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FAQ about the SnapMirror throttling options

  1. Last updated
    Jan 3, 2025
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snapmirror
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Last Updated:
1/3/2025, 9:53:15 AM

Applies to

  • ONTAP 9
  • SnapMirror

Answer

Q1: How to reset the values of the following options?

replication.throttle.incoming.max_kbs  786432   -
replication.throttle.outgoing.max_kbs  38400    -  

A1: Once the values are set, they cannot be reset to the initial state "-" , but set the values to 0 or unlimited is changed to default values which is the same as "-".

::> options -option-name replication.throttle.incoming.max_kbs 0
or
::> options -option-name replication.throttle.incoming.max_kbs unlimited

 

Q2: Are the values of replication.throttle.incoming.max_kbs and replication.throttle.outgoing.max_kbs ignored when replication.throttle.enable is set to off?

A2: Yes.


Q3: Is the following understanding correct regarding the parameters?

replication.throttle.incoming.max_kbs: Limits the incoming bandwidth when the cluster is a SnapMirror destination.
replication.throttle.outgoing.max_kbs: Limits the outgoing bandwidth when the cluster is a SnapMirror source.

A3: Yes.


Q4: What is the communication bandwidth when the source cluster performs SnapMirror to both Destination Cluster 1 and Destination Cluster 2 with the following parameters?

Source cluster outgoing: 38400 KBps
Destination Cluster 1 incoming: 1048.576 Mbps
Destination Cluster 2: No throttling


A4:

  • Source cluster's maximum outgoing bandwidth is limited to 38400 KBps, which is approximately 307.2 Mbps (38400 * 8/1000).
  • Destination Cluster 1's incoming bandwidth is limited to 1048.576 Mbps.
  • Destination Cluster 2 has no throttling, so it is unlimited.
  • The transfers from the source to Cluster 1 and Cluster 2 will not exceed 307.2 Mbps at the same time.


Q5: What is the communication bandwidth when the source cluster performs SnapMirror to both Destination Cluster 1 and Destination Cluster 2 with the following parameters?

Source cluster: No throttling
Destination Cluster 1 incoming: 1048.576 Mbps
Destination Cluster 2: No throttling

A5:

  • Source cluster has no throttling, so the outgoing bandwidth is unlimited.
  • Destination Cluster 1's incoming bandwidth is limited to 1048.576 Mbps.
  • Destination Cluster 2 has no throttling, so it is unlimited.
  • Actual bandwidth may vary based on network conditions and system load.

Additional Information

 

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