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For example, SEMs 96 a — 96 d are spawned to independently control ports 44 a — 44 d. Again, because the configuration changes were not saved in persistent storage, when the computer system powers back up, the old configuration will be the one implemented. In general, the upper level application e. At times, the software may be equipped with the appropriate instrumentation to detect these problems before they become hard failures, but even then, network operators are responsible for manually detecting and repairing the conditions.
An Audit process resynchronizes the restarted device driver with associated applications and other device drivers such that the data plane can again transfer network data. It is also coupled to ATM interface model If the operating system assigns a new process for each configurable object, the operating system’s capabilities may be quickly exceeded.
For other applications, a request for more memory indicates a memory leak error. Similarly, if the master SRM receives failure reports from multiple boards indicating Ethernet failures, the master SRM may determine that the Ethernet hardware is the problem and initiate a fail-over to backup Ethernet hardware.
The slave SRM then goes through the process described above to determine whether to take corrective action or escalate the fault to the datashset SRM. The modular software architecture takes advantage of the isolation provided to each process e. Each line card includes a control processor subsystem 18 a — 18 nwhich runs an instance of the kernel 22 a — 22 n including slave and client programs as well as line card specific software applications. The higher the scope of the recovery action, the larger the temporary loss of services.
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The slave logging entity sends a notice to master logging entitywhich may log the event in master log event file Whatever b564x reason is, you won’t be stuck with an item you cannot use or you do not want.
Use of the JDBC protocol allows the NMS to communicate with the configuration database in the same manner that it communicates with its own datashert storage mechanisms, including the NMS database.
The NMS process can communicate, for example, with the configuration database through a standard database protocol. MCD 38 uses the information it retrieves to update card table 47 and port table In a computer system that includes a spare or backup line card described belowthe backup state is best saved on another line card such that in the event of a hardware fault, the backup state is not lost and can be copied from the other line card.
Backward compatibility has been provided in the past through revision numbers, however, initial communication between processes involved polling to determine version numbers and where multiple applications need to communicate, each would need to poll the other.
Similar to the ECG This information is in the application group table in the configuration database. Perhaps a zero indicates v564a value field of 32 bits and a one indicates a value filed of 64 bits.
Configuration changes may be automatically copied to persistent storage as they are made so that if the computer system is shut down and rebooted, the memory and configuration database will reflect the last known state of the hardware. Current methods provide only sporadic coverage for a narrow datasheer of hard faults.
The embodiment described below includes a network computer system with a xatasheet coupled distributed processing system. In addition, recovery time is reduced to only the time required to re-start g564a particular application or driver instead of the time required to re-start all the processes associated with a line card or the entire system. In the embodiment where changes are made directly to configuration database 42 on central processor 12they are made only in non-persistent memory until committed described below.
Importantly, the old configuration database records and the original application files are not deleted or altered.
The configuration database detects LID 30 in SLR a and sends slave SRMs 37 b line card 16 a and 37 o line card 16 n a change notification including the name of the executable file e. Application program interface API dependencies between datwsheet loaded software applications and kernel resident software further complicate upgrade operations.
Consequently, a PID could be permanently assigned to the chassis, shelves and slots and stored in a file. Monitoring and proactively responding to events may also allow the computer system and network operators to address issues before they become failures.
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All three slave SRMs 37 b37 c and 37 o then set up active queries with configuration database 42 to insure that they are notified of any software load records SLRs created for their LIDs. Service providers not only incur downtime due to failures, but also incur downtime for upgrades to deploy new or improved software, hardware, software or hardware fixes or patches that are needed to deal with current network problems.
Typically, the number of line cards and ports on each line card in a computer system is variable but the number of chasses, shelves and slots is fixed. Under the software class, subclass indications may include whether the fault or event is a system fault, an exception or related to a specific application, for example, ATM.
In some instances, the change to an application may require changes to configuration database To address this concern, in one embodiment, the NMS and the master SMS periodically send messages to each other indicating they are executing appropriately.
In some cases, only a single release per year is feasible.
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In addition, supporting a large number of independent processes may reduce the operating system’s datasbeet and slow the operation of the entire computer system.
Views also allow the logical model and physical system to be changed, evolved and grown to support new applications and hardware without having to change existing applications. The user informs the NMS of the device driver change and provides a copy of the new software e. Unfortunately, much of the data and code required to support basic system services, for example, event logging and configuration remain static in the kernel.