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What is the KTLS handshake limits of ONTAP?

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Applies to

  • ONTAP 9.13.1 and higher
  • KTLS

Answer

Starting in ONTAP 9.13.1, KTLS handshake limits are per node and are based on the number of cores:

Number of CPU cores KTLS handshake limit
1 to 2  50
3 to 6  90
7 to 14  130
15 to 30 170
31 to 62 210
63 to 126 250

Additional Information

  • Starting in ONTAP 9.16.x, a new new handshake deferral feature where, at the moment, the limit at which ONTAP will start to abort handshakes is effectively increased by a factor 4. 
    • Specifically, the handshake deferral queue size defaults to 3 times the concurrent handshake limit. 
    • 9.16.x also has the much faster handshake control plane which will support more concurrent handshakes across the board. 

 

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