Hi All, We have SQL Server 2005 cluster setup as follows: 3 node active/active/passive cluster with 1 instance on node1 and 5 instances on node3.node is passive. Active(node1) Passive(node2) Active(node3) INS1 INS2 INS3 INS4 INS5 INS6 Node1 has drives Node3 has drives C-> OS INS2-> G->primary D->Primary H->log ]Group2 E->secondary T->tempdb F->log ]group1 Q->quorum S->tempdb INS3-> I->primary Y->msdtc J->log ]group3 Z->backup U->tempdb INS4-> K->primary L->log ]group4 V->tempdb INS5-> M->primary N->log ]group5 w->tempdb INS6-> O->primary p->log ]group6 R->tempdb Group1,2,3,4,5,6 are groups in cluster administrators. Here are the Issues: 1.The drives of node1 are also showing up in node3?(happend after doing some upgrade in SAN)->major issue Is this Normal behaviour??and the drives of nod1 in node3 are not accessible? 2.If want to install more instances like instance7 we have no drive letters to assign? 3.How can we install 26 failover instances if we have this drive letter conflict?