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Xrootd Monitoring and Control

Xrootd Monitoring and Control. Harsh Arora CERN. Setting Up Service. Monalisa Service Monalisa Repository Test Xrootd Server ApMon Module. Collecting Xrootd Parameters. Monalisa Service. Control Xrootd Services. Sends monitoring data. System/ Network Info. Xrootd. External

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Xrootd Monitoring and Control

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  1. Xrootd Monitoring andControl Harsh Arora CERN

  2. Setting Up Service • Monalisa Service • Monalisa Repository • Test Xrootd Server • ApMon Module

  3. Collecting Xrootd Parameters Monalisa Service Control Xrootd Services Sends monitoring data System/ Network Info Xrootd External Storage

  4. XROOTD SERVER XROOTD SERVER XROOTD SERVER ApMon ApMon ApMon MonALISA MonALISA MonALISA Proposed Architecture to Monitoring & Control the Xrootd in ALICE Control Module Control Module Network Monitoring System Monitoring Network Monitoring System Monitoring Control / Update Aggregated Data Control Module MonaLisa Xrootd Repository Alerts Network Monitoring Actions System Monitoring Long History DB Iosif Legrand June 2012

  5. Proposed Architecture to Monitoring & Control the Xrootd in ALICE Iosif Legrand June 2012 • Run a MonALISA service on each host running an XROOTD server ( a new dedicated group ) • Control the xrootd server • Start / Stop / Update • Dynamically Change conf parameters • Collect Monitoring information from the xrootd servers using the new & improved monitoring functionality from xrootd • Perform full network measurements and tests (RTT , available bandwidth, topology ) • Monitor the storage system used by xrootd servers • Create a dedicated MonALISA repository

  6. Active Available Bandwidth measurements between all the ALICE grid sites (2) ALICE measurements between all VO Boxes Important to have similar Data for Xrootd servers Iosif Legrand October 2010 6 Iosif Legrand June 2012

  7. Advantages of Using a dedicated MonALISA group to monitor and control all the XROOTD servers • Easy to maintain and update a critical service for Offline computing • Significantly improve the monitoring information and will help to better understand the way storage system are used in the ALICE Computing model (Distributed Storage for Data) • Control the xrootd servers and can dynamically configure systems based on how they are used. • Monitor the true network connectivity • Monitor the real storage used by xrootd servers • Monitor the connection and transfer per client / job • Can really help in developing optimization procedures for complex data flows Iosif Legrand June 2012

  8. % of CPU Used by Monalisa

  9. ParametersCollection and Verification

  10. % of time spent by CPU in User Mode Monalisa Host Monitoring Reported by Xrootd

  11. Parameters Srv_rd_mbytes Open_files Srv_wr_files

  12. Parameters(Cont.) Srv_rd_files Srv_wr_mbytes Space_free

  13. Average Load over last 15 min. Load15

  14. Ambiguous Parameters • Connected Clients • Number of Jobs Requiring a Thread

  15. Dedicated MLRepository

  16. Detailed Monitoring per Client • Monitoring per Client • Patch to xrootd-3.1.0

  17. Client Monitoring Example Number of Bytes

  18. Additional Information provided by monitoring each client from the xrootd server • Global Map of Data Transfers • Debug individual clients • Understand better the effect of long RTT

  19. Preparing Correlations Plots • Bad xrootd Server Detection • High CPU Usr with Low Disk Throughput • -ve correlation b/w Traffic and Disk IOUtil(%) • High Disk IOUtil(%) with Less Read Write Rate – Probably Damaged Disk • High Load Value with Less number of clients

  20. Monalisa on Each Server • Local CPU Monitoring Info • Understanding Network Topology • Traffic Information • Monitoring directly the storage system • Control

  21. Future Plan

  22. Control via Monalisa • Start/Stop xrootd server • Upgrade

  23. Problems • Latest version of xrootd-3.2.1 • Incompatible with xrootd-ftsofs-1.1.0

  24. Thank You

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