Performance Management

1
Performance Management

• CS555 Introduction to Networks and Communication
• Sairam Sudarsana Babu Kambhala

2
Contents

• Introduction
• What is Performance Management?
• What its Benefits?
• How to accomplish it?
• How to report performance information?
• Conclusion
• References and websites
• Questions

3
Introduction

• What is Network Management?
• It is the process of controlling a complex data
  network to maximize its efficiency and
  productivity.
• Goals
• Higher network availability
• Reduce network operational Cost
• Reduce network bottlenecks
• Increase flexibility of operation and integration
• Higher efficiency
• Ease of use
• Security

4
The Five Functional Areas

• Fault Management
• Configuration Management
• Security Management
• Performance Management
• Accounting Management

5
Performance Management

• It involves ensuring that the network is
  accessible and uncrowded.

6
Benefits of Performance Management

• Helps the network engineer to reduce network
  overcrowding and inaccessibility.
• Helps the engineer to determine utilization
  trends.
• Isolate performance problems.
• This helps in capacity planning which in turn
  helps in determining how additional traffic will
  affect the overall network.
• Helps in predicting peak utilization and
  consequently avoid poor performance.
• Example An RMON(Remote Network Monitoring)
  device is one example of using real-time
  network data for long-term trend analysis.

7
Accomplishing Performance Management

• It involves four steps
• a.) Collecting the current network utilization
  data of networks devices and links.
• b.) Analyze relevant data.
• c.) Setting utilization thresholds.
• d.) Using Network Simulation.

8
Collecting Utilization Data

• On a file server , utilization may best be
  measured by processor load , disk access rate
  ,network interface card utilization etc.
• On a bridge or a router , it can be measured by
  packet forwarding rate , percentage of dropped
  frames number of packets being held in a queue
  etc.
• Link utilization is the amount of bits sent per
  second and the amount of bits received per second
  divided by the total bandwidth.
• Util(total bits sent total bits
  received)/bandwidth

9
Collecting Utilization Data

• For full-duplex serial links,
• UtilMAX(total bits sent , total bits
  received)/bandwidth
• Over utilization ?decrease in the level of
  service to users
• Level of service can be measured by determining
• Total response time
• Rejection rate
• Availability

10
Data Analysis

• Required to extract important information from
  the performance-related data.
• Can be done easily through graphical
  representation of the utilization of a network
  device or link.

11
Data Analysis

• Most of real-time graphs that are useful concern
  to the resources of the network devices and
  links like
• a.) Device Information Memory usage , processor
  utilization , disk access rate , number of
  sessions etc.
• b.) Link information utilization , error rates ,
  error percentages etc.
• Graphs can be on
• a.) current data
• b.) historical data.

12
Setting Thresholds

• For a network device processor utilization and
  alarm durations.
• For a link error rate , average utilization and
  overall throughput.
• Trial and error or counters and gauges help in
  producing a reasonable threshold value.
• Counter threshold can have a simple single value
  or multiple values.
• Gauge threshold has notifyLow and notifyHigh
  values.
• (notifyHigh gt notifyLow).When these values
  are crossed , notifications are generated.

13
Setting Thresholds

• Counter and gauge concepts
• When performance-related thresholds are reached ,
  alarms are sent to a systems administrator
  meaning that some action is required.

14
Using Network Simulation

• A Network Simulation tool helps in building a
  data network that performs to users
  expectations.
• Helps to determine how to alter a network for
  more efficient use and higher performance.
• It can be used to project how network growth will
  affect performance metrics.
• A network model defines how the simulation should
  calculate each component and how it should react
  to the simulation criteria.

15
Reporting Performance Information

• The most common format is a text report.
• It can also be represented in graphical format or
  bitmapped display .

16
Conclusion

• The goal is to measure and make available various
  aspects of network performance so that
  internetwork performance can be maintained at an
  acceptable level.
• To optimize your network infrastructure for
  application performance, you need complete,
  enterprise-wide visibility into the composition
  of traffic in data network.

17
References Websites

• Network management A Practical Perspective
• --Allan Leinwand, Karen Fang Conroy
• Network Management Systems Essentials
• --Divakara K. Udapa
• http//www.netqos.com
• http//www.cisco.com/en/US/docs/internetworking/te
  chnology/handbook/NM-Basics.html

18

• Thank You
• Any Questions?