Since we identified that even new clients cannot write to the /nfs share, we have at this point narrowed down that the issue is likely on the server side and not the client.
Earlier, while troubleshooting the NFS server, we checked almost everything that there is to check about NFS. We validated that the service is in fact running, accessible by the clients, that the data in /etc/exports is correct, and that the currently exported directories match what is in /etc/exports. At this point, there is only one place left to check: the log files.
By default, the NFS service does not have its own log file like Apache or MariaDB. Instead, this service on the RHEL systems utilizes the syslog facility; which means our logs will be within /var/log/messages.
The messages log is a very frequently used log file for Red Hat Enterprise Linux based Linux distributions. In fact, by default, outside of cron jobs and authentication, every syslog message above the info log...