Intel ZT 4901

60 High Availability Software for the Intel® NetStructureTM ZT 4901 Technical Product Specification

Redundant Host API

OwningHost The number of the host that currently owns the domain this device

belongs to

RootBusNumber The PCI bus number of the root bus of the PCI hierarchy the device

resides in; is 0 for single-root PCI hierarchies. This value is 16 bit to

accommodate possible future extensions to PCI that allow more than 256

PCI buses in the system.

SlotPath The slot path from the root bus to the nested device. The slot path is

stored as a null-terminated sequence of two-character groups. Each

group describes one item of the slot path and represents the number

(DeviceNumber * 8 + FunctionNumber) for the corresponding PCI-PCI

bridge in hexadecimal. The two hexadecimal digits of this number are

represented by two characters from the set ‘0’..’9’, ‘A’..’F’.

BusNumber The bus number for the device. This value is 16 bit to accommodate

possible future extensions to PCI that allow more than 256 PCI buses in

the system.

DeviceNumber The device number for the device

FunctionNumber The function number for the device

Device configuration attributes (all based on PCI configuration space attributes of a PCI device

nested within the slot):

VendorID/DeviceID/RevisionID

Identifies the manufacturer of the device that provides a nested PCI

interface within the slot, the specific device product among those made

by that manufacturer, and the revision level of that device.

SubsystemVendorID/SubsystemID

Identifies the manufacturer of a subsystem nested within the slot (say, a

PMC module) and the specific subsystem product among those made by

that manufacturer.

BaseClass/SubClass/ProgIF

Identifies the type of nested PCI device and its programming interface

HeaderType Identifies the layout of the second part of the pre-defined header of the

nested PCI device (for example, 0 for a conventional PCI device, 1 for a

PCI-PCI bridge.

The field NeedsReset indicates whether this device in its current state needs to be reset if

switchover takes place. The value RESET_NOT_REQUIRED in this field means one of the

following things:

•The device is already prepared for switchover.

•The device is not in use.

•The driver for the device is switchover-aware and is able to correctly bring it into a safe state

after the switchover.

The value UNKNOWN means that the infrastructure does not know whether the device needs reset

or not.