Unable to increase iscsi target disk space

I am trying to increase the disk size of my iscsi target from 400GB to 700GB. However, there was an error message indicate that I can’t increase more than 400GB. I have checked that I have over 500GB of available disk space in the dashboard. Please help!!!


You could refer to the following link: https://support-en.wd.com/app/answers/detail/a_id/3864