phosphor-power-sequencer/docs/multiple_chassis.md

5 A BMC-based system can contain one or more chassis. A chassis is typically a
6 physical enclosure that contains system components such as CPUs, fans, power
12 For the `phosphor-power-sequencer` application, the term "single chassis system"
13 means the system type has a maximum configuration of one chassis. If the system
15 "multiple chassis system" even if the current system only contains one chassis.
19 ### System and chassis power state
21 In a single chassis system, the system and chassis power state are identical.
24 In a multiple chassis system, each chassis has its own power state. Even if the
25 system is on, an individual chassis may be off. This can occur if that chassis
32 If a single chassis system experiences a power good (pgood) fault, the system is
35 If a multiple chassis system experiences a power good (pgood) fault in one
36 chassis, the system will be powered off and then powered on again without that
43 If a single chassis system that was powered on experiences a brownout, the
44 system will be powered off.
46 If a multiple chassis system that was powered on experiences a brownout in one
47 chassis, the system will be powered off and then powered on again without that
54 If a single chassis system that was powered on experiences a blackout, the
55 system loses all power. It will be completely off until utility power is
59 If a multiple chassis system that was powered on experiences a blackout in one
60 chassis, that chassis loses all power. The system will be powered off and then