JP2588629B2 - Data transfer method - Google Patents

Description

The present invention relates to a system in which data is input to and output from a storage unit having a data area including a plurality of blocks each having a predetermined number of bytes as one block. Of a system that performs input / output to / from a storage means having a data area consisting of a plurality of blocks each having a predetermined number of bytes as one block, with the aim of providing a method that enables inheritance of data. A data transfer method for changing the number of bytes of one block of the data area, wherein the data area before the change is defined as a first data area, and the first data area corresponds to each block; A second data area having the number of bytes of 1 as a block is secured in the storage means, and data exists in each block of the first data area. Data presence / absence detection means for detecting whether or not to perform data, data clear means for clearing data set in each block of the first data area in block units, and data to be written by a write request in the second data area And a means for reading data from the corresponding block in the first or second data area.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for performing input / output with respect to a storage unit having a data area including a plurality of blocks each having a predetermined number of bytes as one block.

For example, in an exchange system having a service function such as an abbreviated dial service, data used for providing this service (for example, a full dial number corresponding to an abbreviated dial number) is secured in an office data area in a storage device of the exchange. It is stored in this data area.
In the data area, a predetermined number of bytes (for example, 2 bytes) is assigned to each data area (the area is referred to as a block in this specification). In this data area, data such as a dial number is appropriately set according to a request of a subscriber or the like, but the maximum of one data is 2 bytes, and no more data can be set. However, at the beginning of the switch design, we thought that 2 bytes for one data was enough.
Also, the actual situation was in line with this, but with the recent expansion of service functions, etc., there have been cases where a 2-byte capacity cannot satisfy all requests, and this capacity is reduced to, for example, 4 bytes. You may want to extend it. It is also conceivable that further expansion will be required in the future.

In performing such an extension, in a telephone exchange system and the like, it is important to match data before and after the extension, and it is necessary to carry out this online (system operating state). Requested.

2. Description of the Related Art Conventionally, when data is taken over by extending the number of bytes in one block of a data area, the system is stopped or a function having the same function is temporarily substituted for the old data area. Is deleted, and a new data area in which newly created new data (old data or data obtained by changing a part of the old data) is set is secured in the storage means.

Problems to be solved by the invention However, in a system such as a telephone exchange, which has a large social impact when the system is stopped, such a system stop must be avoided, and a method of substituting for another system is also required. There is a problem in terms of cost or man-hours. In addition, when the data volume is enormous, there is a problem that creating new data is troublesome, causes a setting error, and lacks reliability.

The present invention has been made in view of such a point,
The purpose is to provide a method that allows data to be taken over while the system is operating.

Means for Solving the Problems FIG. 1 is a block diagram showing the principle configuration of the present invention.
Reference numeral 1 denotes a data area (hereinafter referred to as a first data area) in which the area is secured in the storage means. The first data area 1 is composed of a plurality of blocks each including m bytes (for example, 2 bytes). Before data transfer, the first data area 1 is accessed.

Reference numeral 2 denotes a data area in which the number of bytes of one block to be changed is n bytes (for example, 4 bytes) and corresponds to each block of the first data area 1 on a one-to-one basis, and n bytes constitute one block (hereinafter referred to as a first area). This is referred to as a second data area to distinguish it from one data area), and is set on the storage means when it is time to take over the data.

Reference numeral 3 denotes data presence / absence detecting means for detecting whether or not data exists in each block of the first data area 1. Reference numeral 4 denotes data clear means for clearing data set in the first data area 1 in block units. Is writing means for writing data to be written in response to a write request to the second data area 2, and 6 is reading means for reading data from the first data area 1 or the second data area 2.

When there is an access request (write request and read request), the data presence / absence detecting means 3 detects whether data is set in a block of the first data area 1 corresponding to the access request, and a data clear means. 4. Notify the writing means 5 or the reading means 6.

When data is set in a corresponding block of the first data area 1 and the access request is a write request, the writing means 5 responds to the block of the second data area 2 corresponding to the write request. The data clearing means 4 clears a block of the first data area 1 corresponding to the write request.

When data is set in a corresponding block of the first data area 1 and the access request is a read request, the reading means 6 reads data from the block of the first data area 1 corresponding to the read request. Then, the data is written into the corresponding block of the second data area 2 by the writing means 5, and the data clearing means 4 clears the block of the first data area 1 corresponding to the read request.

When the corresponding block of the first data area 1 has been cleared, the access by the writing means 5 or the reading means 6 is performed to the corresponding block of the second data area 2 and all of the first data area 1 are accessed. Is cleared, the second data area 2 is accessed thereafter, and the first data area 1 is released.

As described above, according to the present method, when an access request occurs, the block to be accessed in the first data area is cleared (if the access request is a read request, the data is deleted from the corresponding block in the second data area). The first data area is cleared when all blocks in the first data area are cleared, and thereafter, only the second data area is accessed.

Thus, when the number of bytes of one block in the data area is changed, it is possible to take over the data without stopping the system (online), and to transfer the data read from the first data area to the second data area. Since it is set in the data area, there is no error and the data inheritance by data transfer is good.

Embodiment Hereinafter, a case where the present invention is applied to a telephone exchange system will be described as an example. FIG. 2 is a diagram showing a schematic configuration of an exchange system to which the present invention is applied.
A network (NW) unit, 12 is a subscriber terminal connected to the network unit 11 via a trunk, 13 is a control device (CC) for performing various controls, and 14 is a storage device (MM). In the storage device 14, in addition to programs and data used for replacement and maintenance, etc., a data area as shown on the left side of FIG. 3 (shown as an old data area) is set. Stores station data used to provide various services such as speed dial service. This data area includes a plurality of blocks (A, A) in which one lock consists of m bytes (for example, 2 bytes).
B, C, D, ...).

