How to fix R730xd error CBL0009 Backplane 1 connector A1/B1 is not connected

I think this is more of a problem if you are doing a R730 to R730xd swap like I did.  Although changing RAID controllers may also trigger this error.  The fix is surprisingly simple fortunately. You can go into the idrac web interface and modify the enclosure settings. If you are only running a single controller the enclosure needs to be set in unified mode.

Resources:
https://www.dell.com/community/en/con...

https://www.dell.com/support/manuals/...