What is the optimal target transfer rate for my network?


The target transfer rate is the speed at which your transfers attempt to run, as well as the limit of your transfer speeds--transfers cannot run faster than the target transfer rate.

Transfer speeds are determined by a number of factors, including:

  • Your network and bandwidth capacity
  • Your storage (disk read/write speed on the client and server)
  • Configured transfer policies

The FASP protocol allows you to test the conditions of your network in addition to providing dynamic, high-speed transfer capabilities. After having tested your network and set appropriate transfer policies, you will be able to configure a target transfer rate that optimizes the performance of your transfers.


1. Configure recommended server policies

How you configure transfer policies on your server can have a big impact on transfer performance. In general the default transfer policies are recommended for optimal transfer speeds.

For an in-depth look at these policies and why they improve transfer performance, see the following article:

2. Test your network capability

You can use the ascp command line tool to determine the transfer speeds that are possible on your network--and whether you may have hindrances to your transfers such as network congestion or slow storage.

The following articles describe in detail how to test your network with ascp:

3. Configure your target transfer rate

If you have not run into problems performing the network tests, you will know what your target transfer rate should be based on the results.

Note that in some cases you may have other non-Aspera traffic on the network that may be sensitive to congestion (like VoIP). In this instance it may to not be advisable to set the transfer rate to the full capacity of the network. Simply setting the transfer rate below the full capacity isn’t quite sufficient, as multiple transfers occurring simultaneously would attempt to reach the transfer rate if there is bandwidth available.

Instead, it is recommended to configure a Vlink, which is an aggregate bandwidth cap applied to transfer sessions. Setting the Vlink to a value somewhat below the full network capacity would limit all transfers to this cap and leave some “breathing room” for the other sensitive traffic. For more information on Vlinks, see the following article:

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