1. 16/9/2004Features of the new CASTOR1 Alice offline week, 16/9/2004 Olof Bärring, CERN

2. 16/9/2004Features of the new CASTOR2 Outline The new stager –architecture –hybrid solution for the ALICE online MDC –status and deployment Features for the ALICE online MDC Features for ALICE physics MDC

3. 16/9/2004Features of the new CASTOR3 Tape mover (RTCOPY) client daemon rfiod (disk mover) Garbage Collector New CASTOR Stager Architecture Migrator Application RFIO/stage API Request Handler Recaller LSF CASTOR tape archive components (VDQM, VMGR, RTCOPY) Disk cache rfiod (disk mover) Resource Management Interface Request repository and file catalogue (Oracle or MySQL) 3 rd party Policy Engine mvr cntl Authentication file system load monitoring Maui

4. 16/9/2004Features of the new CASTOR4 Tape mover (RTCOPY) client daemon rfiod (disk mover) Not ready for ALICE MDCs Application RFIO/stage API Request Handler LSF CASTOR tape archive components (VDQM, VMGR, RTCOPY) Disk cache rfiod (disk mover) Resource Management Interface Request repository and file catalogue (Oracle or MySQL) 3 rd party Policy Engine mvr cntl Authentication file system load monitoring Maui Garbage Collector Migrator Recaller

5. 16/9/2004Features of the new CASTOR5 Hybrid solution (online MDC) Three components not yet implemented –Garbage collector –Migrator –Recaller Hybrid solution –A slimmed version of today’s stgdaemon is used as the framework Interfaced with new request repository (but not the file catalogue) Old recaller/migrator have been interfaced with expert system for file system selection policies and request repository for submitting the tape requests to the RTCOPY client daemon

6. 16/9/2004Features of the new CASTOR6 stager_castor Migrator Recaller Tape mover (RTCOPY) client daemon rfiod (disk mover) ALICE MDC stager hybrid Application RFIO/stage API LSF CASTOR tape archive components (VDQM, VMGR, RTCOPY) Disk cache rfiod (disk mover) Resource Management Interface 3 rd party Policy Engine mvr cntl file system load monitoring Maui Today’s GC script stgdaemon Request Handler Request repository (Oracle or MySQL)

7. 16/9/2004Features of the new CASTOR7 Status and deployment The hybrid stager is ready for performance tests –minor problem with retry of failing tape requests remains to be solved (fixed last night?) For this years ALICE MDC there are two parallel setups forseen –development setup for testing out new features and fixing bugs on the fly –production setup where the MDC runs The parallel setups use independent oracle servers for their request catalogues

8. 16/9/2004Features of the new CASTOR8 Test setup lxs5010 rhserver lxs5011 rtcpclientd dlfserver (logging) lxs5012 stgdaemon rmmaster expertd moab (Maui) lxshare179d ORACLE lxshare027d Disk server rmnode rfiod rootd lxshare028d Disk server rmnode rfiod rootd lxshare030d Disk server rmnode rfiod rootd lxshare031d Disk server rmnode rfiod rootd lxshare032d Disk server rmnode rfiod rootd lxshare033d Disk server rmnode rfiod rootd lxshare034d Disk server rmnode rfiod rootd

9. 16/9/2004Features of the new CASTOR9 Features for ALICE MDC Dynamic migration streams –New migration candidates can be added to an already running stream –In principle a stream could run forever... Migration candidate is decided just-in-time –The next file to migrate is selected when the tape mover is ready to receive the data Throttling –Using LSF or Maui allows for throttling when the system is completely loaded rootd (and later xrootd) is the disk mover serving the client

10. 16/9/2004Features of the new CASTOR10 Features for offline MDCs Throttling –Using LSF or Maui allows for throttling when the system is completely loaded File catalogue in Oracle will remove the old stgdaemon limit on ~200-500k entries rootd (and later xrootd) is the disk mover serving the client Disk-to-disk replication of “hot” files Full-fledged policy system for GC, recalls and migrations Remaining issue: what to do with tape performance for small files?