Overview

This page documents the policy to request re-computation of SAM availabilities results for WLCG and EGI. Current policy was approved on 14/02/2012.

Problems affecting the monitoring infrastructure may incorrectly impact the availability results for a given site during a period of time. When these issues are confirmed the test results must be verified or sometimes updated. The availability results are then re-computed so that availability numbers are not affected by the monitoring infrastructure fault.

Conditions to request a re-computation

Requests for re-computation are only accepted:

• When failures are due to problems in the monitoring infrastructure (invalid proxy certificate, problems in SE used for replica tests, etc);
• When reported up to 10 calendar days after the announcement of the reports of a given month, which normally occurs on 1st of the following month.

Below are some examples to better explain the conditions above:

• Example 1
  • On 25-Jan-2012 region A requests the re-computation of the region availability due to a hardware problem on SAM-Nagios which happend on 15-Jan-2012.
  • The request is approved. The justification of the problem is valid and the request was reported on time (before the announcement of the report).
• Example 2
  • On 05-Feb-2012 site B requests the re-computation of the site availability due to a problem with the host certificate of SAM-Nagios which happend on 15-Jan-2012.
  • The request is approved. The justification of the problem is valid and the problem was reported on time (5 days after the announcement of the first report).
• Example 3
  • On 20-Feb-2012 region C requests the re-computation of the region availability due to a network problem on SAM-Nagios which happend on 15-Jan-2012.
  • The request is rejected. The problem was reported too late (more then 10 days after the announcement of the first report).

How to request a re-computation

Confirm that the availability of your site/region is affected by browsing the MyWLCG/MyEGI service availability interface and open a new GGUS ticket:

• OPS VO: For EGI sites and regions, please assign the ticket as described in EGI PROC10;
• OPS VO: For OSG sites, please assign the ticket to SAM/Nagios Support Unit (3rd level experts).
• HEP VOS: For WLCG sites, please assign the ticket to SAM/Nagios Support Unit (3rd level experts).

The GGUS ticket must include the following information:

• A description of the problem;
• The site or ROC/NGI affected by the problem;
• The start and end time of the problem (yyyy-mm-ddThh:mm in UTC);
• The VO affected by the problem;
• A link to MyWLCG/MyEGI pointing to the problem.

How to follow a re-computation

The deadline for requesting re-computations is 10 calendar days after the announcement of the reports for a given month. Assuming the reports are announced on the 1st of the following month, the deadline for requesting re-computations will be the 11th of that month. As soon as the re-computation is complete the GGUS ticket is closed and the submitter notified. The MyWLCG/MyEGI service availability interface can be used to confirm the new availability numbers. The final report will be published shortly after the deadline.

If there are no requests for re-computation the first reports published at the beginning of the month are considered final reports. In any case, after the deadline, no further requests will be considered.