北京大学：《大规模数据处理——云计算 Mass Data Processing Cloud Computing》课程教学资源（PPT课件）课程介绍 Introduction to Cloud Computing（主讲：彭波）

12 Maximilien Brice,CERN

12 Maximilien Brice, © CERN

13 Maximilien Brice,CERN

13 Maximilien Brice, © CERN

14 Maximilien Brice,CERN

14 Maximilien Brice, © CERN

15 Maximilien Brice,CERN

15 Maximilien Brice, © CERN

How much data? Google processes 20 PB a day (2008) Wayback Machine has 3 PB 100 TB/month(3/2009) a Facebook has 2.5 PB of user data +15 TB/day (4/2009) eBay has 6.5 PB of user data 50 TB/day (5/2009) CERN's LHC will generate 15 PB a year (?? 640K ought to be enough for anybody. 16

16 How much data? ◼ Google processes 20 PB a day (2008) ◼ Wayback Machine has 3 PB + 100 TB/month (3/2009) ◼ Facebook has 2.5 PB of user data + 15 TB/day (4/2009) ◼ eBay has 6.5 PB of user data + 50 TB/day (5/2009) ◼ CERN’s LHC will generate 15 PB a year (??) 640K ought to be enough for anybody