Thanks for your reply @Brian Cram, This is something I did not know, but I am always happy to be advised. I trust that by this forum many more will appreciate the in-depth knowledge one can gain by subscription.
With regards to the "Linux Kills!" : The Linux systems engineer had not given Linux enough memory to maintain the D3 machine, hence the error. My thoughts were similar to that plumber who has to balance the hot and cold flow (bad analogy).