Map allocated space from Storage device to existing partition
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In my limited knowledge this could be tricky if you want to keep your existing data on that 600G partition intact.
You should be using LVM for this type of as its very easy to extend, shrink and add more capacity to partitions as your needs grow.
What file system do you have currently on that 600G partition?
One way out of this may be to boot into a rescue CD and with parition magic extend your partition, although you may have issues getting these mounted in that environment.
Short answer: you can't. What you can do is dump/tar the filesystem, build a new LVM2 volume group from the two LUNs, then carve out a logical volume of the desired size and restore the data you backed up.
The lazysystemadmin and RH URIs are not relevant in your case. Those are referring to a LUN that's been resized on the back end. You, instead, have two separate LUNs.