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On a system with more than one copy of ESX Server installed, or where multiple installations are visible, such as on a SAN, the first installation encountered will be upgraded. While upgrading, take special care to choose the correct drive, master boot record (MBR), or SAN LUN on which to install/upgrade ESX Server. In the case where multiple installations exist on a SAN, you can also mask off the SAN LUNs corresponding to the installations that you do not currently want to upgrade.