Data & Storage Services CERN IT Department CH-1211 Genve 23 Switzerlandt DSS XROOTD news New release New features CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS Presentation Title - 2 New bundled release A new production release is available since a few days (vmss_1.7) It contains the xrootd tag v Huge changelog available in the Savannah page See the download section https://savannah.cern.ch/projects/xrootd Main items: Data management Refinements for the Virtual Mass Storage 3 rd party copy available by default Space reporting in Monalisa CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS Data management Big improvements visible in the xrd command line interface Of course the server must support them Cluster-wide ls and recursive ls Now the output is what one should expect Query space It gives an approximation of the used/free space managed by the cluster A correct one if each server mounts a disjoint set of disks If you mount the same NAS to more than one server it will report more. Presentation Title - 3 CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS SE cleanup Now, the actual content of an SE can be compared to the information in the AliEn catalogue Its a very heavy maintenance operation, worth doing from time to time From the SE side its easy. Just compute the result of the recursive ls in / You have to sync with Latchezar/Pablo about the actions It was performed on ALICE::CERN::SE 1hr 50m for 5-6Mfiles Presentation Title - 4 CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS Bundle refinements The VMSS is more mature The native-XROOTD ALICE site federation through the Global Redirector Automatic fetch of absent files Much faster than before Automatic reporting to ML of the space information See the SE status page Automatic reporting to ML of the server version Easy to spot old ones from now on Presentation Title - 5 CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS The 3 rd party copy Same plugin as CASTOR (by A.Peters) Authenticated Push mode for files Files are pushed directly server->server The push is triggered by the command xrd3cp Not included in the server bundle No config needed, it works out of the box Presentation Title - 6 CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS Mailing list Theres a new CERN-centric mailing list Used for announces about tags/versions XROOTD-announce.cern.ch Everybody is invited Not much traffic is foreseen Presentation Title - 7 CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS The Global redirector Remarkable stability, it never needs restarts It will soon reach the first limit of 64 native xrootd sites in the same federation A solution for this is in development Will allow the aggregation of up to 256 sites No need to touch it now But a check about the sites list will be performed Completely transparent Some sites need to be refurbished Old versions, not supporting it very well A few of them also look unstable More news after the round of checks Presentation Title - 8 CERN IT Department CH-1211 Genve 23 Switzerlandt Internet Services DSS Upgrade! Upgrading is highly recommended Usual steps, usual Alien Howto http://alien.cern.ch/twiki/bin/view/AliEn/HowToInstallXrootd Newhttp://alien.cern.ch/twiki/bin/view/AliEn/HowToInstallXrootd New Better not to copy the old system.cnf Copy the (few) values manually Better not as root, do a parallel normal installation In a parallel directory in the xrootd users home Stop the former, clean (eventually) stale ML-related processes Start the new one Presentation Title - 9