How can I avoid reaching Google throttling limits during my migration?
Google has strict throttling limits. If these limits are reached, it could result in the account being locked out for 24 hours, which may negatively impact your migration plan.
Important: During migrations, MigrationWiz connects to Google (G Suite) endpoints using OAuth 2.0. This allows administrators to grant access to MigrationWiz at an organization level, rather than requiring each individual user to grant MigrationWiz access to their inbox. We have also noticed that Google may be a bit more relaxed about enforcing the data transfer limits than are found here: G Suite Bandwidth Limits.
When migrating from G Suite, you should refer to the migration guide that matches your scenario. Migration guides can be found here, under the Mailbox migration section. Each guide includes steps to filter out the All Mail folder until the last pass. By following the steps in the guides, you will not be affected by the issues below.
The main limit to be aware of when performing migrations from G Suite is of folders in a mailbox containing too many items.
- Issues can occur when you are migrating folders that contain over 100,000 items. Note that the All Mail folder can reach this size.
- If you try to migrate the All Mail folder in one pass, you may hit Google throttling limits. The best way to avoid this issue is to migrate in stages, as directed in the migration guides.