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Disk Pool Manager

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

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Disk Pool Manager

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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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