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What is SLA  in terms of Performance Management? How can we calculate this?

Can any body throw some light on this .




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SLA is about the expected bench marks from client.

Thanks Siddiq.

SLA means service level agreement.

generally two type of greement are there in SLA.

1. System availability.

2.Response time.

What ever Siddiq was defined here that is right. This is a expected bench mark of client and you have to clearly define the same goal while criteria your scenario for Load Test.

SLA status set in time intervals over a timeline: Example, every 10 seconds—over a timeline within the run.
1. SLAs for Average Transaction Response Time
2. SLAs for Errors per Second.
SLA status determined over the whole run. Analysis displays a single SLA status for the whole scenario run.
1. Total Hits per run
2. Average Hits (hits/second) per run
3. Total Throughputs (bytes) per run
4. Average Throughput (bytes/second) per run

Load Criteria: Select the relevant load criteria
Set Threshold Values: Define the acceptable average transaction response times

Service Level agreement decided the delivery date of modules, it is dependent of user needs urgency. According to SLA we can set priority of issue.

A service-level agreement (SLA) is a part of a service contract where the level of service is formally defined SLA is refer to the contracted delivery time (of the service) or performance.

SLA will typically have a technical definition in terms of mean time between failures (MTBF), mean time to repair or mean time to recovery (MTTR); various data rates; throughput; jitter; or similar measurable details.

Please Check this link for futher details: http://en.wikipedia.org/wiki/Service-level_agreement

SLA is a formal document negotiated between the parties, in hiring an IT service or Telecommunications. The SLA is usually placed as an annex of the contract and aims to specify the minimum acceptable for the proposed service. Failure to comply with the SLA implies penalties stipulated in the contract for the service provider.

An SLA may cover items such as quality of service, criteria for charging, provisioning, service process and reports provided to the client.

An SLA should contain objective and measurable parameters which the service provider undertakes to meet.
For each service type and each segment or sector of industry there is a different SLA and this should be focused on measuring one specific service.
To measure the service quality of the area and more specifically of the teams and suppliers of software testing some SLAs are commonly used as follows:

• Number of defects found in production vs. Number of defects found in homologation
• Number of defects / Number of test cases
• Number of defects canceled / total number of defects found
• Average time to retest
• Average execution time for test cases
• Deadline for answering requests for tests



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