JPS62154365A - Data memory reproducing device - Google Patents

Abstract

PURPOSE:To evade a deficiency in capacity while maintaining reliability by instructing two driving parts to write the same data in respective storage parts when the data is written and also instructing the two driving parts to write different data in the respective storage parts according to an external instruc tion. CONSTITUTION:A control part 1 connected to an arithmetic processor 6 and a main memory device 7 is provided with the driving parts 2 and 3 which control the magnetic heads of magnetic disks 4 and 5 and detect the rotational positions of the disks. Modes are switched to select a normal mode or duplex mode. In the duplex mode, the same data is written in the two magnetic disks 4 and 5 and when the data is read out, the data is read out of one predetermined magnetic disk while the other magnetic disk is used as a backup disk. In this case, if trouble occurs to the magnetic disk being read, the data is read out of the backup magnetic disk. Further, different data can be written in the respective storage parts by the two driving parts 2 and 3 according to an external indication.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a data storage/reproduction device.

[Technical Background of the Invention and Problems thereof] Conventionally, there has been a data storage/reproduction device that includes two sets of storage units, writes the same data in each storage unit, and uses one storage unit as a backup for the other. It has been known.

Such a device is highly reliable because even if one storage section is unable to write or read data normally for some reason, it can be covered by the other storage section.

However, in such devices, as a result of duplicating the storage sections, even if two sets of storage sections are provided, only the capacity for one set can actually be used, so there is no risk of running out of capacity. There was a problem.

[Object of the invention] The present invention was made under the circumstances as described above, and
The purpose of the present invention is to provide a data storage/reproduction device that avoids the situation of insufficient capacity as much as possible while maintaining reliability.

[Summary of the Invention] That is, in the data storage/reproduction device of the present invention, when writing data, the control section instructs two sets of drive sections to write the same data in each storage section, and writes the data. When reading, only one predetermined drive unit is instructed to read from the storage unit, and when a failure in one of the drive units is detected, that drive unit is excluded from the control target and the other drive unit is changed. It has a function of instructing the writing and outputting of data only to the drive unit, and a function of instructing the two sets of drive units to write separate data into and out of each storage unit based on an external instruction. This ensures that reliability is maintained and that capacity shortages do not occur.

[Embodiment 1 of the Invention Hereinafter, details of an embodiment of the present invention will be described based on the drawings.

The drawing is a block diagram showing the configuration of an apparatus according to an embodiment of the present invention.

The apparatus of this embodiment includes a control section 1 having a processing section 11 and a data storage section 12, a drive section 2 that controls the head of the magnetic disk 4 and detects the rotational position of the disk, and a drive section 2 that controls the head of the magnetic disk 4 and detects the rotational position of the disk. It is composed of a drive unit 3 that controls the magnetic head fII and detects the rotational position of the disk, and is connected to an arithmetic processing unit 6 and a main storage unit 7.

The processing section 11 has a function of storing information sent from the KFFI embedding device 6 in the data storage section 12 and starting up the driving section 2 and the driving section 3 based on the stored data.

The data storage unit 12 also includes a mode storage unit 121 that stores the usage mode of this device, and information about which magnetic disk to read data from when the two sets of magnetic disks 4 and 5 are used in duplication. A disk number storage section 122 for storing, a disk address storage section 123 for storing a write address or a continuation address of a magnetic disk, a transfer byte number storage section 124 for the drive section 2 for storing the number of bytes of data to be transferred, and a drive section. 3 transfer byte number storage unit 125 and a main memory address storage unit 126 for the drive unit 2 that stores write and read addresses in the main memory device 7.
and a memory address storage section 127 for the drive section 3.

The device of this embodiment operates in either the normal mode or the duplex mode by switching the mode.

Here, the duplex mode refers to a mode in which the same data is written to two sets of magnetic disks at the same time, and when reading, data is read only from one predetermined magnetic disk, and the other magnetic disk is used for backup. means.

In this case, when a failure occurs in the successive magnetic disk, data is read from the backup magnetic disk.

The operation of the apparatus of this embodiment will be explained below.

In the following, description will be given separately for writing and reading in the duplex mode, and writing and reading in the normal mode.

8. In the case of duplex mode When the device of this embodiment is used in duplex mode, the operator instructs the setting of duplex mode by operating a switch in advance or by outputting a command from the computer.

Then, the processing unit 11 sets the contents of the mode storage unit 121 to a value indicating duplication.

