How to layout sparce files before run? Why all files for all jobs have same size?

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Hello, Fio.

  How could I tell fio to don't write anything but last byte into
 files used for jobs? I need to test random write to sparse files with
 read only from written parts (like dumb torrent clients does).

  And why when I have N jobs with "filesize=2G-4G" all filesizes for
 all jobs are equal?

-- 
// Black Lion AKA Lev Serebryakov <lev@xxxxxxxxxxxxxxxxxx>

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