New SharePoint Online and OneDrive for Business Azure Migration API
SharePoint Online and OneDrive for Business migrations each have two endpoint types:
SharePoint and OneDrive for Business endpoints use the legacy CSOM API. SharePoint Online v2 and OneDrive Pro for Business v2 use the new SharePoint Online Azure Migration API, which does not throttle or block migrations, as CSOM API does when exceeding throttling limits, and is definitely faster. Since Microsoft plans to begin throttling CSOM calls more and more, migrations that use CSOM endpoints will become slower than they are today.
The new SharePoint Online Azure Migration API has completely changed the way migrations are done, which directly impacts the migration speed (with a performance increase ranging from 2 to 10 times faster) and the number of concurrent migrations (migrations won't be throttled or blocked anymore). An important difference of the new API is that it leverages Azure Storage as a temporary holding place for the data being migrated. Therefore,
when creating the endpoints in MSPComplete or in MigrationWiz, you have to provide an Azure Storage account and its primary access key. If you don’t already have an Azure Storage account, you can register and purchase it, or use a free trial by clicking on this
link. The location of your Azure Storage should be the same location as your tenant,
to reduce the processing time of data ingestion into SharePoint Online.
During the migration process, the v2 connectors now create two unique Blob Containers. The first is the one into which the Source files
will be migrated, while the second is used for a package containing the migration instructions that Microsoft is to follow during the import.