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Slow SnapMirror Initialization or transfer from a FAS system

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Applies to

  • Any FAS system with HDDs
  • ONTAP 9.7, 9.8P5 or 9.9.1P1 or older
  • SnapMirror

Issue

  • Slow SnapMirror initialization is seen
  • Poor throughput is seen, especially after hours into the transfer
  • The transfer may take hours or days

Example: An initiated Snapmirror from an on-prem FAS to AWS transfers only 3.7 TB in 30 hours

Cluster::> snapmirror show -destination-path 
Source            Destination  Mirror  Relationship  Total             Last
Path        Type  Path         State   Status        Progress  Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
srcsvm:vol1  XDP  dstsvm:vol1 Initializing
                                      Transferring 
                                                      3.78TB   True    05/28 04:20:34

 

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