VxRail 4.0 introduces support to Dell hardware platform, VxRail Gen3 is based on Dell PowerEdge generation 13.
This article provides information about exporting the Tech Support Report (TSR) / SupportAssist Collection via the integrated Dell Remote Access Controller (iDRAC) web interface of Dell PowerEdge servers of generation 13.
From the Idrac overview/summary select Troubleshooting > Support Assist > Generate
or you can read this:
Please refer to Dell KB
How to export a SupportAssist Collection (TSR) via iDRAC?
RAID controller in Dell PowerEdge is set to "pass-through" mode for VxRail.