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During the September US analysis jamboree, users almost brought down our entire storage system because of a bug in the root package bundled in ATLAS releases. I believe that is the cause of lower reliability. This only happens are SLAC because we are the only one experimenting directly xrootd reading (other sites copy file to batch nodes first). With the help of Andy H., and folks at CERN and BNL, we found the reason and a workaround. We also asked all our local users to use this workaround to prevent similar situation. https://hypernews.cern.ch/HyperNews/Atlas/get/SLACNonGridJobs/111.html We believe the bug has been fixed in root >=5.20 and we hope future ATLAS releases will bundle that one. Wei Yang | [log in to unmask] | 650-926-3338(O) > From: "Young, Charles C." <[log in to unmask]> > Date: Thu, 16 Oct 2008 22:55:04 -0700 > To: "Yang, Wei" <[log in to unmask]>, atlas-sccs-planning-l > <[log in to unmask]> > Subject: RE: September 2008 - Tier-2 Reliability and Availability Report > > We seem to have gotten a little worse :-( Any idea what caused it? > > -- > Charles C. Young > M.S. 43, Stanford Linear Accelerator Center > P.O. Box 20450 > Stanford, CA 94309 > [log in to unmask] > voice (650) 926 2669 > fax (650) 926 2923 > CERN GSM +41 76 487 2069 > >> -----Original Message----- >> From: [log in to unmask] >> [mailto:[log in to unmask]] On >> Behalf Of Wei Yang >> Sent: Thursday, October 16, 2008 9:13 PM >> To: atlas-sccs-planning-l >> Subject: FW: September 2008 - Tier-2 Reliability and >> Availability Report >> >> ------ Forwarded Message >> From: Lcg Office <[log in to unmask]> >> Date: Thu, 16 Oct 2008 10:14:19 +0200 >> To: "project-wlcg-cb (Members of the WLCG CB)" >> <[log in to unmask]> >> Cc: "project-lcg-gdb (LCG - Grid Deployment Board)" >> <[log in to unmask]> >> Subject: September 2008 - Tier-2 Reliability and Availability Report >> >> Dear Collaboration Board Members, >> >> Please find below the draft WLCG Reliability and Availability >> Report for the >> Tier-2 sites for last month. And send your comments and >> corrections to [log in to unmask] before Tuesday 21 October 2008. >> >> The report will then be published on the WLCG planning page >> and reported to the WLCG Overview Board. >> >> https://twiki.cern.ch/twiki/bin/viewfile/LCG/SamMbReports?file >> name=tier2_rel >> _sep2008.pdf >> >> Best regards. >> Alberto Aimar, LCG Office >> >> >> ------ End of Forwarded Message >> >>