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As described above, under the protected memory model, a failing process cannot corrupt the memory datasheeg used by other processes. Service endpoint managers SEMs within the modular system services of the kernel software running on each line card use the service endpoint numbers assigned by the NMS to enable ports and to link instances of applications, for example, ATM, running on the line cards with the correct port.
Prior to shipping computer system 10 to customers, a software build process is initiated to establish the software architecture and processes. Service density refers to the proportionality between the net output of a particular device b56a its gross hardware capability. For other applications, a request for more memory indicates a memory leak error. Spec see Data Sheet at Junction dtaasheet Dalbani is a national and international distributor of high quality electronic components and parts.
If the status did change, then communications have been stalled for the length of time between polls. Instead, under the modular software architecture, the applications themselves gather necessary information i.
In one embodiment, configuration database 42 is a Polyhedra database from Polyhedra, Inc. There may be upgrades that require changes to multiple applications and to the APIs for those applications.
The type field more specifically defines the subclass failure or event. Records — indicate that ATM controller c is to start four primary instantiations of ATM —and records — indicate that ATM controller c is to start four backup instantiations of ATM — as backup for four primary instantiations on LID 31 line card 16 b.
If a primary fails over to the backup, the failed primary may datashret replaced with a new primary. 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.
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In addition, the NMS can use different class files for each computer system such that the data gathered on each system can be particularized to each system.
Instead of implementing a change to a distributed application across the entire computer system, an evaluation mode allows the SMS to implement the change in only a portion of the computer system.
In one embodiment, the kernel includes operating system software, standard system services software and modular system services software. If the upgrade goes smoothly and is committed described belowthen central processor 12 will begin operating in backup mode and replace old configuration database 42 with new configuration database Moreover, if multiple instantiations of ATM are running on line card 16 a e. Service is not disrupted on the other ports ports 44 a44 b44 d since vertical stacks, and are unaffected and the applications and drivers within those stacks continue to execute and transmit data.
A managed device represents the top level system connected to models representing both hardware and software applications Through software load records and the tables in configuration database 42applications are downloaded and executed without the need for the system services, including the SRM, or any other software in the kernel to have information as to how the applications should be configured.
The user informs the NMS of the device driver change and provides a copy of the new software e. In another aspect, the configuration database supports an active query feature and the NMS database is configured to establish an active query for all records within the configuration database to synchronize the NMS database with the embedded database. Typically, new and faster hardware is added to increase bandwidth or add computing power to an existing network.
This information may be provided as a text list, as a logical picture in a graphical user interface GUIor in a variety of other formats. Configuration database 42 may automatically copy the changes made to SET 76 and ATM instance table to persistent storage 21 such that if the computer system is shut down and rebooted, the changes to the configuration database will be maintained.
Similarly, vertical stacksand include one instance of ATM, and one device driver 43 b43 c43 drespectively and each vertical stack is associated with a separate port 44 b44 c44 drespectively. 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.
This is important because over-reacting to a failure, for example, re-booting an entire computer system or re-starting an entire dagasheet card, may severely and unnecessarily impact service to customers not affected by the failure, and under-reacting to failures, for example, restarting only one process, may not completely resolve the fault and lead to additional, larger failures.
Hence, the failed device driver must be brought back up i.
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Similarly, if device driver 43 b fails, then only vertical stack and its associated port 44 b are affected. This is also referred to as converting the UML logical model into a database schema and various views look at particular portions of that schema within the database.
The local slave SRM may take more severe action to recover from an excessive number of these non-fatal faults that result in memory datasheeet. Simultaneously, because central processor 13 is in backup mode, the application and DDL file are also copied to memory on central processor 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.
Unfortunately, the data and code within the image is static and cannot be changed without changing the entire image. Consequently, a failure is likely to only disrupt service on that one port, and again, the SMS can further minimize the disruption by automatically downgrading the configuration of that port oh the detection of an error. Often, the upgrade of one process results in the failure of another process.
The OSE operating system and system services provide datashee single inter-process communications mechanism that allows processes to communicate regardless of their location in the system.
The PMD file includes a table that corresponds card type and version number with name of the mission kernel image executable file MKI.