 This is what I usually go with;   1: Turn off all other cluster nodes completely. 2: Disable the Cluster Service on the node that is still up and will be upgraded. (Do not stop the service as it will then be re-activated after a reboot. Disable it). Done in services, via Computer Management. 3: Disable cluster disk driver. Done in device manager. Click view, select: show hidden devices. Expand: Non-Plug and Play Drivers. Disable: Clusdisk. 4: Reboot the host. 5: Upgrade PowerPath to the version needed 6: Put Cluster service back in Automatic mode 7: Enable cluster disk driver 8: Reboot the Host 9: Verify all cluster disk resources come online in cluster admin  Please follow the document: PowerPath for Windows Installation and Administration Guide 5.3, on the ftp as a guide to upgrade PowerPath.     
Hi All,  I would like to upgrade PowerPath on Microsoft Cluster Servers.  Can I simply remove PowerPath software on standby node and then install new version PP?  or need to do following:  1. shutdown one node for backup purpose 2. stop cluster service and stop cluster disk driver (by device manager) on another node 3. reboot  4. remove old PowerPath 5. reboot 6. install new PowerPath and then enable cluster disk driver 7. reboot 8. start cluster service and check everything is fine 9. shutdown 10. do the same thing on remainding node   Thank you for any input. Dennis
How to upgrade PowerPath on Microsoft Cluster ?