1

Tier-2 Data Center at Kyungpook National University

for LHC-CMS Experiment

HyangKyu ParkCenter for High Energy Physics Kyungpook National University

Daegu, Korea

LHC Physics Workshop KonKuk U., Aug. 10~12, 2010

ROOT Tutorial(Tier-2 Summer School)

일시 : 8 월 12 일 14:00~18:00 장소 : PC 실

참여를 원하시는 분은 등록데스크 앞에서 모임

3

“The CMS detector is essentially 100-megapixel digital camera that will take 40 M pictures/s of particle interaction.” by Dan Green.

The High Level Trigger farm writes RAW events with 1.5 MB at a rate of 150 Hz.

1.5 MB x 150/s x 107 s ≈ 2.3 Peta-Byte/yr

4

LEP & LHC in Numbers

LEP (1989/2000)

CMS (2009)

Factor

Nr. Electronic Channels 100 000 10 000 000 x 102 Raw data rate 100 GBs 1 000 TBs x 104 Data rate on Tape 1 MBs 100 MBs x 102 Event size 100 KB 1 MB x 10

Bunch Separation 22 s 25 ns x 103 Bunch Crossing Rate 45 KHz 40 MHz x 103 Rate on Tape 10 Hz 100 Hz x 10 Analysis 0.1 Hz

(Z0, W) 10-6 Hz (Higgs)

x 105

5

The LHC Data Grid Hierarchy

Outside/CERN Ratio Larger; Expanded Role of Tier1s & Tier2s: Greater Reliance on Networks

KNU

~2000 physicists, 40 countries

~10s of Petabytes/yr ~1000 Petabytes in < 10 yrs?

6

Service and Data Hierarchy Tier-0 at CERN

– Data acquisition & reconstruction of raw data– Data Archiving (Tape & Disk storage) – Distribution of raw & recon data -> Tier-1 centers

Tier-1– Regional & global serivces

• ASCC (Taiwan), CCIN2P3 (Lyon), FNAL (Chicago), GridKA (Kalsruhe), INFN-CNAF (Bologna), PIC (Barcelona), RAL (Oxford)

– Data Archiving (Tape & Disk storage)– Reconstruction– Data Heavy Analysis

Tier-2– ~40 sites (including Kyungpook National Univ.)– MC production– End-user Analysis (Local community use)

7

https://vocms08.cern.ch/sitedb/sitelist/

KNU is registered as Tier-2 in CMS.

8

http://t2-cms.knu.ac.kr

9

Current Tier-2 Computing Resources

CPU

10

CMS Computing Resources in KNU

CPU (kSI2k) 470 (~350 cpus)

Disk Storage (TB) 190

(14 of Disk Servers)

Tape (TB) 46

WAN (Gbps) 20 (KREONET+KOREN)

Grid System LCG

Support High Energy

CMS Computing Role

Tier-2

11

TEIN2 North/ORIENT

622 155

45

45

155

PH

VN

TH

ID

MY

45

3 x 622

2.5G(622M)

North America(via TransPAC2)(via GLORIAD)

EU

EU

622

622M+1G

4 x 155

AU

HK

SG

JP

CN KR

KREONET/GLORIAD KR-CN

KOREN/APII KR-JP

APII/TEIN3, GLORIAD

TEIN3 South

622

622

10G(2G)

10G 10G

10G

Courtesy by Prof. D. Son and Dr. B.K. Kim

12

CMS Computing Activities in KNU

Running Tier-2 Participating in LCG Service Challenges, CSAs every

year as Tier-2– SC04 (Service Challenge): Jun. ~ Sep.,2006– CSA06 (Computing, Software & Analysis): Sep. ~ Nov., 2006– Load Test 07: Feb ~ Jun., 2007– CSA07: Sep. ~ Oct., 2007– Pre CSA08: Feb.,2008– CSA08: May~June, 2008– STEP09: June, 2009

Testing, Demonstrating, Bandwidth Challenging – SC05, SC06, SC07, SC08,SC09

Supporting physics analyses– RS Graviton search– Higgs search– W’ search

13

Preparing Physics Analyses using KNU_T2

Study on Randall-Sundrum Graviton with the mode G* →ZZ →μ+μ- μ+μ-

– Generation of total 800 k events: 80 sets of MCs (16 points x 5 parameters)

Study on Drell-Yan Process – MS student thesis topic

– It took only 1 night for generation of 200 k MC events

MG* =500 GeV

One Year Performances in KNU-Tier-2 (I)

MIT

DESY

KNU

MIT

UK-RAL

DESY

KNU

KNU

MIT

DESY

One Year Performances in KNU-Tier-2 (II)

MIT

DESY

KNU

KNU -> T1

Recent Performances in KNU-Tier-2 (III)

MIT

DESY

KNU

T1 -> KNU

Recent Performances in KNU-Tier-2 (IV)

~90% efficiency

 

Recent Performances in KNU-Tier-2 (V) 

Establishing CMS Center (I)

MIT

DESY

Current worldwide CMS Centers

Establishing CMS Center (II)

MIT

DESY

Communication focal point for students, postdocs & faculties. CMS operations:

– Sub-detector data quality monitoring– Data analysis– CMS computing operation– Remote shift

Outreach Activities:– Increase CMS visibility – Attract new students– Tour and discussions with physicists– Live display, posters and other exhibits

Media Event for First 7 TeV Collisions in March 30 at the CMS Center

MIT

DESY

22

Future Plan

Manpower: Total 3 FTE Computing Resources

Dedicated to the Exotica Group & QCD but strong desire to work with Higgs and SUSY group

Local user supports for physics analyses– We are accepting a proposal to use our Tier-2 resources

Year 2010 2011 2012 2013

CPU (kSI2k) 710 (470) 800 900 1000

Disk (TB) 205 (190) 230 250 250

Network (Gbps)

20 20 20 20

23

Summary

We are pretty much ready for CMS physics analysis

Your support is vital for a success of Tier-2 operation.

LHC experiment has started, and produce “10 PB/yr” soon.

It’s time to seriously think about LHC data center in Korea that will offer another big step for KR-HEP program.