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Xrootd Redux

Xrootd Redux. Wahid Bhimji University of Edinburgh,. Redux …. “I probably wouldn’t invest time in looking at DPM/ dCache+xrootd .” G. Cowan HEPSYSMAN June 06 “Unless the experiments really say that they want it.”. Redux ?. Experiments: ALICE always have used it

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Xrootd Redux

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  1. XrootdRedux Wahid Bhimji University of Edinburgh, Wahid Bhimji – Files access

  2. Redux… • “I probably wouldn’t invest time in looking at DPM/dCache+xrootd.” • G. Cowan HEPSYSMAN June 06 • “Unless the experiments really say that they want it.” Wahid Bhimji – Files access

  3. Redux ? Experiments: • ALICE always have used it • ATLAS like the sound of the redirector • CMS have jobs streaming over the WAN with it Other: • CERNs new disk-only CASTOR replacement EOS is based on it • Widespread use and backing of SCALA in US Wahid Bhimji – Files access

  4. What is it? • Andy’s Xroot Intro….. Wahid Bhimji – Files access

  5. Installing on DPM https://twiki.cern.ch/twiki/bin/view/LCG/DpmXrootAccess22 • DPM_XROOTD="yes” in YAIM • Main configat /opt/lcg/etc/xrd.dpm.cf /sbin/service dpm-xrd start /sbin/service dpm-cms start /sbin/service dpm-manager-cms start # head node only /sbin/service dpm-manager-xrd start # head node only Check that in /etc/shift.conf: DPM PROTOCOLS rfiogsiftp https xroot Open ports 1094 / 1095 Wahid Bhimji – Files access

  6. Performance / Test • Xrdcp • Root / Athena reading Wahid Bhimji – Files access

  7. EOS When 25 filesystems just isn’t enough Wahid Bhimji – Files access

  8. Why EOS • CASTOR is not popular • People now want disk only solutions • There are plenty of existing choices • So CERN decided to build another • Sounds stupid but then why not • Builds on existing technology (xrootd) • Customised for HEP use (ROOT, file based replication, strong authentication) Wahid Bhimji – Files access

  9. But anecdotally… • Always seems broken when I’m on shift…. • They have some heavy hardware so performance not directly comparable • Not POSIX – though FUSE planned • Noone outside CERN using it (that I know) BUT • Not likely to go away… maybe we should try it Wahid Bhimji – Files access

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