OK, now that is concerning. Two of my six 10TB drives are now converting at around 25% and counting. No errors on these two. However, for those waiting for initialization, the log file is flooded with the following error:
Warning: 0 : [ApiHttp:148] Server is temporarily unavailable due to either high load or maintenance. HTTP protocol exception (Code=ServiceUnavailable).
Default API settings, no unmounting errors for now