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  1. ################################################################################################
  2.  
  3. Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-96-generic x86_64)
  4.  
  5. System information as of Thu Sep 21 17:02:51 CEST 2017
  6.  
  7. System load: 1.96 Processes: 201
  8. Usage of /: 83.2% of 43.88GB Users logged in: 0
  9. Memory usage: 4% IP address for eth0:
  10. Swap usage: 0% IP address for docker0: 172.17.0.1
  11.  
  12. ################################################################################################
  13.  
  14. ======================================================================================
  15. V M D K --- R A W !!! --- on Transcend SSD370 128 GB
  16. ======================================================================================
  17.  
  18. Timing O_DIRECT cached reads: 1024 MB in 2.00 seconds = 511.61 MB/sec <---
  19. Timing O_DIRECT disk reads: 1134 MB in 3.00 seconds = 377.88 MB/sec <---
  20.  
  21. Timing O_DIRECT cached reads: 1042 MB in 2.00 seconds = 520.82 MB/sec <---
  22. Timing O_DIRECT disk reads: 1162 MB in 3.00 seconds = 387.27 MB/sec <---
  23.  
  24. ---
  25.  
  26. Timing O_DIRECT cached reads: 816 MB in 2.00 seconds = 407.55 MB/sec
  27. Timing O_DIRECT disk reads: 1020 MB in 3.01 seconds = 339.43 MB/sec <---
  28.  
  29. ======================================================================================
  30. V M D K --- on Samsung Pro 850 515GB
  31. ======================================================================================
  32.  
  33. Timing O_DIRECT cached reads: 836 MB in 2.00 seconds = 417.21 MB/sec <---
  34. Timing O_DIRECT disk reads: 782 MB in 3.01 seconds = 260.21 MB/sec
  35.  
  36. Timing O_DIRECT cached reads: 834 MB in 2.00 seconds = 416.08 MB/sec
  37. Timing O_DIRECT disk reads: 786 MB in 3.00 seconds = 261.71 MB/sec
  38.  
  39. ---
  40.  
  41. Timing O_DIRECT cached reads: 826 MB in 2.00 seconds = 412.75 MB/sec <---
  42. Timing O_DIRECT disk reads: 774 MB in 3.00 seconds = 257.79 MB/sec
  43.  
  44. Timing O_DIRECT cached reads: 828 MB in 2.00 seconds = 413.88 MB/sec <---
  45. Timing O_DIRECT disk reads: 774 MB in 3.00 seconds = 257.83 MB/sec
  46.  
  47. ---
  48.  
  49. Timing O_DIRECT cached reads: 842 MB in 2.00 seconds = 420.76 MB/sec <---
  50. Timing O_DIRECT disk reads: 770 MB in 3.00 seconds = 256.56 MB/sec
  51.  
  52. ======================================================================================
  53. V D I --- on Samsung Pro 850 515GB
  54. ======================================================================================
  55.  
  56. Timing O_DIRECT cached reads: 470 MB in 2.01 seconds = 234.21 MB/sec <---
  57. Timing O_DIRECT disk reads: 766 MB in 3.00 seconds = 254.94 MB/sec
  58.  
  59. Timing O_DIRECT cached reads: 494 MB in 2.00 seconds = 246.45 MB/sec <---
  60. Timing O_DIRECT disk reads: 754 MB in 3.00 seconds = 250.92 MB/sec
  61.  
  62. Timing O_DIRECT cached reads: 490 MB in 2.00 seconds = 244.46 MB/sec <---
  63. Timing O_DIRECT disk reads: 764 MB in 3.01 seconds = 254.03 MB/sec
  64.  
  65. ################################################################################################
  66. # Data above comes from here
  67. ################################################################################################
  68.  
  69. ======================================================================================
  70. V M D K --- on Samsung Pro 850 515GB
  71. ======================================================================================
  72.  
  73. System information as of Thu Sep 21 17:02:51 CEST 2017
  74.  
  75. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  76. /dev/sda:
  77. Timing O_DIRECT cached reads: 836 MB in 2.00 seconds = 417.21 MB/sec <======
  78. Timing O_DIRECT disk reads: 782 MB in 3.01 seconds = 260.21 MB/sec <======
  79.  
  80. user@xeon:~$ sudo hdparm -tT /dev/sda
  81. /dev/sda:
  82. Timing cached reads: 21080 MB in 2.00 seconds = 10554.40 MB/sec
  83. Timing buffered disk reads: 784 MB in 3.00 seconds = 260.92 MB/sec
  84.  
  85. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  86. /dev/sda:
  87. Timing O_DIRECT cached reads: 834 MB in 2.00 seconds = 416.08 MB/sec <======
  88. Timing O_DIRECT disk reads: 786 MB in 3.00 seconds = 261.71 MB/sec <======
  89.  
  90. ======================================================================================
  91. V M D K --- R A W !!! --- on Transcend SSD370 128 GB
  92. ======================================================================================
  93.  
  94. System information as of Thu Sep 21 17:00:47 CEST 2017
  95.  
  96. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  97. /dev/sda:
  98. Timing O_DIRECT cached reads: 1024 MB in 2.00 seconds = 511.61 MB/sec <======
  99. Timing O_DIRECT disk reads: 1134 MB in 3.00 seconds = 377.88 MB/sec <======
  100.  
