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PHENIX Computing Center in Japan (CC-J)

PHENIX Computing Center in Japan (CC-J). Takashi Ichihara (RIKEN and RIKEN BNL Research Center ) Presented on 08/02/2000 at CHEP2000 conference, Padova, Italy. Contents. 1. Overview 2. Concept of the system 3. System Requirement 4. Other requirement as a Regional Computing Center

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PHENIX Computing Center in Japan (CC-J)

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  1. PHENIX Computing Center in Japan (CC-J) Takashi Ichihara (RIKEN and RIKEN BNL Research Center) Presented on 08/02/2000 at CHEP2000 conference, Padova, Italy

  2. Contents 1. Overview 2. Concept of the system 3. System Requirement 4. Other requirement as a Regional Computing Center 5. Plan and current status 6. WG for constructing the CC-J (CC-J WG) 7. Current configuration of the CC-J 8. Photographs of the CC-J 9. Linux CPU farm 10. Linux NFS performance v.s. kernel 11. HPSS current configuration 12. HPSS performance test 13. WAN performance test 14. Summary Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  3. PHENIX CC-J : Overview • PHENIX Regional Computing Center in Japan (CC-J) at RIKEN • Scope • Principal site of computing for PHENIX simulation • PHENIX CC-J is aiming at coveringmost of the simulation tasks of the whole PHENIX experiments • Regional Asian computing center • Center for the analysis of RHIC spin physics • Architecture • Essentially follow the architecture of RHIC Computing Facility (RCF) at BNL • Construction • R&D for the CC-J started in April ‘98 at RBRC • Construction began in April ‘99 over athree years period • 1/3 scale of of the CC-J will be operational in April 2000 Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  4. Concept of the CC-J System Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  5. Annual Data amount DST 150 TB micro-DST 45 TB Simulated Data 30 TB Total225 TB Hierarchical Storage System Handle data amount of 225TB/year Total I/O bandwidth: 112 MB/s HPSS system Disk storage system 15 TB capacity All RAID system I/O bandwidth: 520 MB/s System Requirement for the CC-J • CPU ( SPECint95) • Simulation 8200 • Sim. Reconst 1300 • Sim. ana. 170 • Theor. Mode 800 • Data Analysis 1000 • Total 11470 • Data Duplication Facility • Export/import DST, simulated data. Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  6. Other Requirements as a Regional Computing Center • Software Environment • Software environment of the CC-J should be compatible to the PHENIX Offline Software environment at the RHIC Computing Facility (RCF) at BNL • AFS accessibility (/afs/rhic) • Objectivity/DB accessibility (replication to be tested soon) • Data Accessibility • Need exchange data of 225 TB/year to RCF • Most part of the data exchange will be done by SD3 tapecartridges (50GB/volume) • Some part of the data exchange will be done over theWAN • CC-J will use Asia-Pacific Advanced Network (APAN) for US-Japan connection • http://www.apan.net/ • APAN has currently 70 Mbps bandwidth for Japan-US connection • Expecting 10-30% of the APAN bandwidth (7-21 M bps) can be used for this project: • 75-230 GB/day ( 27 - 82 TB/year) will be transferred over the WAN Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  7. Plan and current status of the CC-J Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  8. Working Group for the CC-J construction (CC-J WG) • CC-J WG is a main body to construct the CC-J • Hold bi-weekly regular meeting at RIKEN Wako, to discuss technical items and project plans etc. • Mailing list of the CC-J WG created (mail traffic: 1600 mails /year) Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  9. Current configuration of the CC-J

