SNMP request timeouts when NFS share on remote server is hanging.
root# snmpwalk -v2c -cpublic localhost
Timeout: No Response from localhost
A feature called skipNFSInHostResources was added to skip NFS mounts from filesystem lookup to prevent issues in case the remote resource is not available, from manpage of snmpd.conf:
controls whether NFS and NFS-like file systems should be omitted from the hrStorageTable (true or 1) or not (false or 0, which is the default).
If the Net-SNMP agent gets hung on NFS-mounted filesystems, you can try setting this to ‘1’.
The solution is to add the following entry “skipNFSInHostResources true” in /etc/snmp/snmpd.conf and restart snmpd service.