JPS5834073B2 - Data change method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention stores exchange control data in a main storage device,
The present invention relates to a data change method that allows the data to be easily changed in a method for backing up the stored contents with an external storage device.

In electronic switching systems that have a central processing system, data for switching control is stored in the main memory, and switching control operations are performed using data read from the main memory. A method of backing up is adopted.

In that case, when it becomes safe to add or change exchange control data, it is necessary to change the storage contents of the main storage device and to change the storage contents of the external storage device accordingly.

Therefore, conventionally, for example, as shown in Fig. 1, the input/output device 1
When the update data is sent from 0 to the main memory device MM via the main memory controller MMC of the central controller CC to perform writing, and the updated data is used to control the communication path system device SP to perform exchange control. There is a method of writing to the external storage device EM via the external storage control device EMC by another command when the operation is normal, but this method requires at least two commands to change, and the central side (Foundation) Equipment C
The processing amount of C increases, and the maintenance procedures become complicated and troublesome.

As shown in FIG. 2, when the external storage device EM is configured to be replaceable, original data D is written to the main storage device MM via the input/output device 10 and the main storage control device MMC, and the information is There is also a method of writing to another external storage device EM' using the processing device IP and exchanging the medium with the existing external storage device EM.

This method requires a separate information processing system, requires acquisition and labor to exchange the medium of the external storage device EM, and furthermore, since the changes are made in another place, the contents of the changes between the main memory and the external memory are inconsistent. It has disadvantages such as easy occurrence of

Also, as shown in FIG. 3, the external storage device is EM1.

When installing multiple units such as 8M2, for example, to store the original data in EMI and the changed data in 8M2, first transfer the data up to the changed part from EM1 to 8M2, and then transfer the block containing the changed part. 8M2 after the change
There is a method of creating an external storage device EM2 containing the latest original data by writing data to 8M2 and then transferring subsequent data from EM1 to 8M2, but this method requires two or more external storage devices, so It has the disadvantage of being expensive.

Note that magnetic tape devices are generally used as external storage devices, and inter-block gaps are formed between data blocks. Therefore, partial rewriting has not been adopted.

An object of the present invention is to easily change the contents of an external storage device in conjunction with changes or additions to the contents of the main storage device, as well as to easily initialize the main storage device.

Examples will be described in detail below.

FIG. 4 is a block diagram of main parts of an embodiment of the present invention, and C
C is the central controller, ■0 is the input/output device, EMMC is the storage controller, WC is the write controller, IPL is the initial
Program loading device, MM is main memory, EM
is an external storage device such as a magnetic tape device.

For example, when change data is input manually from the input/output device IO, the storage control device EMMC performs write control to change the contents of the main memory device MM, and also sends address information of the main memory device MM to the external storage device EM. Write control is performed to add the data and changed data.

For example, as shown in FIG. 5, when changing the shaded data DT in the main memory device MM, the data in the main memory device MM is stored in the area next to the original data SD on the magnetic tape MT of the external storage device EM. DT address information AD and its data D
Write T as a changed data CD, or if it is further changed, write the changed data CD' as AD' and DT'.
is further written to the next area.

Therefore, since the exchange control data can be changed with a single command, data change processing becomes easy.

In such a state, when initializing the main memory device MM, the initial program loading device IPL operates, and the contents of the external memory device EM are transferred to the main memory device MM and writing is performed. It is done.

At that time, after the original data SD has been written, the modified data CD, CD' is written to the position of the main memory device MM designated by the address information AD, AD', for example, the diagonally shaded position in FIG. , DT' are written in an overpainted format, and the main memory device MM is initialized with the data changed.

Through such initial settings, data is set in the main memory device MM, and the exchange system (goods) is performed according to the data.

Then, at any time, a set of exchange system data in the main memory MM is written to the external memory EM by the write control device WC.
The original data S by writing to the position of the original data SD
The area D is updated with the latest contents of the main memory MM, and the changed data CD and CD' are no longer needed.

Such rewriting of the external storage device EM can be performed at any time, such as during a time when the amount of processing is low or when there is no additional area for the changed data CD.

As explained above, in the first invention, when changing or adding data for exchange control, the data to be changed or added is written in the main storage device MM to a specified address, and the data to be changed or added is written in the external storage device EM. When writing the data and address as changed data to an area different from the original data area and initializing the main memory MM using this external storage device EM, the original data in the external storage device EM is read out first. Therefore, the read original data is used to initialize the main memory device MM, and then the changed data is read out, so the initial settings are performed in the form of an overlay based on the address of the changed data. Since data can be changed or added to the main memory device MM and the external memory device EM simultaneously, the data change operation can be performed with a single command, which has the advantage of simplifying processing. be.

Furthermore, since the original data in the external storage device EM is not partially changed or added, there is an advantage that it is easy to control writing to a sequential file such as a magnetic tape.

Further, the second invention further updates the original data in the external storage device EM by writing the contents of the main storage device MM into the original data area of the external storage device EM, which is the same as the above-mentioned first invention. In addition to the effects of the invention, it is possible to transfer the contents of the main memory device MM to the external memory device EM and update the original data at any time, so the update process can be performed by selecting a time when the amount of processing is low. Can be done.

Further, until the original data is updated, it remains as is even if the data is changed or added, so it is possible to reproduce the state before the data was changed or added, if necessary.

The present invention can be applied not only to the case where the exchange system is under storage program control but also to the case where the exchange system is on the wiring logic side.

[Brief explanation of drawings]

1, 2, and 3 are explanatory block diagrams of the conventional example, FIG. 4 is a block diagram of main parts of the embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the operation. CC is the central controller, IO is the input/output device, EMMC is the storage controller, WC is the write controller, IPL is the initial program loading device, MM is the main memory,
EM is an external storage device such as a magnetic tape device.

Claims (1)

[Scope of Claims] 1. Electronic exchange power that stores exchange control data in a main memory, performs exchange control operations using the data stored in the main memory, and backs up the main memory with an external storage device. In the formula, the data changing means changes or adds the exchange control data, the data changing means changes or adds data at a commanded address of the main storage device, and the external storage device For the device,
Writing changed data including the data and an address in the main storage device to an area different from the original data, and initializing the main storage device using the external storage device,
A data modification method characterized in that the original data in the external storage device is transferred to the main storage device and then overpainted with the modification data. 2. The data changing means changes or adds data at a specified address in the main storage device in response to a single command, and writes the changed data in an area different from the original data in the external storage device. A data changing method according to claim 1 characterized in that. 3. Accumulate exchange control data in the main storage device, perform exchange system (goods) operations using the storage capacity of the main storage device,
Further, in an electronic exchange system in which the main storage device is backed up by an external storage device, there is provided a data changing means for changing or adding data for the exchange system (goods), and the data changing means is used to update the main storage device. The data at the commanded address is changed or added, and the data is written to the external storage device as changed data including the data and the address in the main storage device in an area different from the original data. The initial setting of the main storage device using an external storage device is performed by transferring the original data of the external storage device to the main storage device and then overpainting it with the changed data, and then overwriting the original data of the external storage device with the changed data. A data modification method characterized in that the update is performed by writing the contents of the main storage device to the original data area of the external storage device. 4. The data changing means changes or adds data at a specified address in the main storage device by a single instruction, and writes the changed data in an area different from the original data in the external storage device. A data changing method according to claim 3 characterized in that.