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Resource Centres OLA and Resource infrastructure Provider OLA reports

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Is is mandatory that EGI certified Resource Centres provide a minimum monthly availability and reliability as specified below (see the site-NGI Operational Level Agreement for details). Availability and reliability statistics (based on the global OPS VO) are issued on a monthly basis.

minimum availability 70%
minimum reliabilty 75%
Condition for suspension Resource Centres which have an availability of less than 70% for three consecutive months will be suspended, i.e. removed from the production infrastructure. This will change to 70% from PY2 (May 2011 reports). Note. This suspension policy was reviewed in April 2011, and the original 50% threshold was increased to 70%.
Condition for justification Resource Centres not providing minimum monthly performance (70% availability, 75% reliability) MUST provide justification through a GGUS ticket.

Performance

  • Overview of availability and reliability statistics including suspended sites
  • List of sites for which availability followup procedures were not applicable

2011

May Apr Mar Feb Jan

2010

EGI-wide Availability and Reliability

It is available here (overall xls file from May 01 2010)

Report generator

Process for quality verification

  • Generation of statistics

Availability and reliability statistics are automatically generated the first week of the month by GridView in pdf format and placed under [1]. An Excel version is available at [2]

  • Preliminary processing

Once the reports are generated, sanity checks are performed by EGI SA1 (Task TSA1.8). After this step is completed, statistics are uploaded into the EGI document server. Links to monthly statistics will be provided on a regular basis at this wiki page.

  • Publication

An announcement of the new results is distributed by EGI SA1 (TSA1.8) to the NGI Operations Managers mailing list. COD (TSA1.7) is responsible of supervising statistics by chasing NGIs to chase sites that need to provide comments in case thresholds are not met, and identifies sites eligible for suspension. This phase starts by filing a ticket to the COD Support Unit. The overall comments gathering process is handled through tickets.

  • Handling of sites below targets

For a site that misses availability/reliability targets but is not eligible for suspension:

  1. a child ticket is opened by the COD team and assigned to the respective NGI, asking for explanation to be given
  2. the explanation must be produced within 10 working days since the ticket is received by the site (please see known issues section [3]). Reminders and escalation is performed in accordance to COD escalation procedures [4].
  3. if the explanation is found satisfactory the ticket is closed
  4. conversely if the explanation is not given in due time, or the explanation is found inadequate, COD escalation procedure will be followed [5], with the site being suspended if neither site or NGI reply to the ticket
  5. the child ticket can then be closed
  6. the parent ticket will be closed when all child tickets have been closed.
  • Handling of sites that are eligible for suspension

For a site that is eligible for suspension:

  1. a child ticket is opened by the COD team assigned to appropriate NGI, notifying that the site will be suspended within 10 working days (please see known issues section [6])
  2. after the 10 days period passes during which normal COD escalation procedures apply [7], the site is suspended by COD unless the NGI has intervened or the EGI Chief Operations officer objects.
  3. in the case of NGI intervention, non suspension will occur if both the COD and COO agree on the reasoning provided by the NGI
  4. the child ticket closes either when the site is suspended or when suspension is canceled
  5. the parent ticket will be closed when all child tickets have been closed
  • Wiki follow up page

Sites that fail to provide explanations justifying the failure to meet OLA targets, or the explanation is found inadequate, as well as sites that are suspended, will be recorded in a wiki page [8]

  • Impact for increase availability suspension threshold to 70%

There is a proposal to increase the threshold for suspesion to 70% for 3 consecutive months, from 50% that it is currently. The impact of this can be found at [9]

Known issues and recommendations to NGIs

  1. Gridview is always calculating reliability and reliability of a site as soon as it shows up in GOCDB and in the BDIIs, regardless of its certification status. While processing the data in order to generate the availability/reliability report, GridView takes into account the Certification status of the site at that moment in order to decide if the site is certified and as a result it will show up in the report, or if it uncertified and it has to be excluded. Thus newly certified sites will get inaccurate Availability/Reliability figures for the month they were certified and all months before that. Because the Certification status history is not currently available in the operations tools, until a solution is implemented NGIs should check if they have sites affected by this issue and report it as explanation. More information at [10] and [11]. As of December 2010, Gridview has included a snapshot feature so availability takes into account the topology at the last day of the month. While it does not solve the problem completely, it reduces its impact. Currently (January 2011) it is used for the pdf reports generator but not for the Excel ones.
  2. arcCE tests have been considered critical since mid July 2010, but sites and RODs are not getting notified in any operational tool about their results. This is being investigated, in the meantime sites/NGIs dealing with availability/reliability tickets caused by arcCE issues, are advised to solve such tickets mentioning that this was due to the arcCE in the solution. Some background [12] and [13]
  3. creamCE tests are critical but not taken into account for availability/reliability calculations. This was discussed on various occasions, more recently into the OMB 26 October: [14]
  4. The calculations performed by gridview always take into account the information system status and gocdb information at the time the calculation is performed, and not that of a certain checkpoint in the past. The implication of this is that any complete recalculation has the risk of altering the results for sites that had correct numbers in the first place. Thus until a solution is found, complete recalculations are avoided whenever possible, and errors are fixed on per site basis for those that have lower number than they should.
  5. Weighted availability is calculated by multiplying the number of logical CPUs a site published with the published HEPSPEC value. It is important that these numbers are correct, if HEPSPEC for a site is too high or too low (for example in case of mistake) the overall NGI wighted availability will be affected.

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