Well the Format is VMFS6 and maybe that will cure the Symptomes , but as written above I have 30 other Server which work fine . I have placed the Question up here to get maybe a new approach to the Problem , at the Moment I put my money on maybe defectiv SFP+ . a
Thanks MMosaadObaid for an Idea but turning the Heartbeat of seems to me a very dirty approach and it wouldnot explain that the other 30th Server are running stable and fine . with given firmware and Hardware . Its a really tricky question .
If we really should have a SFP+ Adapter Hardware Problem is shouldnt affect whole Server as it is seen with an ISCSI Software Adapter, to bad that I cant do the Tests with ISCSI HBA .
We are still in Contact with the Support .
Below you find the Articel Regarding Heartbeat and ATS :