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perfSONAR: getting telemetry on your network
The document discusses the Worldwide Large Hadron Collider Computing Grid (WLCG) and its collaborative structure for data management and analysis. It highlights the importance of the perfSONAR network monitoring tool for ensuring reliable network performance across various sites, including the configuration and visualization of data transfer. Current efforts include promoting IPv6 adoption and enhancing network diagnostics through projects like Pundit to improve fault detection and monitoring capabilities.
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perfSONAR: getting telemetry on your network
- 1. Duncan Rand, Jiscand Imperial College London perfSONAR: getting telemetry on your network
- 2. WLCG/GridPP as anexample community 19 Oct 2016 » TheWorldwide Large Hadron Collider Computing Grid (WLCG) is a global collaboration of more than 170 computing centres in 42 countries » Its mission is to provide global computing resources to store, distribute and analyse the ~30 petabytes of data generated per year by the LHC experiments » GridPP is a collaboration providing data-intensive distributed computing resources for the UK HEP community and the UK contribution to theWLCG » Hierarchically arranged with four tiers: › Tier-0 at CERN (andWigner in Hungary) › 13Tier-1s (mainly national physics laboratories) › 149Tier-2s (generally university physics laboratories) › Tier-3s
- 3. 19 Oct 2016 »Initial modelling of LHC computing requirements suggested a hierarchical tier-based data management and transfer model » Data exported fromTier-0 at CERN to eachTier-1 and then on toTier-2s » However better than expected network bandwidth means that the LHC experiments have been able to relax this hierarchy » Now data is transferred in an all-to-all mesh configuration » Data often transferred across multiple domains › e.g. a CMS transfer to Imperial College London might come predominately from Fermilab near Chicago along with other CMS sites » So good network is crucial to the operation of theWLCG and that means good monitoring
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- 5. perfSONAR 19 Oct 2016 »Networkmonitoring tool developed by ESnet, GEANT, Indiana University and Internet2 »'perfSONAR is a widely-deployed test and measurement infrastructure that is used by science networks and facilities around the world to monitor and ensure network performance.’ »'perfSONAR’s purpose is to aid in network diagnosis by allowing users to characterize and isolate problems. It provides measurements of network performance metrics over time as well as “on-demand” tests’ »http://www.perfsonar.net/about/what-is-perfsonar/
- 6. Worldwide perfSONAR hostlocations 19 Oct 2016
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- 14. Durham University GridPPsite 19 Oct 2016 Replaced perfSONAR host motherboard
- 15. Lancaster University GridPPsite 19 Oct 2016 “a number of major tweaks to our network configuration”
- 16. Oxford University GridPPsite 19 Oct 2016 Reconfiguration of site core network
- 17. MaDDash visualisation dashboard 19Oct 2016 »With large meshes it is difficult to check all hosts »Centralised dashboards really help visualise overall performance »MaDDash (Monitoring and Debugging Dashboard) displays meshes of perfSONAR hosts »Many examples of MaDDash dashboards, e.g. ICNRG, WLCG »WLCG dashboard has two aspects › Open Monitoring Distribution (Nagios monitoring) › MaDDash »http://psmad.grid.iu.edu/maddash-webui/
- 18. perfSONAR configuration interface 19Oct 2016 »A perfSONAR host can participate in multiple meshes »Configuration interface and auto-URL enables dynamic configuration of entire network McKee et al. CHEP2015
- 19. 19 Oct 2016 »Addingand removing hosts from the mesh configuration is very simple »Makes use of aWLCG database of hosts »Version of GUI developed by OSG to be included in perfSONAR toolkit
- 20. 19 Oct 2016 InitialWLCG meshes based around countries, e.g. UK/GridPP
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- 24. Dual-stack perfSONAR measurements 19Oct 2016 »IPv6 rollout is slow but steady »Assumption (hope) that future campus upgrades will include provision of IPv6 »perfSONAR supports IPv4 and IPv6 measurements »Can leave perfSONAR hosts to default to using IPv6 if it exists but then not always clear which is in use »Otherwise can force with "ipv6_only": "1” parameter
- 25. WLCG/HEPiX IPv6 WorkingGroups 19 Oct 2016 »TheWLCG has an ongoing effort to promote the adoption of IPv6 »Aim to be able to allow sites to offer IPv6-only computing resources to theWLCG by April 2017 »HEPiX/WLCG IPv6 working groups looking into issues »Developed mesh to track roll-out of IPv6 capable perfSONAR hosts within WLCG »Currently twenty oneWLCG perfSONAR dual-stack nodes are in the mesh
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- 28. Oxford Oct 2015 19Oct 2016 IPv4 ~ 5Gbps IPv6 ~ 0.5Gbps
- 29. Oxford Sept 2016 19Oct 2016 IPv4 ~ 1.3Gbps IPv6 ~1.3Gbps
- 30. Small perfSONAR nodeprojects 19 Oct 2016 »DataTransfer Zones need well-specified, dedicated hardware to run perfSONAR hosts »Requires some investment of time and money »Would be nice to have an easier way to get any idea of network performance »GÉANT have developed a small perfSONAR node using Gigabyte Brix devices costing about £150-200 each »Using these in a short but time-limited small perfSONAR node project »IPv6 included from the start GÉANT
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- 33. Small perfSONAR nodeprojects 19 Oct 2016 »Jisc would like to take this project forward »Will probably use existing image »Send out small perfSONAR node to users who wish to get a rapid and easy idea of their network performance »For example a scientist in a UK institute with slow download of data set from e.g. Diamond or Jasmin »Also plan to produce a UK mesh into which these small nodes could be added more or less temporarily »Training course on how to set up such a mesh being run by GEANT in Zurich on 4th November 2016 › https://eventr.geant.org/events/2496
- 34. Improving diagnostics: Pundit 19Oct 2016 »A large mesh such as those in use byWLCG contains a lot of useful data »Should be possible to use network tomography to, for example, identify problematic routers by correlating traceroute and performance data »PUNDIT project in US aimed at this »Additional executable installed on perfSONAR host »More details: http://pundit.gatech.edu and https://indico.cern.ch/event/505613/contributions/222742 8/
- 35. Summary 19 Oct 2016 »perfSONARis a valuable resource for characterising and diagnosing network performance »Bandwidth nodes typically record throughput and traceroute data; latency nodes record latency and loss »Network administrators should consider installing several at pertinent places, e.g. at the border, next to storage etc »Meshes together with MadDash dashboards allow relatively easy monitoring of groups of hosts »Future perfSONAR meshes should include IPv6 »Development work is ongoing to improve the automatic notification and diagnosis of network faults
- 36. 19 Oct 2016 »Thankyou »Duncan.Rand@jisc.ac.uk
Editor's Notes
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- #8 IP addresses IPv4 and v6
- #15 Problems with the perfsonar host itself
- #16 Sometimes the issue is with campus network. This took a long time to resolve
- #17 Another campus network problem
- #33 http://perfsonar-smallnodes.geant.org/maddash-webui/