix a problem BEFORE it affects the network

  11. Using Simulation • Simulation can be used to • Determine how to reconfigure network • Assess the impact of a new application • Assess impact of application configuration

  12. Performance Management on a Network Management System • Simple • Monitor real time performance of devices and links • Produce graphs for review • More complex • Capture data to a database • Provide means for setting thresholds • Set alarms based on thresholds • Advanced • Historical analysis • Network simulation

  13. Reporting Performance Information • Can be achieved in may forms • Text based • Graphical • Charts • Link colour or thickness • Flashing • Iconic

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