Eventually we had to get VMware into to sort this they made some registry and other changes to the cluster that we were not made aware off that fixed the error  Outside of this we found no way outside the articles listed to try and resolve this issue  So answer is put a call into VMware seems to be the only way to get a fix
All  I have a lost communication error showing for a server on VMware 5.1 against a VMAX  Checks seem to inidicate a PDL issue for the device  The articles below seem to indicate fixes but i have treid powering off effected machine and re-mount etc and rescan but it does not seem to work not able to login to teh actual ESXi host as lack permissions so not able to try a LUN reset  [URL]  [URL]  [URL]  Is there anything else i can try to fix this lost communication error on the vmware etc
Lost Connection issue VMWare