As far as I can tell, the VM Client interface simply does not work as described in the ESX Server 3.5 administration guide where it shows a screen shot of the add storage wizard with an option to use the unused portion of the disk for the new datastore. When I ran add storage wizard the first time, I saw the 680 GB RAID5 drive and selected to use only 200 GB. According to the documentation I should have seen the remaining disk available for additional datastores. It does not appear. The additional datastores must be created manually from the service console. VMWARE and Dell tech support confirmed the following solution:
From the service console use fdisk /dev/sdb to create new partitions (in my case partitions 2 and 3 as primaries, 4 as extended, then 5,6,7 and 8.)
Then vmkfstools -C vmfs3 -b 4M /vmfs/devices/disks/vmhba1/:1/:0/:2 (then repeat with :3 thru :8, skipping 4) (Not sure why they selected 4M block size, none of these partitions are over 256GB)
then vmkfstools -V
Then in the VM Client after rescanning from configuration/storage adapters, the new datastores already appear in the storage window and can be renamed as needed.
