JPH04207554A - Exchange - Google Patents

Abstract

PURPOSE:To make fault restart processing stable and to make data recovery after fault restart efficient by providing a revision history recording means and a revision data restoration means to the exchange. CONSTITUTION:A revision history recording means 5 records a data after revision as an exchange processing data on a recording medium 4 and records before revision as a history by revision of an exchange processing. Then a revision data restoration means 5 at fault restart processing reads an optional part among data to be revised from the recording medium 4 and restores the part in a work data area 2. Thus, the save of the revised data and the recovery from the fault caused by the revised data are made compatible. Thus, the fault restart processing is made stable and the data restoration after fault restart is made highly efficient.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention records at least data for exchange processing on a non-volatile recording medium, and stores the data in a working data area in the event of a failure. The present invention relates to an exchange that performs restart processing by returning the device to its original state.

(Prior Art) Conventionally, for example, in a storage program type exchanger, as shown in FIG. 5, an exchange processing program or data (hereinafter referred to as backup・When a failure occurs, the backup program/data recorded on the recording medium 1 is restored to the working data area (for example, RAM, etc.) 12. A failure restart processing method is adopted in which processing is restarted.

However, serious failures in switching equipment are relatively often the result of data construction (data modification) work on the switching equipment, so if backup programs/data are changed at the same time as data construction, bank up
Even if you restart the process after performing a recovery using Brograno/Data, there is a high possibility that the same failure will occur again.

In order to solve this problem, a method has recently been adopted in which the backup program/data is changed after a certain period of stability has elapsed after data modification.

However, with this method, the contents of the data file after the data has been changed are not saved in a non-volatile recording medium, so the data file is completely updated every time the failure restart process is performed. I was wondering if I needed to start over.

(Problem to be solved by the invention) As described above, with the conventional failure restart processing method in exchanges, there is a problem that it is difficult to simultaneously save changed data and recover from a failure caused by the changed data. Ta.

The present invention is intended to solve such problems, and aims to both save changed data and recover from failures caused by this changed data, stabilize failure restart processing, and restore data after failure restart. The aim is to provide a switching system that can improve the efficiency of restoration work.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the exchange of the present invention records at least exchange processing data on a non-volatile recording medium,
In an exchange that restores the data for exchange processing from the recording medium to the working data area and resumes processing in the event of a failure, it records the changed data as data for exchange processing on the recording medium, and also records the data after the change as data for exchange processing on the recording medium. a change history recording means for recording data before the change as a history of the changed part;
The apparatus is equipped with a changed data restoring means for reading out any changed data part from the recording medium and restoring it to the working data area at the time of failure restart processing.

(Function) In the exchange of the present invention, the change history recording means records the changed data on the recording medium as data for exchange processing, and records the data before change as the history of the changed part of the data for exchange processing. The modified data restoration means reads any part of the changed data from the recording medium and restores it to the working data area during failure restart processing. It is possible to achieve both the storage of changed data, which was difficult in the previous method, and the recovery from failures caused by this changed data. It is possible to improve efficiency.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the configuration of a storage program type switch according to an embodiment of the present invention.

During normal operation of the exchange shown in this figure, the CPU
The exchange process is performed using the exchange process program and exchange process data on the RA~12.

If a serious failure occurs in this exchange, ROLi B
By starting the above failure restart processing program,
The backup program/data for the exchange process previously stored in the fixed disk 4 is loaded onto the RAM 2, and the exchange process is thereby restarted.

FIGS. 2 and 3 are diagrams for explaining the method of loading this backup program/data onto the RAM 2. FIG.

As shown in FIG. 2, on the fixed disk 4 are files A and B, in which the latest backup program/data for exchange processing is always written, and
As a data change history, a file C is prepared in which the backup program/data before the change corresponding to the changed part is written as differential data.

In the switch of this embodiment having the above configuration, as shown in FIG. The data is loaded into the exchange processing program area 2A and exchange processing data area 2B (steps B and C). Next, RA only the differential data to be recovered from the differential data file C.
Load into exchange processing data area 2B on M2 (
Step D). As a result of the above, the exchange process is restarted (step E).

