gistfile1.txt

Timing O_DIRECT cached reads:   998 MB in  2.00 seconds = 498.62 MB/sec
Timing O_DIRECT disk reads: 1268 MB in  3.00 seconds = 422.44 MB/sec

/dev/xvda:
Timing O_DIRECT cached reads:   150 MB in  2.02 seconds =  74.20 MB/sec
Timing O_DIRECT disk reads: 118 MB in  3.05 seconds =  38.69 MB/sec ubuntu@ip-172-31-5-75:~$ sudo hdparm -tT --direct /dev/xvdg

/dev/xvdg:
Timing O_DIRECT cached reads:   176 MB in  2.01 seconds =  87.73 MB/sec
Timing O_DIRECT disk reads: 238 MB in  3.02 seconds =  78.79 MB/sec