Difference between revisions of "New Availability Reporting"
Revision as of 15:11, 6 January 2015
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Use case 1: NGI availability reports
We would like to have NGI Availability reports. These reports should include the central services operated by the NGI, this including the regional tools and other middleware core services operated, for example:
- the VOMS service
- the top-BDII service
- the WMS service
and the operational services including
- the NGI SAM service
- the accounting portal and repositories (where available)
- the NGI operations dashboard (where available)
- the NGI helpdesk (where available)
The concerned services would be only those for which the NGI has direct administration responsibilities. For example the NGI availability reports shouldn't include WMS, VOMS etc. instances that are independently deployed by the sites to support local user communities and local projects.
It is important to consider that a NGI core services is often physically distributed across different sites, that only have the role of hosting the hardware (but no administration responsibility). This has several implications.
- If one instance is down but the rest of the cluster is up, then the "logical" service is still available. This means that the alias should be monitored for the sake of availability computation, not the individual physical instances
- The site availability should not be impacted by the unavailability of physical instances of a service operated by the NGI.
This use case could be satisfied by: - grouping NGI services into a dedicated NGI site (in case of a distributed service, only the alias is registered) - create a NGI availability profile just applicable to the "NGI" site, where the availability of the site is computed as the AND composition of the availability of all registered services. Note that if some (optional) services are NOT available, then UP should be returned, i.e. the profile should include a mandatory set of services (e.g. regional SAM) and a complementary set of optional services (e.g. the local helpdesk, VOMS, etc.)
Use case 2: EGI.eu availability reports
We would like to measure the overall availability of EGI.eu services. Example of such services are:
- accounting portal and accounting repository
- operations portal
- central MyEGI
- message bus
- security Nagios and Pakiti
- security dashboard
- DTEAM VOMS
- OPS VOMS
- Overall availability of all EGI production sites
- EGI repository
- application database
- training database
For each category above, for example operations, EGI.eu operations service is UP if (GGUS is UP) AND (Operations Portal is UP) AND ... AND (GOCDB is UP).
In GOCDB the VIRTUALOPS ROC could be evolved into the EGI.eu ROC, which includes all EGI.eu services. An new availability profile for EGI.eu is needed.
Use case 3: Regionalized NGI availability reports
The regional VO support in operations tools is essential for the idea of NGI autonomy coined at the end of EGEE-III and promoted also by EGI. NGI_PL users submit jobs using vo.plgrid.pl and we would like to have Availability/Reliability (A/R) statistics for this VO. A next step forward would be to allow customization of the A/R computation algorithm in terms of (1) adding regional tests for regular EGI services. For example in NGI_PL we extended WMS monitoring for a couple of new functionalities and these probes we would like to make critical for WMS availability. Along with that extension goes ability to customize site availability by (2) manipulating critical services list e.g. by adding UI as service critical for a site (NGI_PL monitors UIs). Finally we would like to be able to modify A/R computation algorithm by (3) adding own regional service types.
Note: (2) overlaps with use case 4 below. (M.Radecki for NGI_PL)
Use case 4: Extension of the standard OPS site availability profile
KIT requested that new services (in addition to CE, SE and BDII) are included in availability computation, for example: WMS, LB, LFC, FTS, top-BDII, VOMS). In other words, the site requests that any local core services (that is independently operated from the NGI) can be considered in OPS availability reports.
As not all services necessarily need to be operated WMS, LB etc., if such optional services do not exist, the respective availability (in the site availability computation algorithm) should be 1.
Site is UP iff (CE is UP) AND (SE is UP) AND (Site BDII is UP) AND (WMS is UP) AND (LGC is UP) AND (VOMS is UP)