SCSI disk speed inconsistency

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I get a read speed of 69MBps from my SCSI disk and a write speed of 49MBps from the same. An IOMeter benchmark on the net says that 68MBps is the sustained speed for a write.

Could someone tell me how to increase my IO speed?

I have a Linux Kernel 2.6 in a RedHat Enterprise Linux WS 4 and I used the foll.
Read : sg_dd if=/dev/sdb  of=/dev/null bs=262144 count=1024 dio=1
Write: sg_dd if=/dev/zero of=/dev/sdb  bs=262144 count=1024 dio=1
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