The quality of operational services delivered by Resource Centres is measured with availability and reliability metrics, computed from the results of periodic tests performed at all certified centres.
Availability of a service or a site represents the percentage of time that the services or sites were up and running ([uptime / total time]x100).
Reliability of a service or a site represents the percentage of time that the services or sites were supposed to be up and running, excluding scheduled downtime for maintenance and other purposes ([uptime / (total time – scheduled time)]x100).
For example: During a given 10 days, site A registered 90% availability, which means its services were up for the equivalent of 9 days. But reliability for this period was higher at 95%. This means that part of the time that the services were not available was due to scheduled maintenance work. Thus while the service was available for 90% of the time, its users could rely on it for 95% of the ten days.
Availability and reliability are monitored hourly through the Service Availability Monitoring framework (SAM), and reports are generated monthly. Certified Resource Centres guarantee 70% availability and 75% reliability for their services. The minimum availability and reliability values accepted for a Resource Centre are defined in Operational Level Agreements established with EGI.eu.
EGI overall Availability and Reliability
Live availability and reliability statistics on MyEGI (personal certificate required)