JPH0243617A - Doubling file control device - Google Patents

Abstract

PURPOSE:To shorten the time of a data compare operation by executing the compare operation of an original or copy data storage part after the data restoring is completed for the block unit of the data storage part when the power source of a doubling file control device is turned on and when the data are restored from a magnetic disk device for saving the data to an original and copy data storage part. CONSTITUTION:When the power source of a doubling file control device is turned on and the data from a magnetic disk device to original and copy data storage parts 2 and 3 are restored, interruption is applied to the comparing part when the data restoration of the block unit is completed by a magnetic disk control part, and the interruption is applied to the comparing part when the data restoration of the same block unit as the magnetic disk control part is completed by other magnetic disk control part. Thus, the comparing part executes the compare operation of the original and copy data storage parts 2 and 3 of the block unit and this is continued until the data restoration is completed. Thus, the completion of the data compare operation can be completed simultaneously when the data restoration operation is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a duplex file control device, and particularly to the performance of data restoration of file data.

[Conventional technology]

Conventionally, this type of duplex file control device restores data from the data backup magnetic disk device to the primary and secondary data storage sections when the power is turned on, and after all data restoration is completed, the primary and secondary data are I was comparing the memory section.

[Problem to be solved by the invention]

Considering the conventional duplex file control device described above, the primary and secondary data storage units are compared after data restoration from the data backup magnetic disk unit to the primary and secondary data storage units is completed. This method has the disadvantage that a lot of time is wasted until it is determined whether the comparison is successful or not, and the data storage section must be read out again during the comparison.

[Means to solve the problem]

The configuration of the duplexed file control device of the present invention includes primary and secondary data storage sections that are constituted by a plurality of IC memories that are volatile storage elements and have the same data content, and a control that controls the primary and secondary data storage sections. a magnetic disk device for saving data that saves data contents of the data storage section and the primary and secondary data storage sections; a magnetic disk control section that controls the magnetic disk device; and a comparer that performs a data comparison of the primary and secondary data storage sections. In a duplex file control device consisting of a block unit, when the duplex file control unit is powered on, the magnetic disk control unit restores data from the magnetic disk device to the primary and secondary data storage units in units of blocks. By interrupting the compare unit when the data restoration of the magnetic disk control unit is completed, and by causing the other magnetic disk control unit to interrupt the compare unit when the data restoration in the same block unit as the magnetic disk control unit is completed, The compare unit is characterized in that it performs a compare operation of the primary and secondary data storage units in units of blocks, and continues this operation until data restoration is completed.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a file control device showing one embodiment of the present invention, and FIG. 2 is a block diagram of the inside of a data storage section.

1 is a data control unit, 2 and 3 are primary and secondary data storage units, respectively, 4 is a data comparison unit for the data storage unit, 7 is a control unit for the compare unit, and 5.6 is the primary and secondary data storage unit, respectively. A magnetic disk device for saving data, 8 is a magnetic disk device, a is a command issued by the data control unit, b is an interrupt signal indicating that one block of data restoration is completed, C is a control signal for data saving and data restoration It is.

Next, the operation will be described.

When the file control device is powered on, the magnetic disk control unit 8 controls the operation of restoring data from the magnetic disk units 5 and 6 to the data storage units 2 and 3, respectively. 8 issues an interrupt in response to an interrupt signal, and on the other hand, when the data compare control unit 7 receives an interrupt from another data storage unit 2 or 3, it performs a data compare operation.

An interrupt is generated by b, while the data compare control unit 7
When it receives an interrupt from another data storage unit, it compares one block that is to be stored in the primary and secondary data storage units at that time. Continue this for each block,
Continue until data restoration is completed.

〔Effect of the invention〕

As explained above, the present invention enables data to be restored in block units of the data storage section when the duplex file control device restores data from the data backup magnetic disk device to the primary and secondary data storage sections when the power is turned on. By performing a compare operation on the primary or secondary data storage unit after the data storage unit is completed, the data compare operation can be completed at the same time as the data restore operation, thus completing the data restore operation of conventional duplex file control devices. This has the effect of shortening the time required for the data compare operation compared to the later data compare.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a duplex file control device showing one embodiment of the present invention, and FIG. 2 is a block diagram of a data storage unit. a...Data control unit-data storage unit operation instruction signal;
b...1 block restore end interrupt signal line, C...
・Magnetic disk control unit-magnetic disk device operation instruction signal, 1... data control unit, 2... primary data storage unit,
3... Sub data storage section, 4... Data compare section,
5...Magnetic disk device for primary data storage section, 6...
Magnetic disk device for secondary data storage section, 7... Data compare control section, 8... Magnetic disk control device.

Claims (1)

[Claims] A primary and secondary data storage section that is constituted by a plurality of IC memories that are volatile storage elements and have the same data content, a control section that controls the primary and secondary data storage section, and data in the primary and secondary data storage section. A duplex file control device comprising: a magnetic disk device for data backup for saving the contents of the data; a magnetic disk control section for controlling the magnetic disk device; and a compare section for comparing data of the primary and secondary data storage sections. When the duplex file control device is powered on, when data is restored from the magnetic disk device to the primary and secondary data storage units, the magnetic disk control unit performs the comparator operation when the data restoration in units of blocks is completed. When the other magnetic disk control unit finishes restoring data in the same block unit as the magnetic disk control unit, the compare unit interrupts the primary and secondary data in the block unit. Performs a compare operation on the data storage section,
A duplex file control device characterized by continuing this process until data restoration is completed.