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SnapMirror relationships hang in transferring on ONTAP 9.4 through ONTAP 9.6

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Applies to

  • ONTAP 9.4 through ONTAP 9.6, inclusive
  • SnapMirror 

Issue

  • SnapMirror relationships hang in a transferring state after moving a small amount of data. 
  • This issue occurs when ALL of the following are true:
    • The SnapMirror source cluster is running ONTAP 9.4 through ONTAP 9.6, inclusive. This issue does not impact ONTAP 9.7 and later.
    • SnapMirror global replication throttles were enabled on the SnapMirror source cluster when the issue began.
      • SnapMirror global replication throttles can be viewed through the options replication.* command on the source cluster.
    • This issue impacts specific SnapMirror source nodes.
      • The hung/stuck SnapMirrors may have a specific source node in common while SnapMirrors from other source nodes in the same cluster may behave normally.
      • In some cases, all source nodes in the cluster can be impacted.
    • In the SnapMirror source node's EMS logs, located at/etc/log/EMS, messages such as the following example will appear:
      Tue May 01 00:00:00 [ClusterA-01: repl_Handle_reg: repl.xfer.term.timed.out:error]: A component of a replication transfer with destination volume DSID '1234' or SnapMirror(R) tape ndmp session '' is taking a long time to terminate since it is busy performing some operation.
    • In the SnapMirror source node's SKTrace logs, located in /etc/log/mlog/sktrace.log, messages such as the following example will appear:
      2019-05-01T00:00:00Z 34159448880650904 [5:0] REPL_0: repl_sender::NodeFactory::abortOrphanSenderNodes(): | Clearing orphan sender node with transfer uniq: 012345678-0123-0123-0123-0123456789ab
  • Before applying the solution in this KB, ensure that all of the above criteria are met and that matching error messages have been found. 
    • There are many issues, manifesting in various ways, that can result in SnapMirrors appearing to hang.
    • If a similar issue is encountered, but the cause is unclear, open a case with NetApp Technical Support.

 

 

 

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