Further, when a magnetic disk to be used for reading is specified by a switch operation or a command from a calculator, the processing section 11 stores information indicating the magnetic disk number at the time of reading in the disk number storage section 122. Hereinafter, the magnetic disk 4 will be referred to as a magnetic disk for continuous printing.

(In the case of a>Writing, first, the arithmetic processing unit 6 sends the disk start address, main memory start address, transfer byte?!1, etc. to the processing unit 11 in the control unit 1 as information for writing to the magnetic disk. It will be done.

Then, the processing unit 11 stores the sent information in the disk address storage unit 123 and the main memory address storage unit 12 for the drive unit 2.
6 and the memory address storage section 127 for the drive section 3, the transfer byte number storage section 124 for the drive section 2, and the transfer byte number storage section 125 for the drive section 3.

Furthermore, the processing section 11 controls and activates the drive sections 2 and 3 based on the information in the disk address storage section 123. The drive units 2 and 3 each control the movement of the magnetic head and detect the rotational position of the disk, and when the corresponding magnetic head reaches the address position indicated by the disk address storage unit 123, they issue an interrupt to the processing unit 11. Signal S1, S
Send 2.

For example, if the interrupt signal is from the drive section 2, the processing section 11
reads data from the main memory address indicated by the drive unit 2 main memory address storage unit 126 and sends it to the drive unit 2, and sets the value of the drive unit 2 transfer byte number storage unit 124 to “1”.
”, and the main memory address storage product 12 for the drive unit 2 is subtracted.
Add "1" to the value of 6.

Further, when the interrupt signal is from the drive section 3, the processing section 11 reads data from the main memory address indicated by the main memory address storage section 127 for the drive section 3 and sends it to the drive section 3.
The value in the transfer byte number storage section 125 for the drive section 3 is decreased by "1", and the value in the main memory address storage section 127 for the drive section 3 is incremented by "1".

Drive units 2 and 3 sequentially write write data from processing unit 11 onto magnetic disks 4 and 5.

Thereafter, the above operation is repeated until the value of the drive unit 2 transfer byte number storage unit 124 or the drive unit 3 transfer byte vl storage unit 125 becomes rOJ.

The processing unit 11 instructs the drive unit 2 or 3 whose transfer byte number storage unit has the value rOJ to complete the operation.

And when both drives 2 and 3 have completed their operation,
The processing unit 11 notifies the arithmetic processing device 1 of the completion of the operation.

(b) In the case of reading, the disk start address, main memory start address, and number of transferred bytes are sent from the arithmetic processing unit 6 to the processing unit 11 in the control unit 1 as information for successive reading of the magnetic disk.

The processing unit 11 sets the sent information in the disk address storage unit 123, the drive unit 2 transfer byte number storage unit 124, and the drive unit 2 main memory address storage unit 126.

Furthermore, the processing section 11 activates the drive sections 2 and 3 based on the information in the disk address storage section 123.

The driving units 2 and 3 each control the movement of the magnetic head and detect the rotational position, and when the corresponding head reaches the position of the address indicated by the disk address storage unit 123,
Interrupt signals S1 and S2 are sent to the processing unit 11.

The drive section 2 reads data from the address in the disk indicated by the disk address storage section 123 in response to the interrupt signal S1, and sends it to the processing section 11.

The processing unit 11 sequentially writes the sent data to the main memory address indicated by the drive unit 2 main memory address storage unit 126, and also writes the sent data to the main memory address indicated by the drive unit 2 transfer byte number storage unit 124.
The value of is subtracted by "1", and the value of the main memory address storage item 126 for the drive unit 2 is added by "11".

After that, the value of the transfer byte number storage section 24 for the drive section 2 becomes rO.
Repeat the above operation until J is reached.

The processing unit 11 instructs the drive unit 2 to complete the operation,
When the drive unit 2 completes its operation, it notifies the arithmetic processing unit 6 of the completion of the operation.

B. Normal Mode When the device of this embodiment is used in the normal mode, the operator instructs the setting of the normal mode by operating a switch in advance or by outputting a command from the calculator.

Then, the processing unit 11 sets the contents of the mode storage unit 121 to a value indicating the normal mode.

(a) At the time of writing, as information for writing to the magnetic disk, the disk start address, main memory start address, number of transferred bytes, and number of the magnetic disk occupying the data are sent from the arithmetic processing unit 6 to the control unit 1. The data is sent to the processing unit 11 of.

