iSCSI, no device extent shown?

[silver565]

Hi Guys

I'm trying to setup an iSCSI target. The idea is to share a whole disk. I've tried to share a 2tb Disk(Raid1), however it doesn't show up under the "add extent" option.
I've been following this walkthrough:

http://www.youtube.com/watch?v=p97Yg7u8fSk

I assume you can't share a mirrored setup?