Plug and Play adapters are capable of establish themselves to the computer system after the consumer installs the adapter on the bus. network cables and Play adapters are additionally able to determine the hardware assets that they want for operation. Once this information is equipped to the working system, the operating system can load the adapter drivers for the adapter that the user had added while the system was in a non-powered state. [newline]Plug and Play is used by both Windows ninety five and Windows NT to configure adapter playing cards at boot-time.
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For many companies, these adjustments lead to issues over server reliability and manageability, particularly in mild of the more and more critical position of server-based functions. Referring to the state 910, the configuration supervisor 500 assigns the variable “board_num” the worth of zero. The configuration supervisor 500 uses the variable “board_num” when requesting info from the NetWare Operating System driver configuration tables. A driver configuration table describes what NetWare is aware of a few particular driver and the motive force's adapter. At state 918, the configuration manager 500 calls the NetWare Operating System to request the configuration table of the “board_num” logical slot.
After the resumption of communication to the mass storage adapter 102, the Filter CDM 513 returns completion standing to the configuration supervisor 500 . [newline]The configuration manager 500 initiates the suspension of I/O to either the NWPA 510 for the mass storage adapters 102 or the LSL 502 and MSM 504 for the network adapter 104. 9 and 10, described beneath, illustrate intimately the process by which the configuration manager 500 suspends and resumes the I/O to a mass storage adapter and to a community adapter. Starting in state seven hundred, all units already working within the selected canister are situated, and activity involving those adapters is suspended. In one embodiment, the SNMP agent 520 or the NetWare User Interface 518 locates all devices, and initiates the request for the suspension for every adapter, such as the adapter 310, on the canister.
9A and 9B are flowcharts exhibiting one process by which the configuration supervisor might suspend and restart I/O for decent swapping network adapters beneath the NetWare Operating System, proven in FIG. 2 is a block diagram showing a primary embodiment of a multiple bus configuration connecting I/O adapters and a community of microcontrollers to the clustered CPUs of the fault tolerant laptop system, shown in FIG. The subject of the invention relates to I/O adapters in pc methods. More notably, the sphere of invention relates to the recent add and swap of adapters on a computer system. The configuration supervisor 1100 controls the communication between each adapter and adapter driver by calling the SCSI port 1104 and NDIS 1105.
eleven is a block diagram illustrating a portion of the Windows NT Operating System and a configuration supervisor which each reside on the fault tolerant computer system, shown in FIGS. However, the invention disclosed in the Jeffries patent also accommodates several limitations. It requires the bodily modification of the adapter to be hotly installed. Another limitation is that the Jeffries patent doesn't train the new addition of recent adapter controllers or bus methods. Moreover, the Jeffries patent requires that earlier than an I/O adapter is removed, one other I/O adapter should either be free and spare or free and redundant. Therefore, if there was no free adapter, hot removing of an adapter is inconceivable until the user added another adapter to the computer system.
6, 7 and 8 illustrate a generic course of by which various embodiments of the present invention may carry out the new add and swap of adapters. 6, 7 and eight describe not only the hot add and swap course of beneath the NetWare Operating System, but additionally they describe the new add and swap process under Windows NT Operating System . 12 through 17 give consideration to the process by which the recent add and swap course of shown in FIGS.
A fault tolerant server is useful for mission crucial applications such because the securities business where any pc down time can lead to catastrophic financial penalties. A fault tolerant computer will enable for a fault to be isolated and never propagate by way of the system thus providing full or minimal disruption to persevering with operation. Fault tolerant methods also present redundant elements, similar to adapters, so service can proceed even when one component fails. The technique as defined in claim 15, whereby the model new mass storage adapter is configured to speak with a Peripheral Component Interconnect bus.
If the variety of requests pending on an adapter isn't zero, the Filter CDM 513 checks to see if the counter is all the means down to zero . If the counter just isn't zero, the Filter CDM 513 decrements the counter . The Filter CDM 513 repeats the method of reading the outstanding I/O until there are zero I/Os pending on the mass storage adapter or the counter reaches zero . If the counter reaches zero, the Filter CDM 513 assumes that the mass storage adapter is malfunctioning . The Filter CDM 513 proceeds to shut down the mass storage adapter, losing the pending I/Os . After the Filter CDM 513 shuts down the adapter, the Filter CDM 513 relays the standing of the I/O suspension to the configuration manager 500 .
SNMP is one of a set of protocols known as TCP/IP, which is specifically designed to be used in managing computer techniques. In one embodiment of the invention, the computers would be much like the fault tolerant pc system of FIG. 1 and linked in a server community through connection a hundred thirty. hard drives for a hot plug operation.