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NDMP Jobs failing with error : maximum number of NDMP processes (36) forked

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Applies to

  • ONTAP 9
  • NDMP

Issue

  • NDMP backups are failing with  the message maximum number of NDMP processes (36) forked
  • Example errors from the ndmp log:

ERROR: maximum number of NDMP processes (36) forked. Cannot accept connection from IP address: X.X.X.X port 55417 -- closing client [X.X.X.X].55417
ERROR: maximum number of NDMP processes (36) forked. Cannot accept connection from IP address: X.X.X.X port 50552 -- closing client [X.X.X.X].50552
ERROR: maximum number of NDMP processes (36) forked. Cannot accept connection from IP address: X.X.X.X port 53357 -- closing client [X.X.X.X].53357
ERROR: maximum number of NDMP processes (36) forked. Cannot accept connection from IP address: X.X.X.X port 40209 -- closing client [X.X.X.X].40209
 

  • On the backup application side, messages such as  server connection to file server...failed , or socket connection failed appear
  • While other backups are running, and new backups result in maximum number of NDMP processes or cannot accept connection errors, output of  command system services ndmp status will list nn number of sessions.

Note: The conditions for NDMP to reach the maximum number of NDMP processes can be transient -- As NDMP jobs complete and sessions are released, the number of active sessions may vary, depending on when the command is run.

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