1. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 1 History  Test system HPSS 3.2 installation in Oct 1997 IBM AIX machines with IBM 3590 drives Port of mover to Digital Unix then started mostly functionality testing, no unexpected problems/delays API - simple & slow, or complex & fast sequential, needs application changes  Modified existing CERN RFIO interface to use fast HPSS interface to profit from existing investment  Services started August 98 using HPSS 3.2

2. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 2 CERN files - where do they go?  AFS: small files up to 20MB home directories and some project files  HPSS: medium sized files > 20 MB, 20 MB, < 10 GB used to be on user-managed tapes! rfcp local-file hpsssrv1:/hpss/cern.ch/user/l/loginid/hpss-file stagein -M /hpss/cern.ch/user/l/login/hpss-file link-file hsm -x get /hpss/cern.ch/user/l/login/hpss-file local-file “Transparent” to Objectivity DB users using modified SLAC AMS/HPSS interface  HPSS: Data taking for some experiments and test beams performance and reliability are very important files often go into the wrong COS

3. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 3 Production hardware HPSS 3.2  IBM F50 RS/6000 main server (ns, bfs, etc.) 512 MB RAM, 2 cpus, AIX 4.2.1.0 Fastethernet  2 IBM F50 RS/6000, disk & tape server 256 MB RAM, 2 cpus, AIX 4.2.1.0 2 IBM 3590 drives, 10 GB cartridges 4 x 7 x 18 GB disks mirrored 344 GB total space in HPSS storage class 1 114 GB total space in HPSS storage class 4 (2 tape copies) HIPPI & Gigabit  2 COMPAQ Alpha 4100, disk & tape server 512 MB RAM, 4 cpus, Digital unix 4.0D 2 STK Redwood drives, 10GB, 25GB, 50B cartridges 2 x 7 x 18 GB disks mirrored 240 GB total space in HPSS storage class 2 HIPPI & Gigabit

4. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 4 Network HPSSSRV1 HPSS server HPSS1D02 HPSS disk & tape Mover SHD56 HPSS disk & tape Mover Hippi Fast Ethernet SHD55 HPSS disk & tape Mover Gigabit Hippi Gigabit IBM RS/6000 F50 DEC AlphaServer 4100 Client Any Platform Fast Ethernet Hippi Chorus, NA57, etc... HPSS1D01 HPSS disk & tape Mover IBM RS/6000 F50 Gigabit Hippi Gigabit Hippi

5. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 5 HPSS Performance IBM F50 mirror Ultra SCSI 3590 IBM F50 mirror Ultra SCSI 3590 HIPPI 25 MB/s

6. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 6 Data currently in HPSS at CERN  Mixed sized files 1 TB, 15000 files, 60MB average  Raw Experimental Data and Test Beam Files NA57 raw data: 2 TB, 3000 files (to be repeated) Atlas Objectivity test data: 1 TB in 2000 files (to be repeated) CMS 700 GB, 5000 test beam files, 140 MB average sometimes 3 TB in one day  Total 10 TB, 65000 files, 100-800 tape mounts / day

7. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 7 Current and Future Work  Ongoing work with HPSS: ALICE data challenge largely successful, will be repeated test scalability of the name space to several million files upgrade to 4.1.1 for new function & Y2K when Encina TX arrives!  Successful service but too soon to commit to HPSS: Complete COMPAQ port now underway - and Solaris port coming BABAR started with HPSS & Objectivity so we will learn from them CERN stager enhancement program (CASTOR) well under way  Will run HPSS till end 2000 with modest expansion and some stress testing to complete evaluation  Limited volume of real data in HPSS could be exported to another system if final decision is to stop HPSS

8. 20-22 September 1999 HPSS User Forum, Santa Fe CERN IT/PDP 8 HPSS Wish List  Short Term Encina TX series 4.2, so can move/port to HPSS 4.1.1 Better monitoring information - help with Redwood problems New changecos option helps, but other improvements needed  Long Term Non-DCE movers Movers running on Linux Improved random access and small-file migration performance Guaranteed input rate ways to avoid disk contention problems number of tape drives dedicated to a COS avoid stopping PVL etc. to change configuration multiple HPSS systems on same license