PCI Bus limitations

backup ~ # hdparm -tT /dev/md1

/dev/md1:
Timing cached reads: 2232 MB in 2.00 seconds = 1115.98 MB/sec
Timing buffered disk reads: 404 MB in 3.02 seconds = 133.93 MB/sec

backup ~ # df -H | grep md1
/dev/md1 2,0T 206M 2,0T 1% /store1