Every user in GCE has a home directory. Your home directory is only for you. There are no shared files or directories. It’s a place to store private config files and personal documents. The default quota is 20GB. CELS users may request additional quota.
Project directories are designed to be shared. It’s a place to store data for you and others in your project. This is where you can work on code you check out, analyze data and results, etc. By default, project directories are set up such that all members of the project can read and write files and directories to the space. The default quota is 100GB. CELS users may request additional space.
Requests for additional space on either of the above are decided on a case-by-case basis, and depending on the amount needed, you or your project may be asked for a project code.