JPH0443422A - Electronic disk sub-system - Google Patents

Abstract

PURPOSE:To shorten the turn around time of a write instruction by eliminating registration from control when a subordinate control part normally terminates reading and preventing registration when a main control part normally terminates writing. CONSTITUTION:This system consists of the main control part (a) and a data storage part (b). The data storage part (b) is constituted of an adapter part A, the subordinate control part B, a memory control part C and an IC memory part D. The subordinate control part B in the data storage part (b) reads record fields corresponding to a cylinder number, a track number and a record number, which are registered in the control area of the data storage part (b) in a constant period. When reading normally is terminated, registration is eliminated from the control area. The main control part (a) receives the write instruction from a central processing unit. When writing normally is terminated, an operation on registration is not executed. Thus, the turn around time of the write instruction can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic disk subsystem, and particularly to an electronic disk subsystem that manages data fields destroyed due to a failure of a host device.

[Conventional technology]

Conventionally, this type of electronic disk subsystem received a command from the central processing unit and was writing data to the data storage unit when the central processing unit failed and data transfer was interrupted, causing data to be destroyed. The cylinder number, track number, and record number corresponding to the recorded record field are registered in the control area of the data storage section, and data is written to the data storage section in response to a subsequent command from the central processing unit.

Then, the cylinder number and number registered in the control area are
Checks whether the record field corresponding to the track number/record number has been rewritten normally. If there is a record field in the registration group that has been rewritten to normal data, the corresponding cylinder number/record field is checked. The function of deleting the track number/record number from the registration of the control area is always performed at the end of a write command from the central processing unit.

[Problem to be solved by the invention]

In the conventional electronic disk subsystem described above, each time a write command to a data storage unit received from a central processing unit is successfully completed, the cylinder number/number of the cylinder in the data destruction state registered in the control area of the data storage unit is checked. Checks whether the record field corresponding to the track number/record number has been rewritten to normal data, and if it has been rewritten normally, registers the corresponding cylinder number/track number/record number in the control area. Since the write command is erased from , there is a drawback that the turnaround time of the write command becomes longer due to the control time of the control area.

[Means to solve the problem]

The electronic disk subsystem of the present invention includes a data storage section comprising a plurality of IC memories that are volatile storage elements;
a main control section that reads and writes the memory contents of the data storage section in response to instructions from a central processing unit; and a slave control section that reads and writes the memory contents of the data storage section asynchronously with the main control section. In the electronic disk subsystem in the data storage unit, the main control unit receives a write command from the central processing unit and sets the cylinder number, track number, and record number corresponding to the memory address of the data storage unit as a write start address. While writing data to the data storage unit, the writing data is interrupted due to a failure in the central processing unit, and the cylinder number, track number, and record number of the record field in which the data is destroyed is stored in the data storage unit. The slave control unit reads the record field corresponding to the cylinder number, track number, and record number group registered in the control area from the memory at regular intervals, and the data is destroyed. The central It is configured by receiving instructions from the processing device and reporting the cylinder number, track number, and record number of the registered location.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, which is composed of a main control section a and a data storage section. Second
The figure is a block diagram showing the configuration of the data storage section, in which an adapter section A, a slave control section B that reads and writes memory contents, and B1 and B-2 are data buses used in the slave control section B. The control unit local memory is composed of an IC memory unit consisting of an IC memory and a memory control unit C that controls the IC memory unit, and the slave control unit B is connected to the data bus control unit B.
-1 and local memory B-2.

J, 10 is a bus commonly used between the adapter section A, slave control section B, and memory control section C, and 11 to 1
6 is an adapter part A, slave control part B, and a slave control part B connected to the bus 10.
This is an input/output signal line for the memory control unit C.

Here, the operation of this embodiment will be explained.

The main control unit a transfers data to be written from the central processing unit through the signal line 11 to the memory control unit C.
If data transfer is interrupted due to a failure in the central processing unit during writing to the C memory section, the cylinder number, track number, and record number corresponding to the record field at the time of interruption are registered in the control area of the IC memory section. put.

On the other hand, the slave control unit B, through the memory control unit C, inputs the record fields for the cylinder number, track number, and record number registered in the control area of the IC memory unit.
reading from the C memory section, and when the reading is completed normally, deleting the corresponding cylinder number, track number, and record number from the control area at a constant cycle asynchronously with the main control section a; In response to a command from the central processing unit, the main control unit a transfers the registered cylinder number, track number, and record number group from the control area of the IC memory unit to the central processing unit.

〔Effect of the invention〕

As explained above, in the present invention, the slave control section in the data storage section reads record fields corresponding to cylinder numbers, track numbers, and record numbers registered in the control area of the data storage section from the data storage section at regular intervals. , by deleting the registration from the control area when the reading is completed normally, and when the main control unit receives a write command from the central processing unit and the writing is completed normally, the operation related to the registration is not performed. This has the effect of shortening the write command turnaround time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a data storage section. 10/12/13/15/16...common bus, 11/
14...Signal line, a...Main control section, b...Data storage section, A...Adapter section, B...Slave control section, B-
1...Data bus control section, B-2...Local memory, C...Memory control section, D...IC memory section.

Claims (1)

[Scope of Claims] A data storage section consisting of a plurality of IC memories that are volatile storage elements; a main control section that reads and writes memory contents of the data storage section in response to instructions from a central processing unit; , an electronic disk subsystem having a slave control section in the data storage section that reads and writes memory contents of the data storage section asynchronously with the main control section, wherein the main control section receives a write command from a central processing unit; The cylinder number, track number, and record number corresponding to the memory address of the data storage unit are received as the write start address, and while the data is being written to the data storage unit, the write data is lost due to a failure in the central processing unit. The cylinder number, track number, and record number of the record field whose data was destroyed due to interruption are registered in the control area in the data storage unit, and the slave control unit registers the cylinder number and track number registered in the control area. The record field corresponding to the number/record number group is read from the memory at regular intervals, and it is determined whether the data is in a state of data destruction or if writing has already been completed normally. It has a function of deleting the corresponding cylinder number, track number, and record number from the registration of the control area, and reports the cylinder number, track number, and record number of the registered part in response to a command from the central processing unit. An electronic disk subsystem having the following characteristics.