
Examples of firmware that implement these specifications are AMI Aptio, Phoenix SecureCore Tiano, TianoCore EDK II and InsydeH2O. They define the architecture of the platform firmware used for booting and its interface for interaction with the operating system. UEFI ( Unified Extensible Firmware Interface) is a set of specifications written by the UEFI Forum. They can use different I/O protocols, but SPI is the most common. DRS in Maintenance Mode is a separate feature entirely and this prompt can be safely ignored.The UEFI implementation is usually stored on a NOR-based EEPROM that is located on the mainboard.

VSphere Enterprise Plus licenses include the DRS and Maintenance mode capabilities. These rules are used to automatically move the VMs back to the original host when it exits maintenance mode

When you perform a major upgrade in vSphere, the installer triggers a short Evaluation mode that provides customers time to login to the Customer Connect portal and update license keys. Major upgrades (from 6.x to 7.x) do require license key upgrades. VSphere upgrades from 6.5 to 6.7 or 7.0 to 7.0 U3 are considered “point upgrades” and do not require license key upgrades Maybe it will help a few others along the way… vSphere License Keys and Upgrades This made me dig into my memory banks a bit and I wanted to document it so I would remember. They received a warning that the DRS in Maintenance Mode feature was not supported with their vSphere Enterprise Plus license. When they applied these license keys to their vSphere hosts They had just upgraded their licenses in the VMware Customer Connect portal.


Their VMware vSphere environment upgrade was complete. I was helping a customer with a question they ran into after upgrading from vSphere 6.7 to 7.0 U3.
