How do I extend the size of a SAN

Hi guys, I've just got myself a DS3400 SAN storage along with SAN24B switch. I can't find anyway to increase the capacity of a LUN which has already been assigned to a Windows 2003 server. For example, the size assigned is 200gb, I need to increase it to 250gb. May I know how to go about doing it?
totallypatrickAsked:
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ComputerTechieCommented:
Backup Data
Delete LUN
Recreate LUN
Restore Data

CT
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totallypatrickAuthor Commented:
I believe there are some command that can be done from the command line?
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andyalderSaggar maker's bottom knockerCommented:
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