Notes

Audio Cable Adapter
As defined by the PCI specification, the bottom address registers define the beginning point of the I/O and reminiscence addresses that every adapter has been allocated in system memory. Also, outlined by the PCI specification, an adapter can have up to six BARs. It is up to the adapter vendor to implement one or more BARS within the adapter for I/O or memory addressing, as desired. According to the PCI specification, each of the six BAR entries in an adapter's configuration house is identified as to its resource kind (bit zero indicates whether or not this BAR describes a reminiscence area or I/O space).
After following the standard initialization process of an adapter, a snapshot is taken of the configuration house for each adapter of the PC buses 241 and 256 (FIGS. 2 and 3). The snapshot of the configuration space for each adapter is used to construct a template which is included into the configuration manager 1100. The NPA_Config routine additionally determines if all pending requests have been processed or not. At state 1014, the Filter CDM 513 starts a counter. The Filter CDM 513 makes use of this counter to establish whether the mass storage adapter 102 is malfunctioning as might be explained below. The Filter CDM 513 queries the NPA_Config routine to search out the number of excellent I/O requests to a specified mass storage adapter .
The process described by FIG. 8 is generic to varied implementations of the invention. For occasion, the process proven in FIG. 8 may be utilized by a fault tolerant computer system 100 shown in FIGS. The following description of FIG. 8 focuses on the hot swap of an adapter 310 beneath the NetWare Operating System.
The adapter devices 238 and 240 are electrically and mechanically linked to the PC buses 234 and 236 by PC slots similar to slot 241. Hence, an adapter is “plugged” right into a slot. In one embodiment of the invention, each slot may be independently powered on and off.
First, a course of for warm add and swap of an adapter under the NetWare Operating System might be described according to the processes proven in FIGS. Second, a process for decent add and swap of an adapter 310 beneath the Windows NT Operating System environment shall be described according to the processes proven in FIGS. thirteen is a flowchart illustrating one embodiment of a process by which a loaded adapter driver of FIG. 12 initializes itself with the configuration manager beneath the Windows NT Operating System. 6 is one embodiment of a flowchart illustrating the process by which a user performs a sizzling add of an adapter in the fault tolerant laptop system, proven in FIG. 5 is a block diagram illustrating certain device driver components of the NetWare Operating System and one embodimennt of a configuration supervisor which reside on the fault tolerant computer system, proven in FIG.
The NetWare Operating Systems call to retrieve configuration desk information is GetMLIDConfigurationTableEntry. Proceeding to state network cables , for a canister system, the consumer removes the canister containing the failed card and exchanges an old adapter with a model new adapter. The consumer then reinserts the canister. For a non-canister system, the person swaps the old adapter for the new adapter within the slot. The primary purpose of the Filter CDM 516 is to locate every HAM 512, register adapter occasions, and course of the I/O droop and I/O restart requests from the configuration manager 500. These commands shall be mentioned in greater detail below with reference to FIG.
With demand for 24-hour access to important, server-based information resources, planned system downtime for system service or enlargement has turn out to be unacceptable. However, numerous entities have tried to implement the hot plug of these adapters to a fault tolerant pc system. One significant difficulty in designing a sizzling plug system is protecting the circuitry contained on the adapter from being short-circuited when an adapter is added to a powered system. Typically, usb adapter incorporates edge connectors that are located on one facet of the printed circuit board. These edge connectors permit energy to switch from the system bus to the adapter, in addition to supplying information paths between the bus and the adapter. These edge connectors match into a slot on the bus on the pc system.
An instance of such an answer is described in U.S. No. 5,210,855 to Thomas M. Bartol. The technique as defined in declare 1, moreover comprising receiving a request for the new add of the programmable mass storage adapter from a consumer interface program. For canister techniques with a PCI bus, at state 810, the new plug hardware 318 reapplies power to the slot or the canister.
If a person requests to restart an adapter 310, the completion routine calls the adapter driver's reinitialize routine . Otherwise, if the user requests to droop an adapter 310, the completion routine calls the driving force's droop routine . After an adapter's re-initialization or suspension , the adapter driver 308 creates one other gadget state IRP .
The HSM 508 receives this call and resets the adapter 310. For both suspend and restart, the driver then proceeds to state 930 which returns successful message to the SNMP agent or NetWare user interface. Adapter Hot Plug with NetWare Operating System FIG. 5 is a block diagram illustrating the system parts of the NetWare Operating System and an embodiment of the software program parts of the invention. A configuration manager 500 is answerable for managing all or some of the adapters on the PC buses 234 and 236 (FIG. 2), or 250, 252, 254 and 256 (FIG. 3). The configuration manager 500 retains track of the configuration information for each managed adapter located on the fault tolerant laptop system one hundred.
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