JPS62250573A - Magnetic disk controller with automatic journal function - Google Patents

Abstract

PURPOSE:To reduce remarkably the load of software and to improve reliability with improved data maintenability by controlling a magnetic tape device, reading a data from a storage means at the detection of full-bit of the storage means and writing the data in the magnetic tape device. CONSTITUTION:A tape control section 14 supervises the full bits 15a and 15b in the storage sections 13a and 13b and when the section 14 detects the set state of the full bit 15a in the section 13a, the data are read from the storage section 13a and written in a magnetic tape device 3 via a data line 103. When all data read from the storage section 13a is finished, the storage section 13a resets the internal full bit 15b by the command of the tape control section 14. The section 14 applies the same processing also to the storage section 13b and then to the storage section 13a, the processings are repeated alternately. The storage capacity of the storage section 13a and the storage section 13b is decided based on one maximum write data quantity, data transfer performance and write performance to the magnetic tape device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk control device with an automatic journal function, and more particularly to a magnetic disk control device that automatically journals data written to a magnetic disk device to a magnetic tape device. .

[Conventional technology]

Conventionally, update data for a magnetic disk device has been maintained by saving the contents of the magnetic disk device to a magnetic tape device periodically, for example, after processing every day.

Further, the journal function of update data for a magnetic disk device has been realized by software writing data to a magnetic disk device and then writing the same data to a magnetic tape device.

[Problem that the invention seeks to solve]

The above-described conventional update data maintenance method for a magnetic disk device has the disadvantage that data integrity is poor and reliability is insufficient.

Furthermore, in the conventional journal function for update data for a magnetic disk device, software writes data to the magnetic tape device, so there is a drawback that the load on the software is extremely heavy.

In view of the above points, an object of the present invention is to provide a magnetic disk control device with an automatic journal function that greatly improves reliability by significantly reducing the software load and increasing data integrity. It is in.

[Means for solving problems]

A magnetic disk control device with an automatic journal function of the present invention controls data transfer between a plurality of storage means having a full bit indicating completion of writing in a designated area, a disk control n means for controlling a magnetic disk device, and a channel. channel control means that selects one of the storage means and writes data at the same time as data is transferred to the disk control means; and channel control means that controls a magnetic tape device and writes data from the storage means when a full bit of the storage means is detected. and an internal bus to which each of the means is connected.

〔Example〕

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

FIG. 1 is a block diagram showing one embodiment of the present invention.
is connected to a channel (not shown) via a data line 111101 and to an internal bus 104, and to a magnetic disk drive N2 via a data line 102, which is connected to an internal bus 104. A connected disk control unit 12, two storage units 13a and 13b each connected to an internal bus 104, and a tape control unit connected to the internal bus 104 and to the magnetic tape device 3 via a data line 103. 14.

Note that the symbols 15a and 15b represent the storage units 13a and '
13b, which indicates the completion of writing to the designated area.

Next, the operation of the magnetic disk control device with automatic journal function of this embodiment configured as described above will be explained.

The channel control unit 1 sends write data to the magnetic disk device 2 sent from the channel via the data line 101 to the disk control unit 12 via the internal bus 104, and the disk control unit 12 receives the data sent from the channel via the data line 101. The channel control unit 11 writes the write data to the magnetic disk device 2 via the data line 102, and at the same time, the channel control unit 11 writes the write data to the magnetic disk device 2 via the data line 102.
Check the reset state of full bits 15a and 15b in 3a and 13b, and check the reset state of full bits 15a and 15b in storage unit 13a,
-15a has been reset, this storage unit 1
3a is selected and the write data to the magnetic disk device 2 is also written to the storage unit 13a.In the case of one time, when the writing to the storage unit 13a is completely completed during multiple write processing,
The full bit 15a in the storage section 13a is sent, and the Chinese JLt control section 11 selects the storage section 13b to continue writing by checking the set state of the full bit 15a.

On the other hand, the tape control section 14 has storage sections 13a and 13b.
For example, when the set state of the full bit H5a of the storage section 13a is detected, data is read from the storage section 13a and written to the magnetic tape device 3 via the data line 103.

After reading all the data from the storage section 13a, the storage section 13a resets the internal full pick 15a according to instructions from the tape control section 14. The tape control unit 14
Similar processing is performed for the storage section 13b, and then repeated for the storage section 13a, and so on.

Note that the storage capacity of the storage unit 13a and the storage unit 13b is 1
It is determined based on the maximum write data amount, data transfer performance, write performance to the magnetic tape device 3, etc.

FIG. 2 is a block diagram showing another embodiment of the present invention. A magnetic disk controller with an automatic journal function IA of this embodiment is a magnetic disk controller with an automatic journal function of the embodiment shown in FIG. While the device 1 used a magnetic tape device 3 as a data save device, a cartridge tape device 3A is used instead.

Also in the magnetic disk control device IA with an automatic journal function of this embodiment, the magnetic disk control device with an automatic journal function of the embodiment shown in FIG. It goes without saying that the operation is exactly the same as that of device 1.

FIG. 3 is a block diagram showing still another embodiment of the present invention. A magnetic disk control device 1B with an automatic journal function of this embodiment is a magnetic disk with an automatic journal function of the embodiment shown in FIG. Whereas the control device 1 used the magnetic tape device 3 as a data save device, it uses a cassette tape device 3B.

Also in the magnetic disk control device IB with an automatic journal function of this embodiment, the magnetic disk control device with an automatic journal function of the embodiment shown in FIG. Equipment l and all (
Needless to say, similar operations are performed.

〔Effect of the invention〕

As explained above, the present invention has the effect of significantly reducing the software load, increasing data integrity, and significantly improving reliability by providing an automatic journal function inside the magnetic disk control device. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the invention, FIG. 2 is a block diagram showing another embodiment of the invention, and FIG. 3 is a block diagram showing still another embodiment of the invention. In the figure, 1, IA, IB...magnetic disk control device with automatic journal function, 2...magnetic disk device, 3...magnetic tape device, 3A...cartridge tape device, 3B ...Cassette tape device, 11... Channel control unit, 12... Disk control unit, 13a, 13b - Storage unit, 14... Tape control unit, 15a, 15b - Full Bit, 101, 102.103 ・Data line, 104...
...This is an internal bus.

Claims (1)

[Scope of Claims] A plurality of storage means having a full bit indicating completion of writing in a specified area; a disk control means for controlling a magnetic disk device; and a disk control means for controlling data transfer with a channel and transmitting data to the disk control means. channel control means for simultaneously selecting one of the storage means and writing data; 1. A magnetic disk control device with an automatic journal function, comprising: a writing tape control means; and an internal bus to which each of the means is connected.