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Memory and storage space within network devices is typically very limited. In addition, software applications may be upgraded and downgraded independent of each other and without having to re-boot computer system Similarly, the NMS assigns three service endpoint numbers e.
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The user then tells the NMS how they want the system configured. In addition, a configurable fault policy allows users to perform manual overrides to suit their specific requirements and to tailor their policies based on the datasheeg failure scenarios that they are experiencing.
Even for expected errors, dataxheet a computer system ships, certain recovery actions in the default fault policy may be determined to be over aggressive or too lenient. Perhaps a zero indicates a value field of 32 ddatasheet and a one indicates a value filed of 64 bits. The descriptor may also be sent to the local slave SRM, which tracks fault history based on the descriptor contents per application instance. Each sub-process may also include sub-processes, for example, ILMI sub-processes a — n.
Although ATM applications were used in the examples above, this is by way of example only. In addition, the failing device driver may have corrupted the hardware it controls, datasheeet, that hardware must be reset and reinitialized. Although the above described power-up and configuration of computer system 10 is complex, it provides massive flexibility as described in more detail below.
If the device driver is for a particular port, then the SMS must also search the port table to learn the PID for that port. Since, the upgrade changes to the configuration database are not copied to persistent storage 21 until datashet upgrade is committed, if the computer system is shut down, when it is powered back up, it will use the original version of the configuration database and the original executable files, that is, the computer system will experience an automatic downgrade.
B564A View Datasheet(PDF) – Usha Ltd
As one example, one port device datsaheet 43 a — 43 d may be started dagasheet each port 44 a — 44 d on line card 16 a. A configurable fault policy allows the default fault datasgeet to be modified to address behavior specific to a particular upgrade or release or to address behavior that was learned after the implementation was released.
For example, additional hardware costs may include duplicate memory components and printed circuit boards including all the components on those boards. Although each line card in the example above is instructed by the group table to start four instantiations of ATM, this is by way of example only. Resetting the hardware stops data flow. Board is also a parent class having multiple board models, including various functional boards without ports a — n e.
Each of these and other examples are described below. Each control processor subsystem includes a processor integrated circuit chip 2426 a — 26 nfor example, a Motorola or an 5b64a Pentium processor.
When the primary processes are restarted, backup state information is retrieved from datashert processes executing on line card 16 b as explained above. Hence, while the ATM application is terminated and restarted, the device drivers continue to function.
A temporary patch may also be needed while a hardware upgrade or fix is developed for a particular hardware fault.
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Redundancy adds to gross hardware capability but not datashwet the net output and, thus, decreases service density. Service providers not only incur downtime due to failures, but also incur downtime for upgrades to deploy n564a or improved software, hardware, software or hardware fixes or patches that are needed to deal with current network problems.
Corrective action may require failing-over one or more line cards 16 a — 16 n or other boards, including central processor 12to redundant backup boards or, where backup boards are not available, simply shutting particular boards down. Since the descriptors are hierarchical from left to right, wildcards in descriptor fields only make sense from right to left. The user could instruct the NMS to set up the group table to have each line card start one or more instantiations and to have each line card start a different number of instantiations.
The control shims e. All Specs available at datasheet archive: The SMS may cause the system to revert to the old configuration and application i. The local slave SRM will catalog the event and log it with the local logging entity, which may also log it with the master logging entity. As one example, ATM model is shown.
In addition, the descriptors can be matched with descriptors in the fault policy to determine the recovery action to be taken. Certain board changes to computer system 10 are also configuration changes. To load instances of software applications on the correct boards, the NMS creates software load records SLR a — n in configuration database Even where the backup element provides some datashert of hot state backup it generally lacks the processing power and memory to provide a datashest hot state backup i.
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The computer system of the communications system can be, for example, a workstation or a personal computer. In the embodiment described below, NMS 60 runs datxsheet a personal computer or workstation 62 and communicates with central processor 12 over Ethernet network 41 out-of-band.
Instead, NMS 60 could run datasheeet on computer system 10 provided computer system 10 has an input mechanism for the user. It is virtually impossible to ensure that a failed process is synchronized with other processes when it restarts, even when backup data is available. Through the active query feature, other software applications can be notified of changes to configuration database records in which they are interested.
Service is not disrupted on the other ports ports 44 b56444 b44 d since vertical stacks, and are unaffected and the applications and drivers within those stacks continue to execute and transmit data.
In addition to the above needs, a configurable fault policy also allows purchasers of computer system 10 e. To decouple software processes from the logical model—as well as the physical system—another layer of abstraction is added in the form of views. Also within the modular system services is a configuration service program 35 that downloads a configuration database program 42 and its corresponding DDL file from persistent storage into non-persistent memory 40 on central processor Alternatively, active queries may be established with the configuration database for configuration fault policies specific to each board type such that datashheet slave SRMs are notified directly of changes to their default fault policies.
Computer system datashdet also includes an internal communication bus 32 connected to each processor 2426 a — 26 dataseet. Until the ATM application is restarted and re-synchronized e.