Google sorts 1 Petabyte of data in 6 hours !
Check it out for yourself: http://googleblog.blogspot.com/2008/11/sorting-1pb-with-mapreduce.html [4]
Links:
[1] http://linux.philosweb.com/drupal/category/it/it-general
[2] http://linux.philosweb.com/drupal/category/it/search
[3] http://linux.philosweb.com/drupal5/files/image_2_44.png
[4] http://googleblog.blogspot.com/2008/11/sorting-1pb-with-mapreduce.html