Comment 4 for bug 1287318

It works for me using your sample data. Can you check which version of the tool you are using?

root@ubuntu:/home/percona# pt-diskstats --version
pt-diskstats 2.2.7

root@ubuntu:/home/percona# pt-diskstats 5-sec-status-2014-02-27_09-diskstats 5-sec-status-2014-02-27_10-diskstats

  #ts device rd_s rd_avkb rd_mb_s rd_mrg rd_cnc rd_rt wr_s wr_avkb wr_mb_s wr_mrg wr_cnc wr_rt busy in_prg io_s qtime stime
  5.0 sda 174.8 46.0 7.9 5% 4.0 21.8 1.6 20.5 0.0 80% 0.0 1.7 97% 4 176.4 15.8 5.1
  5.0 sda1 174.8 46.0 7.9 5% 4.0 21.8 1.6 20.5 0.0 80% 0.0 1.7 97% 4 176.4 15.8 5.1

  #ts device rd_s rd_avkb rd_mb_s rd_mrg rd_cnc rd_rt wr_s wr_avkb wr_mb_s wr_mrg wr_cnc wr_rt busy in_prg io_s qtime stime
 10.0 sda 192.9 46.6 8.8 5% 4.1 20.4 8.2 110.6 0.9 45% 0.9 60.5 100% 4 201.1 18.4 4.6
 10.0 sda1 192.9 46.6 8.8 5% 4.1 20.4 8.2 110.6 0.9 45% 0.9 60.5 100% 4 201.1 18.4 4.6

  #ts device rd_s rd_avkb rd_mb_s rd_mrg rd_cnc rd_rt wr_s wr_avkb wr_mb_s wr_mrg wr_cnc wr_rt busy in_prg io_s qtime stime
 15.0 sda 158.6 47.2 7.3 5% 4.2 25.2 2.8 10.3 0.0 65% 0.0 0.2 100% 34 161.4 18.6 5.7
 15.0 sda1 158.6 47.2 7.3 5% 4.2 25.2 2.8 10.3 0.0 65% 0.0 0.2 100% 34 161.4 18.6 5.7

  #ts device rd_s rd_avkb rd_mb_s rd_mrg rd_cnc rd_rt wr_s wr_avkb wr_mb_s wr_mrg wr_cnc wr_rt busy in_prg io_s qtime stime
 20.0 sda 147.8 53.5 7.7 6% 4.1 26.3 13.2 119.3 1.5 38% 11.9 562.7 99% 4 161.0 86.7 5.6
 20.0 sda1 147.8 53.5 7.7 6% 4.1 26.3 13.2 119.3 1.5 38% 11.9 562.7 99% 4 161.0 86.7 5.6