I just bought a new DELL R710 with 2TB of internal storage (RAID 5). When I created my first datasStore, I specified 1024GB (1TB). Once I went back to the summary page, I noticed the capacity was set to the default of 277GB. So, I deleted that DS and created a new DS accepting all the defaults. I have now moved most of my VMs to DS01, now it is almost full. I went in to create another dataStore, however I don't have the ability to select my LUN. So I can't create another dataStore.
Here is what I am doing;
1. Click "Configuration" tab
2. Click "Add Storage"
3. Select "Disk \ LUN"
4. I get a screen with a blank RH panel (See screen shot attached)