root@hostnode:~# hdparm -tT /dev/sda2

    /dev/sda2:
     Timing cached reads:   12600 MB in  2.00 seconds = 6315.00 MB/sec
     Timing buffered disk reads: 1226 MB in  3.00 seconds = 408.14 MB/sec
    root@hostnode:~# hdparm -tT /dev/sda2

    /dev/sda2:
     Timing cached reads:   12338 MB in  2.00 seconds = 6183.45 MB/sec
     Timing buffered disk reads: 1240 MB in  3.00 seconds = 413.23 MB/sec
    root@hostnode:~# hdparm -tT /dev/sda2

    /dev/sda2:
     Timing cached reads:   12786 MB in  2.00 seconds = 6408.85 MB/sec
     Timing buffered disk reads: 1244 MB in  3.00 seconds = 414.55 MB/sec