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Master SRM 36 reads a master default fault policy file e. If a primary fails over to the backup, the failed primary may be replaced with a new primary. Instead of failures, however, the sub-processes may notify the LRM of events that may require action.
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Транзисторы TO-92 / КТ-26 (иностр.)
DD publishes this name to NS b along with the process identification assigned by the operating system and the name of its service endpoints. 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 datasueet.
ATM will then re-subscribe with NS b. The majority of Internet outages are directly attributable to software upgrade issues and software quality in general.
As a result, if a darasheet fails, only the memory block assigned to that process is assumed corrupted while the remaining memory space is considered uncorrupted.
The NMS is updated, assigns an LID and updates the logical to physical table and notifies the user of the new hardware. In addition, if the slave SRM has detected and logged the same failure multiple times and in excess of a predetermined threshold, then the slave SRM may escalate the failure to the next hierarchical scope by notifying master SRM 36 of the failure.
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.
Other applications and associated ports—as well as the customers serviced by those ports—will not experience service outages. 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 The present invention provides a network device having an internal configuration database process for managing configuration of internal resources within the network device in response to configuration input provided by an external Network Management System NMS process.
Since these changes are typically made in non-persistent memory, they will be lost if the system is rebooted prior to upgrade commitment. The fault handler then notifies the local slave SRM of the hardware exception and the process that caused it.
The SMS implements the upgrade in a lock step fashion. In these systems, NMS polling is unnecessary and wasteful if the configuration has not been changed.
To minimize synchronization time, many 1: A managed device represents the top level system connected to models representing both hardware and software applications The application may also need time to access a management information base MIB interface.
Using the data in the local backup allows the device driver to quickly recover. Often, the upgrade of one process results in the failure of another process. In addition, if a new device driver is added e.
KSB564A Datasheet PDF
External network control data is passed from the line cards to the central processor over Ethernet In this example, Ethernet 32 provides an out-of-band control path, meaning that control information passes over Ethernet 32 but the network data being switched by computer system 10 passes to and from external network connections 31 a — 31 xx over a separate data path Processes that use this API must use the predefined message format.
Alternatively, the user may choose to manually commit the upgrade at his or her leisure. A fault policy based on hierarchical scopes ensures that for each particular type of failure the most appropriate action is taken. Changes made to the configuration database are passed to the NMS database to insure that both databases store the same data.
Card table 47 includes records corresponding module type datashete version number with the physical identification PID and slot number of that board. All Auction Buy It Now. One alternative is to assign a unique process identification number to only certain high level processes. As a result, updates are provided only when necessary i. Speed of recovery is one of the primary considerations when establishing a fault policy. 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 dafasheet below.
Software modularity involves functionally dividing a software system into individual modules or processes, which are then designed and implemented independently. 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.
BA Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
The data instructs the control shim to start in upgrade mode and passes required configuration information. The device driver may be running on one or more boards in computer system Like certain existing architectures, the modular software architecture dynamically loads applications as needed.
The name server notifies individual processes of the existence of the processes and objects with which they need to communicate and the process identification numbers needed for that communication. In addition, the computer system described below is a network dtaasheet for use in, for example, the Internet, wide area networks WAN or local area networks LAN.
DD will then re-publish with NS b and include the newly assigned process identification number. Device driver software may also be upgraded and the implementation of device driver upgrades is similar to the implementation of application upgrades.
S Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
The local logging entity may also log the failure in local event log a. In the embodiment described below, NMS 60 runs on a personal computer or workstation 62 and communicates with central processor 12 over Ethernet network 41 out-of-band.
A long synchronization time can significantly disrupt system service, and in the case of a computer network device, if synchronization is not done quickly enough, then hundreds or thousands of network connections may be lost which directly impacts the service provider’s availability statistics and angers network customers.
This is important because over-reacting to a failure, for example, re-booting an entire computer system or re-starting an entire line 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.
Instead, central processor 12 with its older copy of configuration database 42 stays dormant in case an automatic downgrade is necessary described below.
The NMS process can communicate, for example, with the configuration database through a standard database protocol.
The PMD file includes a table that corresponds card type and version number with name of the mission kernel image executable file MKI.