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WLCG Prolonged Site Downtimes

WLCG Prolonged Site Downtimes. Towards A Common Strategy? Jamie.Shiers@cern.ch. Prolonged Site Downtimes . Can we agree on common timelines based on those proposed by CMS and EGI? EGI talks of: Up to 24 hours; Up to 72 hours; Up to 30 days. CMS timelines “similar” (next):.

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WLCG Prolonged Site Downtimes

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  1. WLCG Prolonged Site Downtimes Towards A Common Strategy? Jamie.Shiers@cern.ch

  2. Prolonged Site Downtimes • Can we agree on common timelines based on those proposed by CMS and EGI? • EGI talks of: • Up to 24 hours; • Up to 72 hours; • Up to 30 days. • CMS timelines “similar” (next):

  3. WLCG Timelines (proposal) • 1st 24 hours: site internal • Following 48 hours: 1st level escalation • Updates reported to WLCG operations meeting & GGUS tickets; • Formal notification to WLCG MB(?) [ IMHO yes ] • Up to 2 weeks: 2nd level escalation • “Recovery” (if appropriate) may still be an option (cf NL-T1 case) • N.B. 3rd level escalation may be triggered earlier if felt appropriate (e.g.if all reasonable options exhausted) • WLCG helps mediate choice of backup sites (inter-VO issues) • Beyond: 3rd level escalation • Recovery no longer appropriate(?) • Restoration of service is now top priority but may take a long time – e.g. in case of disaster • Incident reported to WLCG OB and CB

  4. Incidents Affecting Multiple Sites • They happen… • Need to agree action beforehand • Goal: minimize impact • A preventative downtime – even if it impacts data taking – may be strongly preferred to the alternatives (which could involve lengthy site re-installs and/or uncertainty about data security/integrity • Proposal: top priority upgrades not counted as site downtime • To be confirmed on a case-by-case basis

  5. Summary • We have had numerous prolongedand disruptivesite downtimes • We need a strategy for handling them • The proposed timelines are suggestions – they can be adjusted as necessary but not too much! • We should start handling such downtimes systematically now…

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