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First OpenVMS with VIOC?

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The Question is:

 
I have a legacy application that (shame shame) runs on VMS 5.5-2h4. It reads a
data file repeatedly causing ridiculous amounts of IO. One solution may be to
use a DECRAM device and a specific logical to get to the file but I was reading
about VIOC and VBN _CACHE_S. When I do a "sho mem/cache" I get "unrecognized
qualifier". When I do mcr sysgen and sho vbn_cache_s I see a value. I have set
it to 1 (use current, set, write current and reboot) and still do not get the
sho mem/cache to work.
 
Am I correct in thinking that the sysgen value made it into this version of VMS
in anticipation of the virtual cache to come along in another release?
 
To be more concise - what is the first version of VMS that supported VIOC?
 
[Yes I know we should be upgrading, but this is a situation where a contractor
owns the source. I was hoping that I could find a way to releive this IO problem
without funding a redesign.]

The Answer is :

 
  V6.0.
 

  
     
     answer written or last revised on ( 7-MAR-2000 )
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