1. R.Starink Nikhef Amsterdam PDP/CT PDA Ronald Starink

2. R.Starink Nikhef Amsterdam PDP/CT

3. R.Starink Nikhef Amsterdam PDP/CT Grid Stable operations Real data: ◦ User analysis ◦ Experiment software releases → cvmfs: web-based file system

4. R.Starink Nikhef Amsterdam PDP/CT CERN VM file system (cvmfs)

5. R.Starink Nikhef Amsterdam PDP/CT cvmfs ☺ Performance ☺ Software installation procedure ☺ Latest releases @ Grid cluster, Stoomboot, desktops

6. R.Starink Nikhef Amsterdam PDP/CT Stoomboot Local batch cluster Popularity issues: ◦ Sometimes busy ◦ Slow data access

7. R.Starink Nikhef Amsterdam PDP/CT Stoomboot CPU Problem: peak usage ◦ Average usage 57% (Dec 2010-2011) ◦ Adjustments in scheduling

8. R.Starink Nikhef Amsterdam PDP/CT Tunnel Local batch cluster @ grid machines ◦ ~216 job slots ◦ No /home, /project, /data jobstime [10^6 hr] Stoomboot21331081.26 Tunnel3194900.93 319,49 0

9. R.Starink Nikhef Amsterdam PDP/CT

10. R.Starink Nikhef Amsterdam PDP/CT Data access Performance issues /data/* ◦ NFS doesn't scale well GlusterFS ◦ Scalable & extensible  Volume (PB) and performance ◦ Stoomboot: /glusterfs/atlas

11. R.Starink Nikhef Amsterdam PDP/CT

12. R.Starink Nikhef Amsterdam PDP/CT ?