Disable host file cache for guest machine

Hello,

Is there a way for vmware to not cache the vmdk hard disk files? I run some benchmarks in vmware-servers and I need all the files to be read from the disk all the time.

The host is linux ubunutu. The guest is windows XP. I have allready added the following entries to the .vmx file, but they don't seem to make any difference.

diskLib.dataCacheMaxSize = "0"

diskLib.dataCacheMaxReadAheadSize = "0"

diskLib.dataCacheMinReadAheadSize = "0"

diskLib.dataCachePageSize = "4096"

diskLib.maxUnsyncedWrites = "0"

My guess is that the *vmdk files are cached by the host, is there any way to tell vmware that the host should not cache the vmdk files. Or is there another way to avoid this?

Thanks