  101. user@xeon:~$ sudo hdparm -tT /dev/sda
  102. /dev/sda:
  103. Timing cached reads: 21182 MB in 2.00 seconds = 10603.52 MB/sec
  104. Timing buffered disk reads: 1060 MB in 3.00 seconds = 352.91 MB/sec
  105.  
  106. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  107. /dev/sda:
  108. Timing O_DIRECT cached reads: 1042 MB in 2.00 seconds = 520.82 MB/sec <======
  109. Timing O_DIRECT disk reads: 1162 MB in 3.00 seconds = 387.27 MB/sec <======
  110.  
  111. ======================================================================================
  112. V M D K --- on Samsung Pro 850 515GB
  113. ======================================================================================
  114.  
  115. System information as of Thu Sep 21 16:58:12 CEST 2017
  116.  
  117. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  118. /dev/sda:
  119. Timing O_DIRECT cached reads: 826 MB in 2.00 seconds = 412.75 MB/sec <======
  120. Timing O_DIRECT disk reads: 774 MB in 3.00 seconds = 257.79 MB/sec <======
  121.  
  122. user@xeon:~$ sudo hdparm -tT /dev/sda
  123. /dev/sda:
  124. Timing cached reads: 22082 MB in 2.00 seconds = 11055.78 MB/sec
  125. Timing buffered disk reads: 788 MB in 3.01 seconds = 262.11 MB/sec
  126.  
  127. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  128. /dev/sda:
  129. Timing O_DIRECT cached reads: 828 MB in 2.00 seconds = 413.88 MB/sec <======
  130. Timing O_DIRECT disk reads: 774 MB in 3.00 seconds = 257.83 MB/sec <======
  131.  
  132. ======================================================================================
  133. V D I --- on Samsung Pro 850 515GB
  134. ======================================================================================
  135.  
  136. System information as of Thu Sep 21 16:55:24 CEST 2017
  137.  
  138. user@xeon:~$ sudo hdparm -tT /dev/sda
  139. /dev/sda:
  140. Timing cached reads: 21468 MB in 2.00 seconds = 10747.37 MB/sec
  141. Timing buffered disk reads: 662 MB in 3.01 seconds = 220.12 MB/sec
  142.  
  143. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  144. /dev/sda:
  145. Timing O_DIRECT cached reads: 470 MB in 2.01 seconds = 234.21 MB/sec <======
  146. Timing O_DIRECT disk reads: 766 MB in 3.00 seconds = 254.94 MB/sec <======
  147.  
  148. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  149. /dev/sda:
  150. Timing O_DIRECT cached reads: 494 MB in 2.00 seconds = 246.45 MB/sec <======
  151. Timing O_DIRECT disk reads: 754 MB in 3.00 seconds = 250.92 MB/sec <======
  152.  
  153. user@xeon:~$ sudo hdparm -tT /dev/sda
  154. /dev/sda:
  155. Timing cached reads: 20872 MB in 2.00 seconds = 10448.98 MB/sec
  156. Timing buffered disk reads: 694 MB in 3.01 seconds = 230.78 MB/sec
  157.  
  158. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  159. /dev/sda:
  160. Timing O_DIRECT cached reads: 490 MB in 2.00 seconds = 244.46 MB/sec <======
  161. Timing O_DIRECT disk reads: 764 MB in 3.01 seconds = 254.03 MB/sec <======
  162.  
  163. ======================================================================================
  164. V M D K --- on Samsung Pro 850 515GB
  165. ======================================================================================
  166.  
  167. System information as of Thu Sep 21 16:52:32 CEST 2017
  168.  
  169. user@xeon:~$ sudo hdparm -tT /dev/sda
  170. /dev/sda:
  171. Timing cached reads: 20872 MB in 2.00 seconds = 10448.90 MB/sec
  172. Timing buffered disk reads: 764 MB in 3.01 seconds = 254.11 MB/sec
  173.  
  174. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  175. /dev/sda:
  176. Timing O_DIRECT cached reads: 842 MB in 2.00 seconds = 420.76 MB/sec <======
  177. Timing O_DIRECT disk reads: 770 MB in 3.00 seconds = 256.56 MB/sec <======
  178.  
  179. ======================================================================================
  180. V M D K --- R A W !!! --- on Transcend SSD370 128 GB
  181. ======================================================================================
  182.  
  183. System information as of Thu Sep 21 16:29:55 CEST 2017
  184.  
  185. user@xeon:~$ sudo hdparm -tT /dev/sda
  186. /dev/sda:
  187. Timing cached reads: 22034 MB in 2.00 seconds = 11029.82 MB/sec
  188. Timing buffered disk reads: 990 MB in 3.00 seconds = 329.68 MB/sec
  189.  
  190. user@xeon:~$ sudo hdparm -tT --direct /dev/sda
  191. /dev/sda:
  192. Timing O_DIRECT cached reads: 816 MB in 2.00 seconds = 407.55 MB/sec <======
  193. Timing O_DIRECT disk reads: 1020 MB in 3.01 seconds = 339.43 MB/sec <======
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