this is all I get when I click the icon next to my cache drive:
Sep 11 14:44:02 Tower emhttpd: WDS500G3X0C-00SJG0_203123802818 (nvme0n1) 512 976773168
Sep 11 14:44:02 Tower emhttpd: import 30 cache device: (nvme0n1) WDS500G3X0C-00SJG0_203123802818
Sep 11 14:47:16 Tower emhttpd: writing MBR on disk (nvme0n1) with partition 1 offset 64, erased: 0
Sep 11 14:47:16 Tower emhttpd: error: mkmbr, 1967: Input/output error (5): write: /dev/nvme0n1
Sep 11 14:47:16 Tower kernel: print_req_error: I/O error, dev nvme0n1, sector 0
Sep 11 14:47:16 Tower kernel: Buffer I/O error on dev nvme0n1, logical block 0, lost async page write
I've also attached the diag, after attemepting to format the NVMe drive again after a reboot. I'm still having issues stopping the array again, though.
tower-diagnostics-20200911-1448.zip