Skip to main content
NetApp Knowledge Base

How to increase the TCP receive window buffer size for Inter-Cluster and IntraCluster Volume SnapMirror

Views:
981
Visibility:
Public
Votes:
1
Category:
ontap-9
Specialty:
core
Last Updated:

Applies to

  • ONTAP 9
  • Clustered Data ONTAP 8

Description

Inter-Cluster and IntraCluster SnapMirror uses the network service named ctlopcp

  • The ctlopcp service has a tunable TCP receive buffer window for Inter-Cluster and IntraCluster connections.
    • The Inter-Cluster TCP receive buffer window defaults to 2 MB, the IntraCluster TCP receive buffer window defaults to 256 KB.
    • The TCP receive buffer windows can be increased up to 7 MB, and can be decreased to 256 KB.
  • Increasing the Inter-Cluster TCP receive buffer window can increase the effective throughput when working with high-capacity WAN connections.
    • However, this may not be necessary due to the increased number of active TCP streams used for replication.
    • For more information, see Section 2.4 "Network Connections for Inter-Cluster SnapMirror" in TR-4015.
  • Inter-Cluster TCP receives buffer windows auto-tune by default.
    • These start at 64KB per TCP stream and grow to a maximum of the configured value (default 2MB) to accommodate InterCluster replications.
    • Once grown, the receive buffer window does not shrink as long as the TCP stream remains open.

 

CUSTOMER EXCLUSIVE CONTENT

Registered NetApp customers get unlimited access to our dynamic Knowledge Base.

New authoritative content is published and updated each day by our team of experts.

Current Customer or Partner?

Sign In for unlimited access

New to NetApp?

Learn more about our award-winning Support