Thanks Luc,
It seems to be almost working but I get the following output (see image)
I should also point out I connected PowerCLI directly to the host not vCenter, the batch file I'm trying to run is an SQLIO.exe with the following:
@ECHO OFF
sqlio -kR -t8 -s120 -frandom -o32 -b4 -BH -LS -Fparam.txt
