UM D 0 RACE STATION Status Report Chunhui
- Slides: 8
UM D 0 RACE STATION Status Report Chunhui Han June 20, 2002
UM d 0 race system overview • Machine name: dzero. physics. lsa. umich. edu • System admins: Bing Zhou, Qichun Xu • Phase 0: Running Red. Hat Linux, Kernel 2. 4. 9 • Phase I: ROOT 3. 02/07 installed • Phase II: D 0 Run. II software releases installed qp 10. 14. 00 qp 11. 05. 00 qp 11. 06. 00 • Phase III: CVS access, KAI compiler available • Phase IV: Running SAM station (station name: umdzero)
Kerberos System Kerberos system installed in dzero machine necessary for checking out packages from CVS. I use ‘kinit –f ‘ to obtain a forwardable Kerberos principal, and then am able to telnet directly to d 0 mino , and DØ Linux Build machines, but not to Clue. D 0 nodes.
Installing SAM Problems during initial set-up: Installation: (by Bing) followed the instructions on the web After installation: cannot retrieve files from SAM. But I can do other tasks: locate files, define dataset, etc. Solution: Reinstalling SAM a couple of times did not help. I emailed sam-admins. A project disk for umdzero was set up in d 0 mino. Problem solved.
Using SAM station configuration: q. SAM external delivery: constrained to d 0 mino. fnal. gov q quotas: projects = 4; disk: 1 GB q authorized groups: dzero I mainly use umdzero SAM system to retrieve MC data files (reco output, rootuples) stored by physics groups. But due to some problems, I mostly retrieve files on d 0 mino, and then ftp to dzero for analysis. I did not test retrieving files from umdzero cache to d 0 mino.
Using SAM (2) File delivery problems: Quite often the system hangs after delivering several data files. Is it because the transfer is slow or any problem with the sytem? When the system stops delivering files, the project will remain indefinitely in the system, saturating the project quota. I have to manually remove a project. --> anyway to time-out a project automatically if it hangs too long?
Using DØ software I mostly use the d 0 race machine to run MC generations, simulations, and reconstructions. No problem compiling and running DØ software packages. No problem updating changes to DØ packages into CVS. Setting up DØ products: Can setup most of the DØ products, but cannot “setup d 0 tools”. Currently batch system is not installed, so large jobs are run directly from the shell window.
Final Words Umdzero is helpful to use for data analysis: • reasonable CPU power and storage space is accessed by relatively few users. • The system is quite stable so far. • A couple of Linux machines are clustered to umdzero. • Easy installation of DØ software releases. But how to uninstall a DØ software release?
