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server:~# for ((i=1;$i<4;i++));do sudo hdparm -tT /dev/hd[ac]1 /dev/md0; done

/dev/hda1:
 Timing cached reads:   164 MB in  2.04 seconds =  80.36 MB/sec
 Timing buffered disk reads:   38 MB in  3.09 seconds =  12.29 MB/sec

/dev/hdc1:
 Timing cached reads:   164 MB in  2.03 seconds =  80.76 MB/sec
 Timing buffered disk reads:   38 MB in  3.11 seconds =  12.22 MB/sec

/dev/md0:
 Timing cached reads:   164 MB in  2.01 seconds =  81.40 MB/sec
 Timing buffered disk reads:   30 MB in  3.01 seconds =   9.97 MB/sec

/dev/hda1:
 Timing cached reads:   164 MB in  2.04 seconds =  80.36 MB/sec
 Timing buffered disk reads:   36 MB in  3.04 seconds =  11.85 MB/sec

/dev/hdc1:
 Timing cached reads:   164 MB in  2.02 seconds =  81.28 MB/sec
 Timing buffered disk reads:   36 MB in  3.06 seconds =  11.77 MB/sec

/dev/md0:
 Timing cached reads:   164 MB in  2.03 seconds =  80.84 MB/sec
 Timing buffered disk reads:   32 MB in  3.10 seconds =  10.34 MB/sec

/dev/hda1:
 Timing cached reads:   160 MB in  2.00 seconds =  79.85 MB/sec
 Timing buffered disk reads:   36 MB in  3.17 seconds =  11.34 MB/sec

/dev/hdc1:
 Timing cached reads:   164 MB in  2.02 seconds =  81.12 MB/sec
 Timing buffered disk reads:   38 MB in  3.14 seconds =  12.12 MB/sec

/dev/md0:
 Timing cached reads:   164 MB in  2.02 seconds =  81.20 MB/sec
 Timing buffered disk reads:   32 MB in  3.20 seconds =  10.01 MB/sec
server:~# hdparm -I /dev/hd[ac] |grep dma
        DMA: mdma0 mdma1 *mdma2 udma0 udma1 udma2 udma3 udma4 udma5
        DMA: mdma0 mdma1 *mdma2 udma0 udma1 udma2 udma3 udma4 udma5