??4?22?????????????????????????????????????????????????Google?????????????????????????????????????????????????????????????

???????????????
?????????????????????????????????????2003??15?kwh(????????)??????

???????????????

?????????Google???????????????????????????????????????????????Google???????????????????????

2004??????5?????2007?????50????????????????????????????????????????????????Google????????????????????????Google????????????????????????

????1??????????????120w?24??????????????????????????????1?????????????????????????????

120w * 24 * 1.5 * 365 = ?1500kwh

????50?????

1500kwh * 500,000 = 788,400,000kwh

?8000?kwh!!!

2003??15?kwh?2010??????????20?kwh???????2007??17?kwh????????????????2007?????????????????Google?????????????

800 / 17,000 * 100 = 4.7%

5%??

?????????????????????????????????????????????????????????????Google?????????????????????????

So much data, relatively little space??????????????2003??5??????(exa?10???)????????IDC??????????2006???40????????????????????????????????????????????????3???10??????????????????3???8??????????????????????????????Google????????????????????????????????

IDC?????????????????????2007??161?????????2010???988?????????????????3???6?????????????Google??????300??????????5?kwh!!!????2010??????????????20?kwh????????25??Google???????????

???????????????????????????????????????????????????????????????????????????2015???2020???????????????Google??????????????????????

???????????????????????5%?Google?????????????????????????????????????10??????????0.5%?????????