Poor hard drive performance

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http://serverfault.com – I have nearly two identical servers, the only difference between the two is the version of Linux and the Hard Drive. Server 1 had (what I think) is a better drive, therefore the performance should be better then what I'm seeing compared to Server 2. Most notably is the difference between the dd test on server 1 and 2 as seen below. Any suggestions on what to check and what would cause this? Server 1: Drive is a Barracuda 7200.12 SATA 6Gb/s 1TB Hard Drive w/64 MB Cache Running XenServer, test performed @ the non-guest level. hdparm -i /dev/sda /dev/sda: Model=ST31000524AS (HowTos)