# Presentation: 273304

## PC clusters in KEK

- A.Manabe KEK(Japan)

## PC clusters in KEK

- Belle (in KEKB) PC clusters
- Neutron Shielding Simulation cluster
- Some other activity on PC cluster

- LSCC WS  '01

- 22 May '01

## Belle PC cluster

- Utilized for experimental data production.  ‘raw data’ to ‘reconstructed data’.
- >400 CPUs by 3 clusters
- Cooperation with SUN servers for I/O (B computer system)
- Number of Users is rather small. (<5)
- Major PCs are 4 CPU SMP machines.Homemade SW ‘basf’ for SMP processing.(old system was by 28cpu SMP servers)

- LSCC WS  '01

- 22 May '01

## Belle PC cluster (1)

- since 1999
- CPU nodes - DELL PowerEdge 6300(4CPU@**Pentium III** Xeon 500MHz+9Gdisk) x 36
- Disk nodes(2CPU+800GB (Arena) RAID DISK) x 8
- Switch100BaseT Switch 1000BaseSX: uplink to B computer system
- Installed by physicists, Rack is homemade

- LSCC WS  '01

- 22 May '01

## Belle PC cluster1,2

- Cluster 1

- Cluster 2

- LSCC WS  '01

- 22 May '01

## Belle PC cluster (2)

- since 2000 winter
- CPU nodes - Compaq Proliant DL360 (2CPU x Pentium III 800-900MHz+9Gdisk)x40
- Disk nodes(2CPU + 1.2TB RAID disk)x4
- Installed by Compaq (HW and SW)(~1week for all installation)

- LSCC WS  '01

- 22 May '01

## Belle PC cluster(3)

- since 2001 March
- CPU nodes - Compaq ProLiant D580(4CPU@Pentium III Xeon 700MHz+50GBdisk)x60
- Switch100BaseT to each nodes1000BaseSX to B computer system
- 5 years lease
- included in the B computer budget.
- Installation service; initial and a few/year.

- LSCC WS  '01

- 22 May '01

## Belle PC cluster3

- LSCC WS  '01

- 22 May '01

## SW

- Tape Library

- PC Disk Server

- SUN WS

- 1.

- PC nodes

- 2.

- 3.

- 1. TCP data transfer SW copy
-     a RAW data file in tape to
-     files in Disk server. (9MB/s)
- 2. Production jobs running in
-     PC nodes reading/writing 	  	from/to the file using NFS.
- 3. write back Reconstructed
-     data files to a tape or HSM         			system.

- LSCC WS  '01

- 22 May '01

## Some numbers

- 1 event processing takes about 6 sec by 1GHz Pentium III
-  1 job =1 exp. run ~16GB = 32files  10~20 hours by 4CPU(1PC node)
- Job submission is done manually with help of Perl scripts and a DB managing exp. run information.

- LSCC WS  '01

- 22 May '01

## Belle PC cluster summary

- Belle PC cluster
- 464 CPU (500-933MHz), 256MB memory/CPU
- ~14TB disk (RAID ~10TB,local~4TB)
- 100BaseT network
- B computer system (data server and general users)
- ~40 SUN servers (each has a DTF2 tape drive)
- Tape Library 500TB (Sony DTF2)
- ~20 NFS/HSM* Disk (~10TB RAID) servers

- HSM=Hierarchical Storage Management System

- LSCC WS  '01

- 22 May '01

## Simulation farm for the HIPAF beam line design.

- High Intensity Proton Accelerator Facility50GeV 15microA
- Simulation for Neutron beam line design and neutron radiation shielding.
- ~50 x (2 CPU@1GHz Pentium III)
- NMTC, MCNP on MPI
- Will be Installed in this year

- LSCC WS  '01

- 22 May '01

## Other Activity

- PC farm I/O R&D by the comp. center
- HPSS  (Linux HPSS client API driver by IBM)
- Storage Area Network  (with Fujitsu)
- GRID Activity for ATLAS Regional Center in Japan.
- Gfarm (http://datafarm.apgrid.org/index.en.html)

- LSCC WS  '01

- 22 May '01