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TABLE 17.2
The Requirements in Terms of CPU, Disk, and Tape Storage
Requirements—All Experiments
2007
2008
2009
2010
CPU (MSI2K)
CERN total
10.0
25.3
34.5
53.7
CERN Tier-0
6.9
17.5
22.4
32.8
CERN T1/T2
3.1
7.8
12.1
20.9
All external Tier1s
19.2
55.9
85.2
142.0
All Tier2s
23.6
61.3
90.4
136.6
Total
53
143
210
332
Disk(TB)
CERN total
2200
6600
9200
12,600
CERN Tier0
400
1300
1400
1800
CERN T1/T2
1800
5300
7800
10,800
All external Tier1s
9300
31,200
45,400
72,100
All Tier2s
5200
18,800
32,400
49,200
Total
17,000
57,000
87,000
134,000
MSS (TB)
CERN total
4900
18,000
31,100
45,600
CERN Tier0
3400
13,600
23,600
34,500
CERN T1/T2
1500
4400
7500
11,100
All external Tier1s
9300
34,700
60,800
92,200
Total
14,000
53,000
92,000
138,000
It is important to note that 2008 is the start-up year for LHC but is also a
key year for EGEE. The year 2008 marks the end of the i rst part of the
EU-funded project launched in 2004 as a four-year program (EGEE-1 April
2004 to March 2006 and EGEE-2 April 2006 to April 2008). A third two-year
phase (EGEE-3) has started in May 2008, which will be incontestably the year
where the plans for a longer-term, sustainable infrastructure will have to be
clarii ed and unfolded. The long-term future of grid computing to the scale
attained by projects like EGEE will depend on these decisions and plans.
17.4
Each experiment has prepared specii c mechanisms to ease the access to
the grid for their physics community. As an example we will start from
the case of ATLAS and LHCb and their system called Ganga.
HEP Analysis
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