Great article Perry. I have a question about adding a new instance to a SQL failover cluster. I created a 2-node test environment using Srv 2008 R2, Windows Clustering and SQL 2008 R2 Ent. I followed your article closely and I was able to create the empty application (let's call it WebProd Storage), add the storage and dependencies, create mount points under one drive letter for the application. My question is when I am ready to install a new instance (let's call it WebDev), can I use the existing WebProd drive letter and mount some additional volumes or do I have to have a dedicated empty application for each instance I install, thus another drive letter and mount the new volumes under it?