diff -up nfs-utils-2.3.3/tools/nfs-iostat/nfs-iostat.py.orig nfs-utils-2.3.3/tools/nfs-iostat/nfs-iostat.py

--- nfs-utils-2.3.3/tools/nfs-iostat/nfs-iostat.py.orig	2020-12-10 10:38:26.462195326 -0500

+++ nfs-utils-2.3.3/tools/nfs-iostat/nfs-iostat.py	2020-12-10 10:45:47.210671473 -0500

@@ -380,6 +380,8 @@ class DeviceData:

         sends = float(self.__rpc_data['rpcsends'])

         if sample_time == 0:

             sample_time = float(self.__nfs_data['age'])

+        if sample_time == 0:

+            sample_time = 1;

         return (sends / sample_time)

     def display_iostats(self, sample_time, which):