xrootd: Extended Features Supplement

Cache File System Support

MPS Reference

Andrew Hanushevsky

Stanford Linear Accelerator Center

2-October-2006

Acknowledgments

The MPS system was designed by Andrew Hanushevsky and Bill Weeks

mps_MigrPurg and mps_PreStage were designed and developed by Bill Weeks

mps_Stage and mps_Xeq were designed and developed by Andrew Hanushevsky

mps_prep was designed by Andrew Hanushevsky and developed by Bill Weeks

All work was done for Stanford University under contract DE-AC03-76-SFO0515 with the Department of Energy

1 Introduction. 5

1.1 MPS Components 5

1.2 Related Components 7

2 mps_MigrPurg Command for Migration. 9

2.1 Modifying Migrate Policy via Priority Requests 12

3 mps_MigrPurg Command for Purging. 15

3.1 Modifying Purge Policy With Pin Files 20

3.2 Modifying Purge Policy via Priority Purge 20

4 mps_PreStage Command. 21

4.1 The mps_prep Command for the Prestage Queue 25

4.1.1 The Pre-Stage Request Queue. 29

5 mps_Stage Command. 31

6 mps_Xeq Command. 37

7 MPS Configuration. 43

7.1 Common Configuration Directives