/dev/md0:
 Timing cached reads:   1860 MB in  2.00 seconds = 930.81 MB/sec
 Timing buffered disk reads:  548 MB in  3.00 seconds = 182.41 MB/sec

/dev/vg/root:
 Timing cached reads:   1870 MB in  2.00 seconds = 935.46 MB/sec
 Timing buffered disk reads:  154 MB in  3.00 seconds =  51.29 MB/sec