iSCSI Volume Extending

Hello. I have an iSCSI connection between my laptop and EX2 for virtual machines. I want to extend the volume a little bit, but the all is grayed out when I change the volume size.

What is the correct way to extend the volume without loosing data?

Thank you.

Perhaps it would be best to contact WD Support about this. You can do so over the phone or via E-mail.

Thank you. I would email, but your support site does not like the serial
numbers that I use.