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Oracle ZFS Storage Appliance : TCP Flow Control and Congestion Control (Doc ID 2252566.1)

Last updated on FEBRUARY 13, 2024

Applies to:

Oracle ZFS Storage ZS4-4 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-2 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-4 - Version All Versions to All Versions [Release All Releases]
7000 Appliance OS (Fishworks)


The majority of Oracle's ZFS Appliance customers using NFS have a large number of clients accessing the appliance over the network.

In some cases one or two clients with single threaded applications must read huge amounts of sequential data over a high speed link.

One example of this would be video data where the appliance is being utilized in the Media and Entertainment Industry.

In some circumstances the read performance may not meet the customer's expectations. Some actions can be taken to increase the performance.


Versions of appliance software below 2013.,1-1.2 have a congestion window set to 5. The congestion window is the number of packets that can be on the wire to the client.

In ak version 2013.,1-1.2, the constant was increased from 5 to 16 decimal. Upgrading to the newer release can increase throughput on a network where there is some packet loss.


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