A performance OLA uses the following key metrics to measure operational level compliance. You can choose to monitor some or all of these operational levels in your OLA:
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Operational Level Metric
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Details
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Network Round Trip Time
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- Configure by network type, especially for WAN links.
- Verify that the networks with similar latency are grouped together.
- Monitor business critical applications, especially for WAN links.
- Select applications that represent the largest (or most constant) amount of traffic to each site to get more observations and statistical significance.
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Server Response Time
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- Do not separate by network type.
- Servers should treat requests independently no matter which network they came from.
- Monitor the most influential tier in a multi-tiered application and keep in mind that front end server response time will include back-end server requests.
- Monitor servers for business critical applications
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Total Transaction Time
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- Best indicator of overall end user experience because it is dependent on Server Response Time, Network Round Trip Time, and Data Transfer Time.
- Configure on a per network type basis because it depends on network round trip time.
- Monitor business critical applications
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