I have started to prepare a Windows 2008R2 cluster for use with SQL 2008 R2 clustering. I have 5 shared LUNS. I created the cluster and added all the LUNS to storage. I then installed MSDTC on one of the LUN and moved the quorum disk to another LUN. One thing I have noticed now is that 2 of my LUNS are in the available storage group while one of the LUNS is in a goup called 'Cluster Group'. I want to be able to use the 3 remaining LUNS for the SQL install. 2 are for the user databases (logs and db's) and the other one is for the system databases. I am new to shared clustering. Why is this LUN in the cluster group and why aren't the others there?