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Alternate paths -- USA report

Alternate paths -- USA report. D. Petravick Sept 12, 2006. Definitions. Backup -- Alternate capability that is at the ready. Expected scenarios Tested, Automated. Contingency -- Alternate capability, which is available to cope with the unexpected. Perhaps thought-tested in a few scenarios.

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Alternate paths -- USA report

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  1. Alternate paths -- USA report D. Petravick Sept 12, 2006 DLP -- Cambridge

  2. Definitions • Backup -- Alternate capability that is at the ready. • Expected scenarios • Tested, Automated. • Contingency -- Alternate capability, which is available to cope with the unexpected. • Perhaps thought-tested in a few scenarios. DLP -- Cambridge

  3. Backup links in US Context • OPN is one component of LHC networking. Provides: • Sole means for T0 -> T1 • Excess Capacity Available for T1 -> T1 • Primarily Provisioned by USLHCNET • Other LHC provisioning is Primarily Esnet/GEANT/I2. (yet more T1->T1, *->T2, T2 ->*, others) DLP -- Cambridge

  4. Link Backup within USLHCNET • USLHCNET • currently has one Trans Atlanic link. • will soon have three links, and equipment to failover at layer 1. • The assumption are that, given a shortage of internal resources USLHCNET will: • Treat Atlas and CMS equally. • Respect the experiments articulation of their priorities. CMS’s priorities are: • 1) T0 ingest, 2) other production, 3) other. • These are assumptions, not, say MOU items. Afikt. DLP -- Cambridge

  5. The larger networking US picture • CMS relies on routed network for its very significant GLOBAL T1-T2 Transfers. • Any T2 can download data from Any T1. • The T1 at Fermilab is quite large. • European T2’s have pledged the greatest amt of CPU. • Routed networks are the obvious candidate to make up for a shortfall of T1 T1 bandwidth. DLP -- Cambridge

  6. Other TA resources • TA resources with an identified Role: • USLHCNET • GEANT resources • A few paths to Russia • There are a number of other TA links. • Utilization levels indicate they may be available. • Surfnet has 2 links to Chicago and 2 to NY. • Fermilab has successfully used research links to the benefit of the its Run II experiments. DLP -- Cambridge

  7. Given a shortage of capacity • The current notion is that “scavenger service” in ESnet/GEANT used for OPN services. • If invoked, inverted priorities possible! • T0-T1 would be scavenger • adhoc data transfers primary • The best implementation would be • Fair to both CMS and ATLAS • Implement their priorities across all provisioning. • It’s evident this is ambitious and requires forethought. DLP -- Cambridge

  8. One more requirement -- Integrated backup and contingency • US Contingency and backup has to integrate with Intra-Europe Contingency and Backup. • I understand this to be “Cross Border Fiber” DLP -- Cambridge

  9. “box” level backup • Detailed analysis. • There are single points of failure, for example in Chicago. DLP -- Cambridge

  10. Discussion points • Identify concepts for TA OPN backup/contingency. • Do VLANS on Esent/GEANT help? • Where are the interchange points to integrated to Intra-Europe? • What should we Implement and test? • What work on contingency? DLP -- Cambridge

  11. Failover needs continual assessment • To ensure that the capability is avialbale when needed. DLP -- Cambridge

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