What you want to ask is what is the saf status of windows server 20 19 during the boot operation? As follows:

1.SAF represents the SecureBoot state during the startup operation of WindowsServer20 19. SecureBoot is a security function to protect computers from malicious software and malicious processes. In the SecureBoot state, the computer can only start the operating system and drivers verified by digital signature to prevent unauthorized code from running.

2. In WindowsServer20 19, SAF(SecureBoot Status) is a self-checking function at startup. When the computer is started, the motherboard will automatically check the integrity and credibility of the computer hardware and firmware. If all hardware and firmware pass the self-test, the system will enter the SecureBoot state. At this time, the computer can only start the operating system and drivers verified by digital signature, which improves the security and stability of the computer.