How to add a SAN disk to existing Cluster / Instance.

Hello There,Frist of all, I know some people posted about it, but I really can't fix it.I have a Cluster SQL working, also in that SQL we have two instances, now we're going to do a massive charge of documents in Sharepoint, so we decided to add a new disk.I added the disk correctly to the MS Clúster, and both machines can saw it, (Is an A/P Cluster), but the SQL didn't detect it.I tried to run the Instalation setup again, but I didn't find the right option, and my disk is in the MS clúster, but not in the SQL one.Any clue will be apreciated.Thank you very much.

Take the SQL service offline and add the NEW disk to sql depencies to see SQL through cluster admin.
http://sql-server-performance.com/Community/forums/p/2606/14808.aspx#14808

Wow it worked!
Dindn't though was so easy.
Thanks a lot