Here is some info that i have collected from browsing the web when looking for DS3000 information.

Expanding LUNs on a DS3000 series disk system:

First make sure you have enough space in your array. Next go to the script editor in the Storage Manager gui. Choose script editor. Type in a command like this:

set logicalDrive ["FINKOPAS01-BOOT"] addCapacity=50 GB;

This would add 50GB’s to the disk “FINKOPAS01-BOOT”.

Now choose run command from the menu. After the disk system has expanded your LUN you should see the extra capacity in the disk management console window.

*NOTE*: This information was originally found here: http://www.systemx.co.nz/xcelerator/?q=node/99
*NOTE*: Found out that in later versions of the DS3400 firmware you have to add a space between the capacity you want to add (the number) and GB….IE: set logicalDrive ["FINKOPAS01-BOOT"] addCapacity=50 GB; instead of set logicalDrive ["FINKOPAS01-BOOT"] addCapacity=50GB;. Thanks for pointing it out!