Thanks for posting.
In the Admin Console > Database Server > Default Folders window you can add an additional database folder that sits on another drive. However, the limitation is that this additional drive cannot be a network drive.
Unfortunately, you can't configure the location of the FileMaker log files. However, you can go to the Database Server > Logging window and configure the Log size.
While the log files are currently larger than your databases, keep in mind that the 80 GB minimum/recommended system specs will take things such as the log files and backups into account.
Thanks, I really wish I could change the primary location of the database though. I did what you said months ago and it didn't seem to work so maybe this is a new thing with 9.... I haven't installed 10 year but I think that may be soon