Why does 'iostat -n' reports incorrect NFS client stats ?

Solution Verified - Updated -

Issue

  • Why does 'iostat -n' reports incorrect  NFS client stats ?
  • While copying a file from nfs mount to local disk , iostat -n shows exactly the same values for rops/s and wops/s . Ideally, wops/s should be zero and rops/s should report the actual reads. 

Output of ' iostat -kxn 2 | x.x.x.x ' , where x.x.x.x is the IP address of NFS server :

Device:         rkB_nor/s    wkB_nor/s    rkB_dir/s    wkB_dir/s    rkB_svr/s    wkB_svr/s    rops/s    wops/s
x.x.x.x:/test   0.00          0.00             0.00     0.00           0.00        0.00       0.42        0.42
x.x.x.x:/test   0.00          0.00             0.00     0.00           0.00        0.00       1.27        1.27

Environment

  • Red Hat Enterprise Linux 5
  • sysstat-7.0.2-3.el5_5 or lower versions.

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