Issue Description
The system reported input/output error when a share was mounted using the mount -t nfs -o vers=3 ip:/share /dir command.
Alarm Information

Handling Process
Engineers ran the service portmap status command and found that the RPC service was stopped. After the service portmap start command was run, the service became normal.
The system log recorded an error reported by the RPC service. After the RPC service was restarted, the share was mounted successfully.
Root Cause
RPC was not enabled for the system, resulting in an NFS access error.
Solution
Run the service portmap start command to restart the RPC service.
Suggestions
You can use the service portmap status command to check whether the RPC service is started.