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Future Proof S torage with DPM

Future Proof S torage with DPM. Oliver Keeble (on behalf of the CERN IT-GT-DMS section). DPM today. Disk storage for the grid 36PB 10 sites with > 1PB Over 200 sites in 50 regions Over 300 VOs have access to DPMs. DPM today. Current production version is 1.8.3

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Future Proof S torage with DPM

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  1. Future Proof Storage with DPM Oliver Keeble (on behalf of the CERN IT-GT-DMS section)

  2. DPM today • Disk storage for the grid • 36PB • 10 sites with > 1PB • Over 200 sites in 50 regions • Over 300 VOs have access to DPMs Future Proof Storage with DPM, EGI TF Prague

  3. DPM today • Current production version is 1.8.3 • https://svnweb.cern.ch/trac/lcgdm/blog/official-release-lcgdm-183 • In EPEL, EMI1 and EMI2 • No gLite – see tutorial on Wed on how to upgrade • What’s new • EPEL compliance • HTTP/DAV frontend (old dpmhttpd is gone) • NFSv4.1 frontend (read only) • Thread safe clients • Synchronous get requests • … Future Proof Storage with DPM, EGI TF Prague

  4. 1.8.4 • Next core release: 1.8.4 • First DMLITE release (see later…) • DAV frontend will start using the new libraries • Other components not using dmlite for now • Improved replication mechanism • 32bit client support • Lots of other small fixes • Feature complete… finishing certification • Change in the release process • Independent component releases • Faster, lighter releases Future Proof Storage with DPM, EGI TF Prague

  5. Refactoring & DMLITE • DMLITE is the result of a significant refactoring effort to make DPM modular • Better separation between frontends and backend • Cleaner, more open, much improved performance • Improved integration with standard building blocks • Hadoop, Memcache, S3, Lustre, … Future Proof Storage with DPM, EGI TF Prague

  6. Improved Frontends • Standard protocols, standard clients • HTTP/DAV • + extras, WAN transfers, 3rd party copy… • NFS 4.1/pNFS (r/o) • Xrootd (rewritten) • Forthcoming • GridFTP • Legacy interfaces remain untouched • No large scale revalidation required Future Proof Storage with DPM, EGI TF Prague

  7. Improved Frontends • Standard protocols, standard clients • HTTP/DAV • + extras, WAN transfers, 3rd party copy… • NFS 4.1/pNFS (r/o) • Xrootd (rewritten) • Forthcoming • GridFTP • Ubiquitous access to grid storage • Legacy interfaces remain untouched • No large scale revalidation required Future Proof Storage with DPM, EGI TF Prague

  8. Improved Backends • This is where DMLITE shines • Plugin based, open for constant evolution • Improved nameserver performance • Connection pooling, improved SQL, memcache layer, … • Support for multiple pool types • Legacy DPM, Hadoop/HDFS, S3, … • Sharing a single namespace if desired • Possibility for opportunistic pools • Federation • See the following presentation • And this is the beginning, much more coming • Python bindings, Lustre, VFS, … Future Proof Storage with DPM, EGI TF Prague

  9. Improved Backends • This is where DMLITE shines • Plugin based, open for constant evolution • Improved nameserver performance • Connection pooling, improved SQL, memcache layer, … • Support for multiple pool types • Legacy DPM, Hadoop/HDFS, S3, … • Sharing a single namespace if desired • Possibility for opportunistic pools • Federation • See the following presentation • And this is the beginning, much more coming • Python bindings, Lustre, VFS, … Future Proof Storage with DPM, EGI TF Prague

  10. I/O performance PRELIMINARY PRELIMINARY PRELIMINARY Future Proof Storage with DPM, EGI TF Prague

  11. Performance, performance, performance https://cdsweb.cern.ch/record/1458022?ln=en Future Proof Storage with DPM, EGI TF Prague

  12. Easy administration • Puppet for configuration • Popular among large data centers • Lots of modules for popular tools (which we now rely on – apache, memcache, nagios, …) • Nagios for monitoring • We reuse as much as possible • And there’s a lot already available • Added specific plugins for detailed status and performance monitoring Future Proof Storage with DPM, EGI TF Prague

  13. Easy administration • Puppet for configuration • Popular among large data centers • Lots of modules for popular tools (which we now rely on – apache, memcache, nagios, …) • Nagios for monitoring • We reuse as much as possible • And there’s a lot already available • Added specific plugins for detailed status and performance monitoring Future Proof Storage with DPM, EGI TF Prague

  14. Why “future proof”? • Standards • Leverage existing components & clients • Mature ecosystem • Less maintenance work • Community • Guidance by the stakeholders • Independence from funding cycles • Now in talks for the creation of a “DPM Collaboration” to drive the project post-EMI Future Proof Storage with DPM, EGI TF Prague

  15. The DPM Collaboration • DPM is the most numerous SE on the WLCG infrastructure • The project has never been in better shape • We are soliciting statements of support for a collaboration • In discussions with • GridPP (UK) • WLCG France • Taipei (WLCG Tier 1 using DPM) Future Proof Storage with DPM, EGI TF Prague

  16. DPM around the world Future Proof Storage with DPM, EGI TF Prague

  17. Summary • DPM has received a lot of investment thanks to EMI • These developments are now being released • This investment has gone into • Making it modular • Supporting standards (HTTP, NFSv4.1,…) • Profiting from existing technology • Performance • Manageability Future Proof Storage with DPM, EGI TF Prague

  18. Recent Issues • Issue with LFC API / Py26 (#84716) • Tracked down to issue with EPEL5 Swig version • Currently considering the best solution • Cleaning up invalid LFC replicas (#83335) • Solved… bulk requests using API/CLI tools • DAV EMI2 install failure (#85141) • Related to dependencies on gridsite, solved with the EPEL update • EMI2 LFC dies regularly (#85161) • Happens to any of lfc/dpm/dpns daemons • Documented as a known issue with 1.8.3 • https://svnweb.cern.ch/trac/lcgdm/blog/official-release-lcgdm-183 • 32 bit support (#81508) • Available in EMI2 and EPEL repositories Future Proof Storage with DPM, EGI TF Prague

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