Next, the contents of the differential data file C will be explained using FIG.

As shown in the figure, the differential data file C is composed of a henody section H and a data record section F. Header part H
The start address A1 and end address A2 of the data record are recorded, as well as the update date and time T1 for restart processing in order to specify how much data is to be recovered when restarting from a failure.

The data record section F is composed of a plurality of data records and has the structure of a normal cyclic file. Furthermore, each data record L has a data update date and time T2 and a data address A3 on RAM2.
, data size S and actual data D are recorded.

Note that the update date and time Tl for restart processing in the header section H of the differential data file C can be changed freely by operation from the maintenance console 5.

Next, the main operations of this exchange will be explained.

First, when changed data is input from the maintenance console 5 during data construction, if the contents of the exchange processing data area 2B on the corresponding RAM 2 are updated with the changed data, the changed data will be updated quantitatively. As a result, the contents of file B of the hackup data are also updated. Then, data corresponding to the changed portion of the contents of the exchange processing data area 2B before update is registered in the difference data file C as difference data.

Also, when loading this differential data onto RAM2,
Search for the data record L by referring to the data record start address A1 and the data record end address A2 of the header part H of the differential data file C,
Address A3 on RAM on data record L and data
With reference to the size S, the target data D is loaded into the exchange processing data area 2B on the RAM 2.

Data records that are not loaded here can be loaded into the exchange processing data area 2B by instructions from the maintenance console 5. It is also possible to delete any part from the data record L by operating the maintenance console 5.

Furthermore, if there is no unused area in the data record section F of the differential data file C during data construction, the oldest data record L will be deleted starting from data D, and new data records will be created in the empty space. Register L. This process can also be performed manually by instructions from the maintenance console 5.

Thus, according to the exchange of this embodiment, during failure restart processing, it is possible to automatically restore any part of the exchange processing program/data that has been changed due to data construction and restart the exchange processing. It becomes possible to both save data and recover from failures caused by this changed data.

In this embodiment, the data structure of the differential data file C has been explained as an actual data image on the RAM 2, or as a logical image such as an image of a database call or an input command image from the storage console 5. It is also possible to record it as data.

In addition, as described above, the differential data to be restored can be specified automatically using the update date and time for restart processing, but this can be done manually by instructions from the storage console 5 after restarting the exchange processing. It is also possible to do so.

Furthermore, this method uses a switch that loads only the exchange processing data during failure restart processing (for example, the exchange processing program or the RO
Needless to say, it is also effective in the exchanges located on M.

Also, the medium for recording backup programs/data and differential data is not limited to the fixed disk 4 (for example, non-volatile recording media such as floppy disk 6, magnetic tape, bubble memory, etc.) Substitution is possible.

[Effects of the Invention] As explained above, according to the switching device of the present invention, it is possible to both save changed data and recover from a failure caused by this changed data, and it is possible to further stabilize failure restart processing. , data recovery work after failure restart becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a storage program switch according to an embodiment of the present invention, Fig. 2 is a diagram for explaining a failure restart processing method in the embodiment, and Fig. 3 is a flowchart of the processing operation. FIG. 4 is a diagram showing the contents of a differential data file, and FIG. 5 is a diagram for explaining a failure restart processing method in a conventional storage program type switch. 1...CPU, 2...RAM, 3...ROM, 4...
-Fixed disk, 5.Maintenance console, A..Exchange processing program file, B..Exchange processing data file.C.Difference data file. Figure 3 Figure 5

Claims (1)

[Scope of Claims] In an exchange that records at least data for exchange processing in a non-volatile recording medium, and in the event of a failure, restores the data for exchange processing from the recording medium to a working data area to perform restart processing, the recording medium comprising: a change history recording means for recording the data after the change as the data for the exchange process and the data before the change as the history of the changed part of the data for the exchange process; and at the time of the failure restart process, the recording medium 1. A switching system characterized by comprising changed data restoration means for reading out any changed data portion from above and restoring it to the working data area.