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Adjust the migration speed

When you use the data migration service, you can adjust the migration speed. The migration speed sets the number of active users being migrated at a time.

You must be signed in as a super administrator for this task.

Before you begin

To access the Data migration tool in the Admin console:

  1. Sign in to your Google Admin console.

    Sign in using your administrator account (does not end in

  2. From the Admin console dashboard, go to Data migration.

    To see Data migration, you might have to click More controls at the bottom.

Adjust the migration speed

To adjust the migration speed, click Settings  More > Adjust migration speed, and use the slider to adjust the number of simultaneous requests the data migration service makes to your legacy server. Then click Apply

The number of users being migrated with the data migration service equals 2 x the migration speed. For example, if the migration speed is set to 50, the data migration service processes 100 users at a time.

A higher number increases the speed of your migration. It also increases the load on your mail server, which can slow performance.


  • Set the migration speed to half the number of users that you are migrating. For example, if you're migrating 100 users, set the migration speed to 50.
  • Otherwise, leave the migration speed at the default value, which is 25.
  • Don't select a migration speed that's bigger than half the number of simultaneous requests that your server can handle. Doing so could put too much load on your legacy mail server. 
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