Hi Reuben,
Thank you for sharing the serial number.
So, I see the node was halted back in July 29,2018 and ever since disk 00.0 is in missing state.
I would suggest to pull out the disk 00.0, wait for 2 mins, insert the disk and see if it comes online. It it does not, then you should be looking for a replacement.
Regards,
Aman