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Got the answer : As iostat command was missing it gave wrong output ! # apt-get install sysstat Got output on Nagios after installing sysstat : IO-Stats /dev/xvda OK 08-19-2015 14:28:10 43d 8h 7m 28s 1/4 OK - I/O stats tps=2.00 MB_read/s=0.00 MB_written/s=0.00 IO-Stats /dev/xvdb OK 08-19-2015 14:26:48 61d 4h 47m 46s 1/4 OK - I/O stats tps=0.00 ...



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