I tried doing this, if you have a striped LUN from the Array, the best solution is that, you map a bigger LUN on to the server and then trying copying or migrate the data from old smaller LUN to newer LUN, in simple words HOST COPY.  The reason why, when you increase a striped LUN there is a chace of corrupting the data on it ( I may be wrong but it happened to me, data on my LUN simply went blank and i had to restore it using my backup). The best way to increase a striped LUN is if you have mirror view configured , then your work is done pretty simple. Even if something goes bad, you can sync it up from you Mirrror view copy Regarding Concatenated LUN, I havent done any expansion, but if I am not wrong its pretty straight forward. You can increase it whenever you want.  Thank You Rama
I would like to increase three hard LUNS but don't know how it will affect the cluster administrator. Here is my problem: I have an exchange 2003 cluster that is using three SAN Drives. I want to increase their size.  All LUNS are stripped. Is there a benefit to use migrate or expand. How can I do it properly and how to have windows cluster recognize the new sized drives?   Thanks for your help.  Jesus Hernandez isjh0[NAME].edu
Expanding a drive best practices