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Enhancing Disk Pool Management: Goals and Developments from the DPM Team

The Disk Pool Manager (DPM) team, represented by Ricardo Rocha, is committed to simplifying user and administrator experiences, improving performance, and enhancing feature sets through standard protocols like HTTP/WebDAV and pNFS. Ongoing developments include deploying solutions based on Apache, extensive testing at ASGC, and integration of credential delegation techniques. The team is also focused on dynamic federations and the exploration of loosely coupled catalogs. Join our efforts and workshops to prepare for the future with innovative storage technologies.

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Enhancing Disk Pool Management: Goals and Developments from the DPM Team

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  1. Disk Pool Manager Ricardo Rocha ( on behalf of the DPM team )

  2. Goals • Simplify life of users • Simplify life of administrators • Improve feature set and performance • Standard protocols ( HTTP / WebDAV, pNFS ) • Standard building blocks • Prepare for what is coming

  3. Consolidation • HTTP / WebDAV • Based on Apache 2 • Deployed at several sites (beta) • Extensively tested at ASGC with good results • Third party copies, multiple streams, credential delegation • NFS 4.1 / pNFS • Based on Ganesha • Deployed at several sites (beta) • Tests ongoing at ASGC, trickier to get all right • XROOTD • Rewriting the plugin, committed to do it fast • HTTPS for SRM (client SSL session reuse) • Nagios, Puppet, Catalog Synchronization https://svnweb.cern.ch/trac/lcgdm/wiki/Dpm/Dev/Components

  4. Global Access Service • Based on HTTP / WebDAV • Looking into doing the same with pNFS • Working prototype with LFC and DPM • Support in dCache being added soon • Standard HTTP clients • Magic comes with HTTP redirection • SEs redirect to next replica on failure • (transparent to the client) • Clients can be redirected back to the LFC • (on PUT or to get more replicas) 1 LFC 4 2 SE A 3 SE B … … https://indico.cern.ch/contributionDisplay.py?sessionId=1&contribId=65&confId=147484

  5. Dynamic federations • Extending the concepts described before • Loosely coupled catalogs and metadata • Multiple LFC catalogs • Private catalogs • No catalogs ( plain HTTP / DAV SE endpoints ) • Design ongoing, exploratory developments starting

  6. Preparing the future • Significant code refactoring almost finished • Separation between namespace and pool management • DMLITE based on a plugin stack • NS: MySQL, Oracle, memcache, DynFederation, … • POOL: Native DPM, HADOOP, S3, CEPH, … • Extending DPM to other storage technologies WEBDAV NS DMLITE pNFS POOL NATIVE DPM XROOTD CLOUD (S3, …) HADOOP …

  7. DPM Community Workshop • Join us! • 27th February 2012 - CERN • https://indico.cern.ch/events.py?tag=dpm-community-workshop-2012

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