Hi, We are designing a 3 node SQL 2008 R2 cluster to host 2 SQL instances. I have a question on SAN drive presentation. Suppose we have NodeA, NodeB, and NodeC. We want to have NodeA host Dev1\Instance1 and NodeB host Dev2\Instance2. NodeC will host Dev1\Instance1 and/or Dev2\Instance2 when NodeA and/or NodeB are down. We don't want NodeA to host Dev2\Instance2; and we don't want NodeB to host Dev1\Instance1. Dev1\Instance1 uses only SAN drive M: while Dev2\Instance2 uses only 1 SAN drive N: At the OS leve, does SAN drive M: need to be presented to NodeB and SAN drive N: need to be presented to NodeA? Thanks.