1. Data & Storage Services CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t DSS XROOTD news New release New features

2. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t 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 v20100115-1117 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

3. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t 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

4. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services DSS SE cleanup Now, the actual content of an SE can be compared to the information in the AliEn catalogue –It’s a very heavy maintenance operation, worth doing from time to time –From the SE side it’s 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

5. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t 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

6. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t 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

7. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services DSS Mailing list There’s 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

8. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t 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

9. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t 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’ user’s home –Stop the former, clean (eventually) stale ML-related processes –Start the new one Presentation Title - 9