How to Migrate Large Site Collections to sharePoint Online

How to  Migrate Large Site Collections to sharePoint Online

1. A site collection is made up of one top-level site and sites beneath it. 
2. A site having more than 100 GB is considered as large sites in SharePoint. 
3. SharePoint Online supports larger site collections but for better performance and maintainability it’s recommended to limit the size of sites/site collections.

Issues:

Any site collection that grows beyond 100GB will have performance issues and affect bulk

operations such as copying /moving files and sites, updating lists or libraries schema, etc.

Recommendation:

Divide the large site collections into multiple site collections or archive the old content before migration.

I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.