For example, when writing to the magnetic disk 4, the processing section 11 transfers the sent information to the disk address storage section 123 and the drive section 2.
The data is set in the transfer byte number storage unit 124 and the main memory address storage unit 126 for the drive unit 2.

The processing section 11 activates the drive section 2 based on the information in the disk address storage section 123.

The drive section 2 controls the movement of the magnetic head and detects the rotational position, and sends an interrupt signal S1 to the processing section 11 when the corresponding magnetic head reaches the position indicated by the disk address.

In response to this interrupt signal @S+, the processing unit 11 reads data from the main memory address indicated by the drive unit 2 main memory address storage unit 126 and sends it to the drive unit 2, and also reads the data from the drive unit 2 transfer byte number storage unit 124. is subtracted by "1", and the value of the main memory address storage section 126 for the drive unit 2 is added by "1".

Further, the drive section 2 sequentially writes the write data from the processing section 11 onto the magnetic disk 4.

After that, the value of the transfer byte number storage unit 124 for the drive unit 2 becomes “O”.
”Repeat the above operation until ” is reached.

Then, the processing unit 11 instructs the drive unit 2 to complete its operation, and when the drive unit 2 completes its operation, the processing unit 6
Notify the completion of the operation.

(b) In the case of reading, the arithmetic processing unit 6 sends the information for reading from the magnetic disk, including the disk start address, main memory start address, number of bytes to be transferred, and the number of the magnetic disk from which data is to be read, in the control unit 1. It is sent to the processing section 11.

For example, when reading from the magnetic disk 4, the processing section 11 transfers the sent information to the disk address storage section 123.
, the drive section 2 transfer byte number storage section 124, and the drive section 2 main memory address storage section 126.

Then, the processing section 11 activates the drive section 2 based on the information in the disk address storage section 123.

The drive unit 2 controls the movement of the magnetic head and detects the rotational position, and sends an interrupt signal S1 to the processing unit 11 when the corresponding head reaches the position indicated by the disk address.

In response to this interrupt signal S1, the drive section 2 reads data from the address in the disk indicated by the disk address storage section 123 and sends it to the processing section 11.

Further, the processing unit 11 sequentially drives the sent data 8[12
Write to the main memory address indicated in the main memory address storage section 126, and subtract "1" from the value of the transfer byte number storage section 124 for the drive section 2, and write the value of the main memory address storage section 126 for the drive section 2. Add "1" to .

Thereafter, the values of the transfer pi 1 to the data storage section 124 for the drive section 2 or r
Repeat the above operation until OJ is reached.

Then, the processing unit 11 instructs the drive unit 2 to complete its operation, and when the drive unit 2 completes its operation, the processing unit 6
Notify the completion of the operation.

Thus, according to the device of this embodiment, the function of the control unit 1 allows the two sets of storage units to be used in duplex mode according to the operator's designation, and when duplication is not necessary, the two sets of memory units can be used in the normal mode. It can be used with twice the capacity M.

[Effects of the Invention] As explained above, in the data storage/reproduction device of the present invention, when writing data, the control unit instructs two sets of drive units to write the same data in each storage unit. When reading data, only one predetermined drive unit is instructed to read from the storage unit, and when a failure in one drive unit is detected, that drive unit is excluded from the control target and the other drive unit is instructed to read data from the storage unit. It has the function of instructing data writing and reading only to the drive unit of
Since it has a function of instructing a set of drive units to write separate data into their respective storage units, it is possible to avoid a situation where each unit runs out while maintaining reliability.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a block diagram showing the overall configuration of an apparatus according to an embodiment of the present invention. 1...Control unit 2, Drive unit 4.5...Magnetic disk 6...Arithmetic processing unit 7... Main storage device 11... Processing section

Claims (1)

[Claims] (1) a storage unit that stores data; a drive unit that drives the storage unit to write and read data;
A data storage and reproducing device comprising: a control section that controls the drive section based on information sent from the outside;
Two sets of the storage unit and the drive unit are provided, and the control unit instructs the two sets of drive units to write the same data in each storage unit when writing data, and reads the data. When a predetermined drive unit is instructed to read data from the storage unit, when a failure in one of the drive units is detected, that drive unit is excluded from the control target and the other drive unit is instructed to read data from the storage unit. The controller has a function of instructing the writing and reading of data only on the drive unit, and a function of instructing the two sets of drive units to write separate data into each storage unit based on an instruction from the outside. A data storage/reproduction device characterized by: