
Redundant Host API
The following topics specify each of the interface functions.
6.2.1Definitions and Types
The following definitions are provided for terms used in the remaining topics of this chapter.
RH (Redundant Host) System. An RH system consists of two or more hosts and one or more domains. An ownership relationship is defined between hosts and domains: hosts own domains. At any given moment of time, no more than one host can own one domain. If a host owns the domain, software on the host has access to PCI devices in (or behind) the PCI slots of the domain.
RH (Redundant Host) Infrastructure. An RH Infrastructure is an implementation of the Redundant Host PICMG 2.12 APIs for a specific RH System. It provides the Redundant Host API defined in this topic to applications. Multiple RH Systems of the same type may be serviced by a single infrastructure.
Domain. A Domain is a specific collection of peripheral PCI slots whose ownership can be transferred as a group among system hosts.
Host. A Host is an active entity in the system that can run software that uses this API. Hosts in the system are identified by
Domain parent bridge. A
Domain slot path. The slot path for a PCI device is the sequence of device/function numbers from this device up the PCI tree to its root through the sequence of
Switchover. Switchover is changing ownership of a domain from one host to another.
Destination Host. This is the host that receives the specified domains owned by a particular host if a
Available Host. A host is available if it can own domains and communicate with the rest of the RH system. A host is unavailable, for example, if it is switched off or is in some special mode in which it is isolated from the rest of the RH system.
Owning Host. The host that currently owns a domain.
Current Host. The host on which the specific API call has been made.
Root Bus. The root bus number of the PCI tree this slot belongs to. This value is 0 for the first or a single PCI tree. For additional PCI trees, this value is
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