What will happen to the accounts in home directory in case that exceeded the disk limit and there is a second home drive

Hello, I have added disk storage home2 as a second drive and that reflected on Cpanel, now I want to understand this scenario: "home" disk space -> 50 GB "home2" disk space -> 100 GB What will happen to an account on "home" directory when exceeds 50 GB ? Will I need to move it to "home2" or the whole space between the two drives will be shared ? Thank you,