We have Windows shares mounted as CIFS filesystems on RHEL5 servers running Oracle DBMS, e.g.

df -P|grep -E -e cifs -e Filesystem

Filesystem 1024-blocks Used Available Capacity Mounted on //windows.nowhere.com/oracle 1098613024 887737788 210875236 81% /windows.cifsxport

These become non-functional somewhat randomly on individual servers, which we usually find out about when the Linux box goes purple because the "df" for the disk test has hung.

I can exclude CIFS using df options to avoid the hang, but then I won't get any warning at all unless I find a better way to check the mounts. Suggestions?