JP2931665B2 - switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention records at least exchange processing data on a non-volatile recording medium, and stores the data in a work data area when a failure occurs. The present invention relates to an exchange that performs a restart process by returning.

(Prior Art) Conventionally, for example, in an exchange of a storage program type, as shown in FIG. 5, an exchange processing program or data (hereinafter referred to as backup data) Program / data), and when a failure occurs, the backup program / data recorded on the recording medium 11 is returned to the work data area (for example, RAM or the like) 12 for processing. A failure restart processing method of restarting is adopted.

However, since a serious failure in an exchange occurs relatively frequently as a result of data construction (data change) work of the exchange, if the backup program / data is changed simultaneously with the data construction, the backup program must be replaced when the failure occurs. / Even if the process is resumed after performing recovery by data, there is a high possibility that the same fault will occur again.

In order to solve this problem, a method has recently been adopted in which a backup program / data is changed after a certain stable period after data construction.

However, in this method, since the contents of the data construction once the backup program / data is changed are not stored in the non-volatile recording medium, it is necessary to completely perform the data construction every time the failure restart processing is performed. Had occurred.

(Problems to be Solved by the Invention) As described above, in the failure restart processing method in the conventional exchange, the backup data of the changed exchange processing data is stored, and the failure caused by the changed exchange processing data is changed. There is a problem that it is difficult to balance with recovery from a disaster.

The present invention has been made in order to solve such a problem, and aims to achieve compatibility between storage of backup data of changed exchange processing data and recovery from a failure caused by the changed exchange processing data. It is an object of the present invention to provide an exchange which can stabilize a failure restart process and improve the efficiency of data recovery work after a failure restart.

[Means for Solving the Problems] To achieve the above object, an exchange according to the present invention is an exchange which performs exchange processing using exchange processing data in a work data area. Means for recording backup data of exchange processing data on the non-volatile backup data area in the non-volatile backup data area, and partially replacing the exchange processing data on the work data area and the backup data on the backup data area. Means for changing, and of the exchange processing data before the change,
Means for recording the data corresponding to the changed portion as differential data in a nonvolatile differential data area, and using the changed backup data on the backup data area and the differential data on the differential data area, Means for returning the exchange processing data before the change to the work data area.

(Operation) With the exchange of the present invention, it is possible to achieve compatibility between storing backup data of the changed conversion processing data and recovering from a failure caused by the changed exchange processing data. It is possible to stabilize the failure restart processing and to improve the efficiency of data recovery work after the failure restart.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

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

During normal operation of the exchange shown in this figure, CPU 1
The exchange processing is performed using the exchange processing program and the exchange processing data on the RAM 2.

When a serious fault occurs in this exchange, the fault resumption processing program on the ROM 3 is started, so that the backup program / data for the replacement process stored in the fixed disk 4 in advance is loaded on the RAM 2. , The exchange process is restarted.

2 and 3 show this backup program /
FIG. 3 is a diagram for explaining a method of loading data onto a RAM2.

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

In the exchange of the present embodiment having the above configuration, as shown in FIG. 3, when a serious failure occurs due to the exchange processing data after the change (step A), first, the backup program, the backup data file The contents of A and B are exchanged program area 2A on RAM2.
Then, the data is loaded into the exchange processing data area 2B (steps B and C). Subsequently, only the differential data to be recovered from the differential data file C is loaded into the exchange processing data area 2B on the RAM 2 (step D). Thus, the exchange process is restarted (step E).

Next, the contents of the difference data file C will be described with reference to FIG.

As shown in the figure, the difference data file C is composed of a header part H and a data record part F. The header portion H records a start address A1 and an end address A2 of the data record, and a renewal date and time T1 for resumption processing for designating how much data is to be restored when the failure is resumed.

The data record section F is composed of a plurality of data records L and has a normal cyclic file structure. Further, each data record L records an update date and time T2 of the data, an address A3 of the data on the RAM 2, a data size S, and actual data D.

The renewal date and time T1 for resuming the header portion H of the difference data file C can be freely changed by an operation from the maintenance console 5.

Next, main operations in the exchange will be described. First, when change data is input from the maintenance console 5 at the time of data construction, the contents of the exchange processing data area 2B on the corresponding RAM 2 are updated with the change data, and at the same time, the backup data is changed by the change data. The contents of file B are also updated. In the difference data file C, data corresponding to the changed portion in the contents of the exchange processing data area 2B before the update is registered as difference data.

When the difference data is loaded onto the RAM 2, first, the data record start address A1 and the data record end address A2 of the header H of the difference data file C are read.
The data record L is searched with reference to the above, and only the update date T2 of the data record L that is newer than the update date T1 for restart processing of the header portion H is targeted for the address on the RAM in the data record L. The target data D is loaded into the exchange processing data area 2B on the RAM 2 with reference to A3 and the data size S.

The data records L not loaded here can be loaded into the exchange processing data area 2B according to an instruction from the maintenance console 5. Further, an arbitrary part can be deleted from the data record L by an operation from the maintenance console 5.

In addition, the file C
When there is no more unused area in the data record portion F, the data D of the oldest data record L is deleted in order, and a new data record L is registered in the empty portion. This processing can also be manually performed according to an instruction from the maintenance console 5.

Thus, according to the exchange of this embodiment, it is possible to automatically recover any part of the exchange processing program / data changed by the data construction and restart the exchange processing during the failure restart processing. It becomes possible to store backup data of the changed exchange processing data and to recover from a failure caused by the changed exchange processing data.

In this embodiment, the data structure of the file C of the difference data is described as an actual data image on the RAM 2. However, for example, a theoretical image such as an image of a data base call or an input command image from the storage console 5 is used. It is also possible to record it as data.

As described above, the designation of the difference data to be restored can be automatically performed using the update date and time for the resumption processing.
It can also be performed manually according to instructions from.

Furthermore, this method uses an exchange that loads only the exchange processing data at the time of failure restart processing (for example, if the exchange processing program is RO
Needless to say, it is also effective for the exchanges on M).

The medium for recording the backup program / data and the difference data is not limited to a fixed disk, but may be replaced with a non-volatile recording medium such as a floppy disk 6, a magnetic tape bubble memory, or the like. It is.

[Effect of the Invention] As described above, according to the exchange of the present invention, storage of backup data of changed exchange processing data,
Recovery from a failure caused by the changed exchange processing data can be compatible, and the failure restart processing can be further stabilized, and data recovery work after the failure restart can be facilitated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a storage program type exchange 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 flow 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 exchange. 1 ... CPU, 2 ... RAM, 3 ... ROM, 4 ... fixed disk, 5 ... maintenance console, A ... replacement processing program file, B ... replacement processing data file,
C: Difference data file.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-73847 (JP, A) JP-A-2-213260 (JP, A) JP-A-64-25644 (JP, A) JP-A-4- 32343 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H04M 3/22

Claims (1)

(57) [Claims] 1. An exchange for performing exchange processing using exchange processing data on a work data area, means for recording backup data of the exchange processing data on the work data area on a non-volatile recording medium. Means for partially changing the exchange processing data on the working data area and the backup data on the recording medium, respectively, and the data corresponding to the changed part of the exchange processing data before the change. Means for recording the difference data on a non-volatile recording medium; and using the changed backup data and the difference data on the recording medium, restoring the exchange processing data before the change on the work data area. An exchange comprising: