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US7051097B1 – Embedded database for computer system management – Google Patents
One alternative is to assign a unique process identification number to fatasheet certain high level processes. A disadvantage to this approach is that objects within one high level process will likely need to communicate with objects within other high level processes.
If ATM fails, then only vertical stack and its associated port 44 c are affected. Forcing more releases each year may negatively affect software quality as all bugs may not be detected. The application controllers on each board now need to know how many instances of the corresponding application they need to spawn. It is also coupled to ATM interface model This is often referred to as regression. Transistor Type see all.
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The user chooses the desired redundancy structure and instructs the NMS as to which boards are primary boards and which boards are backup boards. Additionally, a dagasheet induced by an upgrade may cause the dataheet to hang, that is, the computer system will not shut down but will also become inaccessible by the NMS and inoperable. All of these problems impede the advancement of networks—a situation that is completely incongruous with the accelerated need and growth of networks today.
Although ATM applications were used in the examples datashfet, this is by way of example only. As described above, the name server notifies subscriber applications each time a subscribed for process is terminated. In one aspect, the invention provides a communications system having a network device that includes an internal configuration database process for managing configuration of internal resources within the network device. As one example, ATM model is shown.
Where applications and device drivers for a fatasheet line card are not already loaded and where changes or upgrades to already loaded applications and device drivers are needed, logical model FIGS.
Over time the user will likely make hardware changes to the computer system that require configuration changes. LRM also determines, based on the type of failure, whether it can fully resolve the error and do so without affecting other processes outside its scope, for example, ATM —device drivers 43 a — 43 d and their sub-processes and processes running on other boards.
A configurable fault policy allows the default fault policy 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.
Allowing failures to be handled at appropriate b564q levels avoids unnecessary recovery actions while ensuring that sufficient recovery datwsheet are taken, both of which minimize darasheet disruption to customers.
We will do our best to get back to you as soon as possible. The level of hot state backup is inversely proportional to the resynchronization time, that is, as the level of hot state backup increases, resynchronization time decreases. Consequently, it is nearly impossible to determine all the ways in which a computer system might fail, and in the face of an unexpected error, the default fault policy that was shipped with the computer system may cause the hierarchical scope master SRM, slave SRM or LRM to under-react or over-react.
For instance, connections included in the driver’s connection table and not in the ATM connection table were likely torn down by ATM prior to the device driver crash and are, therefore, deleted datasheer the device driver connection table.
The different message formats for each version may be hard coded into ATM or ATM may access system memory or the configuration database for the message formats corresponding to service endpoint version one and version two. This also allows an application, for example, ATM, to be upgraded to support new configurable objects, for example, new ATM interfaces, while still being backward compatible by supporting older configurable objects, for example, old ATM interfaces.
A distributed redundancy architecture spreads software backup hot state across multiple elements. Typically, work station 62 is coupled to many network computer systems, and NMS 60 is used to configure and manage each of these systems.
B564A View Datasheet(PDF) – Usha Ltd
N redundant system, then one line card, for example, line card 16 nserves as the hardware backup card for at least two other line cards, for example, line cards 16 a and 16 b. The code generator also creates a data definition language DDL file including structured query language SQL commands used to construct various tables and views within a configuration database described below and a DDL file including SQL commands used to construct various tables and views within a network management Eatasheet database described below.
If a b564aa driver, for example, device driverfails instead of an application, for example, ATMthen data cannot be passed. Each element may provide software backup for one or more other elements. The flexible naming process allows applications to use data in the configuration database to determine the names of other applications and configurable objects, thus, alleviating the datahseet for hard coded process names.
An example of a common error is a memory access error. Since the descriptors are hierarchical from left to right, wildcards in descriptor fields only make sense from right to dataheet.
Hence, the failed device driver must datasueet brought back up i. The type field more specifically defines the subclass failure or event. Since these changes are typically made in non-persistent memory, they will be lost if the system is rebooted prior to upgrade commitment. During this time, configuration changes may be made to the system.
BA Search electronic components documentation in datasheet archive
In addition, computer system 10 includes multiple line cards 16 a — 16 n. Going forward, the default fault datasjeet modified by the configuration fault policy—are used to detect, track and respond to events or failures. The NMS database establishes an active query for all configuration database records to insure it is updated with all changes.
The user then tells the NMS how they want the system configured. The logical name is location-independent; it can live on any card in the system. The computer system of the communications system can further include an internal NMS database process for tracking configuration information stored by the configuration database within the network device.
Alternatively, the master SRM may use its fault history for a particular line card to determine when a threshold is exceeded and automatically execute its fault policy. This is referred to as vertical fault isolation. For example, if computer system 10 is a 1: The protected memory model prevents the first process with the corrupted memory pointer from corrupting the memory space or block assigned to the second process.
In addition, each program is addressed with an abstract communication handle, or logical name. The master MCD may read a register for each slot that allows it to get the bit pattern produced by these resistors. The diagnostic program reads a line card type and version number out of persistent storage, for example, EPROM 42 a — 42 nand passes this information to the MCD.