Further, a console 15 for maintenance is connected to the control device 13, and the maintenance person can input various commands or input data from the console 15, and Editing of data (addition of data, setting, etc.) can be performed.

In the data takeover processing according to the method of the present invention, the program stored in the storage device
13 is executed, and when it becomes necessary to extend an area for one data of the data area of the storage device 14 in which the station data is stored, the maintenance person takes over the data from the console 15. The execution is started by inputting a command or the like serving as a trigger for executing the process and information such as the number of bytes for one data.

During the operation of the system, before giving the above trigger, for example, when a speed dial number is sent from the subscriber terminal 12, the control device 13 sends the speed dial number of the old data area in the storage device 14. The full dial number is taken out from the position corresponding to, and a predetermined exchange process is performed. After the trigger is input, the following process is executed and the data is taken over. In the following description, an access request to the data area is made to the block A as appropriate.

First, the data area of the storage device 14 in which the station data is stored is set as an old data area, and each area (block) of the old data area in which one data is stored has a one-to-one correspondence. After a data area (shown as a new data area on the right side of FIG. 3) having the changed number of bytes (n bytes) input by the user as one block is set in the storage device 14, a fourth data area is set. The processing is performed according to the flowchart shown in FIG. 5 or FIG. 4 and 5, the numbers in parentheses added to the respective steps correspond to the processes by the respective units in FIG.

FIG. 4 shows processing when the access request is a write request. That is, the process is performed when a maintenance person inputs a command and data for editing station data from the console 15.

The control device 13 accesses the block A of the old data area of the storage device 14 (step 401), and then determines whether or not data is set in the block A of the old data area (step 402). When data is set, the process proceeds to step 403. When block A is empty (when data is not set), the process proceeds to step 406.

In step 403, it is determined whether the input by the maintenance person is to add data or to newly set. If the input is to newly set, the process proceeds to step 406. If the data is to be added in step 403, in step 404, the data input by the maintenance person is added to the data in block A in the old data area, and the data is set in block A in the new data area. The block A in the data area is cleared (step 405), and this processing ends.

If no data is set in step 402 or if new data is set in step 403, the data input by the maintenance person is set in block A of the new data area in step 406. The block A in the old data area is cleared, and this processing ends. If the block A in the old data area is empty after the end of step 406, this processing may be ended without executing step 405.

FIG. 5 shows processing when the access request is a read request. That is, the process is performed when the subscriber terminal 12 refers to the office data when a speed dial number is dialed or the like.

The control device 13 accesses the block A of the old data area of the storage device 14 (step 501), and then determines whether or not data is set in the block A of the old data area (step 502). When data is set, the process proceeds to step 503. When block A is empty (when data is not set), the process proceeds to step 506.

If the data is set in the block A of the old data area in step 502, the data of the block A in the old data area is set in the corresponding block A of the new data area in step 503, and then the block of the old data area is set. A is cleared (step 504), and processing is performed using the read data of the block A in the old data area (step 505).

In step 502, block A of the old data area
Is empty, in step 506, access is made to block A of the new data area, and it is determined whether data is set in block A (step 50).
7) If data is set, in step 508,
Processing is performed using the data of block A in the new data area. If block A is empty in step 507, processing in step 509 when there is no data is performed.

According to the present embodiment, when an access request occurs,
The processing shown in FIG. 4 or FIG. 5 is performed, and by executing these processings a plurality of times, the data is finally cleared for all the blocks in the old data area and the new data area is cleared. Data will be set. When all data in the old data area is cleared, access (write / read) is performed only to the new data area thereafter.
As a result, the old data area can be released.

Effect of the Invention As described in detail above, the present invention enables data transfer while the system to which the present invention is to be applied is operating when changing the capacity of one block in the data area. The workability can be greatly improved, for example, there is no need to stop the system at the time, and there is an effect that the inheritance of the data before and after the handover is not impaired since no mistakes in data setting can occur.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle configuration of the present invention, FIG. 2 is an explanatory view of an embodiment in which the present invention is applied to an exchange system, FIG. 3 is an explanatory view of a data area in the embodiment of the present invention, FIG. FIG. 5 is a flowchart showing a process at the time of data writing in the embodiment of the present invention, and FIG. 5 is a flowchart showing a process at the time of data reading in the embodiment of the present invention. 1 ... first data area, 2 ... second data area, 3 ... data presence / absence detecting means, 4 ... data clearing means, 5 ... writing means, 6 ... reading means.

Claims (1)

(57) [Claims] 1. A system according to claim 1, wherein a data area consisting of a plurality of blocks having a predetermined number of bytes as one block is input / output to / from a storage means. A data transfer method for changing the number of bytes, wherein the data area before the change is defined as a first data area (1), the first data area (1) corresponds to each block, and the number of bytes after the change is changed. A data presence / absence detection means (3) for securing a second data area (2) in the storage means, wherein the data is present in each block of the first data area (1); Data clearing means (4) for clearing data set in each block of the first data area (1) in block units; and data to be written in response to a write request in the second data area. Means (5) for writing to the corresponding block of the data area (2)
And means (6) for reading data from a corresponding block in the first or second data area (1, 2). When an access request occurs, if the access request is a write request, the second data The data to be written in response to the write request is written to the corresponding block in area (2), and the block in first data area (1) corresponding to the corresponding block in second data area (2) is cleared. If the request is a read request, the data read from the corresponding block of the first data area (1) is written to a corresponding block of the second data area (2), and the corresponding block of the first data area (1) is written. Clearing, and after all blocks in the first data area (1) are cleared, accessing the second data area (2). Splicing method.