> Can you leverage your OS to re-assemble the two LUNs into one 4 TB 
device?
> 
> Solaris - SVM/DiskSuite or ZFS
> Windows - Dynamic Disk
> Linux   - LVM volume

Can I? Yes. Will I? Not if I don't have to ... 

If there is a problem with one LUN, the whole disk becomes inaccessible 
(at least under Windows, probably with the other Oses). With 2 separate 
LUNs, it is still possible to write to/recover from the non-problem LUN.

"Dynamic Disk" is a lot like RAID-0, which I am always against, except for 
things like scratch disks.

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