  10. Photographs of the PHENIX CC-J at RIKEN

  11. Linux CPU farms • Memory Requirement : 200-300 MB/CPU for a simulation chain • Node specification • Motherboard: ASUS p2b • Dual CPU /node (currently total 64 CPU) • PentiumII (450MHz) 32 CPU + Pentium III (600 MHz) 32 CPU • 512 MB memory / node (1GB SWAP/node) • 14 GB HD /node (system 4GB, work 10 GB) • 100 BaseT Ethernet interface (DECchip Tulip) • Linux Redhat 5.2 (kernel 2.2.11 + nfsv3 patch) • Portable Batch System (PBSV2.1) for batch queuing • AFS is accessed through the NFS (No AFS client is installed on Linux pc) • Daily mirroring of the /afs/rhic contents to a local disk file system is carrying out • PC Assemble (Alta cluster) • Remote hardware-reset/power control, Remote CPU temp. monitor • Serial port login from the next node (minicom) for maintenance (fsck etc.) Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  12. Linux NFS performance v.s. kernel • NFS Performance test using bonnie benchmark for 2 GB file • NFS Server : SUN Enterprise 450 (Solaris 2.6) 4 CPU (400MHz) 1GB memory • NFS client : Linux RH5.2, Dual Pentium II 600 MB, 512 MB memory • NFS performance of the recent Linux kernel seems to be improved • nfsv3 patch is still useful for the recent kernel (2.2.14) • currently we are using the kernel 2.2.11 + nfsv3 patch • nfsv3 patch is available from http://www.fys.uio.no/~trondmy/src/ Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  13. Current HPSS hardware configuration • IBM RS6000-SP • 5-node (silver node: Quadruple PowerPC604e 332 MHz CPU/node) • Core server : 1, Disk mover : 2, Tape mover : 2 • SP switch(300 MB/s) and 1000BaseSX NIC (OEM of Alteon) • A StorageTek Powderhorn Tape Robot • 4 Redwood drives and 2000 SD3 cartridges (100 TB) dedicated for HPSS • Sharing the robot with other HSM systems • 6 drives and 3000 cartridges for other HSM systems • Gigabit Ethernet • Alteon ACE180 switch for Jumbo Frame ( 9 kB MTU) • Use of the Jumbo Frame reduces the CPU utilization for transfer • CISCO Catalyst 2948G for distribution to 100BaseT • Cache Disk : 700 GB (total), 5 components • 3 SSA loops (50 GB each) • 2 FW-SCSI RAID (270 GB each) Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  14. Performance test of parallel ftp (pftp) of HPSS • pput from SUN-E450 : 12 MB/s for one pftp connection • Gigabit Ethernet, Jumbo Frame (9 kB MTU) • pput from LINUX : 6 MB/s for one pftp connection • 100BaseT - G.Ether - Jumbo (defragment on a switch) • Totally 〜50 MB/s pftp performance was obtained for pput Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  15. WAN performance test • RIKEN (12 Mbps) - IMnet - APAN (70 Mbps) -startap- ESnet - BNL • Round Trip Time for RIKEN-BNL :170 ms • File transfer rate is 47 kB/s for 8 kB TCP widowsize (Solaris default) • Large TCP-window size is necessary to obtain high-transfer rate • RFC1323 (TCP Extensions for high performance, May 1992) describes the method of using large TCP window-size (> 64 KB) • Large ftp performance (641 kB/s = 5 Mbps) was obtained for a single ftp connection using a large TCP window-size (512 kB) over the pacific ocean (RTT = 170 ms) Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

  16. Summary • The construction of the PHENIX Computing Center in Japan (CC-J) at RIKEN Wako campus, which will extend over a three years period, began in April 1999. • The CC-J is intended as the principal site of computing for PHENIX simulation, a regional PHENIX Asian computing center, and a center for the analysis of RHIC spin Physics. • The CC-J will handle the data of about 220 TB/year and the total CPU performance is planned to be 10,000 SPECint95 in 2002. • CPU farm of 64 processors (RH5.2, kernel 2.2.11 with nfsv3 patch) is stable. • About 50 MB/s pftp performance was obtained for HPSS access. • Large ftp performance (641 KB/s = 5 Mbps) was obtained for a single ftp connection using a large TCP window-size (512 kB) over the Pacific Ocean (RTT = 170 ms) • Stress tests for the entire system were carried out successfully. • Replication of the Objectivity/DB over the WAN will be tested soon. • The CC-J operation will be started in April 2000. Takashi Ichihara (RIKEN / RIKEN BNL Research Center)

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