If a large number of CIFS clients are experiencing temporary or persistent unavailability of the storage system, you might want to see if the ping throttling threshold has been exceeded for the storage system.
The resulting report lists the number of pings and ping replies that have been dropped, if any.
If the number of pings dropped, the number of ping replies dropped, or the number of both pings and ping replies dropped is greater than zero, you should increase the ip.ping_throttle.drop_value to a number that is higher than the current value.