Vdbench 5.04 - Solaris - read/write profile problem

Hi, I'm trying to simulate a read/write IO profile to a raw disk. Have a Solaris 10 x86 server connected to a VNX over Fibre Channel.
The profiles are spread over IO sizes ranging from 512b to 128k but I've tried getting this simplified version to work without success.
I am using Vdbench 5.04. This is my parameter file:
sd=sd1,lun=/dev/dsk/c3t60060160C43034009EF8FCAE1522E311d0s2
wd=write,sd=sd1,readpct=0,xfersize=(4k,50,8k,50)
wd=read,sd=sd1,readpct=100,xfersize=(4k,50,8k,50)
rd=test,wd=(write,read),maxdata=4.5g,elapsed=3600,threads=50,iorate=500
I have a dtrace script (iosnoop from the DTraceToolkit) running monitoring the I/O.
From the output of the dtrace script I am seeing no 8k reads or 4k writes.
The statistics from the VNX show the same results as the dtrace output so what is being written to the LUN is correct.
Is xfersize the correct way to simulate a range of I/O sizes or is their a mistake in the parameter file?
Any help appreciated :-)

You are caching your i/o. Please specify /dev/rsdk/

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> all in RGB format. I have also tried different frame rates and
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> buying software is not an option for me.
>
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with this? Are there AVI encoding
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Vdbench 5.04 - Solaris - read/write profile problem

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