Does anyone have experience taking a 32 bit cluster and upgrading it to 64 bit? I would like to just upgrade the OS to 64 bit without reformatting and installing from scratch. In the past when I have upgraded a machine's OS, it hasnt' worked all that well. My cluster has 3 nodes and runs Windows 2003 enterprise. I have the Intel 32/64 bit chips. I would need to upgrade the OS to 64 bit, then upgrade SQL to 64 bit correct? Any info or ideas would be appreciated. Thanks.