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SnapMirror Transfer Pauses Randomly

I have four relationships between the same two ONTAP 8.3.2 clusters.  Three relationships update every 4 hours in an acceptible time frame.

One of the four starts transferring then pauses....  sometimes for 20-30 minutes... then continues... then pauses some more....

 

Over the course of the day the average time to complete the SLOW relationship is over 1 hour.

Average for the other transfers are all under 23 minutes.

 

Latest transfer stats:

 

Source:volA --> Dest:volA_mirror average bytes transferred is 743MB and takes an average of 26 seconds

Source:volB --> Dest:volB_mirror average bytes transferred is 22.6GB and takes an average of 22 minutes 6 seconds

Source:volC --> Dest:volC_mirror average bytes transferred is 5GB and takes an average of 1 hour and 9 minutes

Source:volD --> Dest:volD_mirror average bytes transferred is 12.6GB and takes an average of 4 minutes 30 seconds

 

All fours source volumes are on the same node/aggregate, all four destination volumes are on the same node/aggregate.

 

What could be causing 1 of the 4 to drag on for so long... some WAFL process, etc.??


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