JPS62250574A - Magnetic disk controller with automatic journal function - Google Patents

Abstract

PURPOSE:To improve reliability by reading data at the detection of the full bit of a storage means, rearranging the data in the order of track numbers of a magnetic disk device and writing the data in the magnetic tape device so as to relieve remarkably the load of the software and to improve the maintenability of the data. CONSTITUTION:A tape control section 14 supervises full bits 15a, 15b in storage sections 13a, 13b and detects the set state of the full bit 15a of, e.g. the storage section 13a, then the data are read from the storage section 13a, a data arrangement conversion circuit 16 arranges the data in the order of tracks of the magnetic disk device 2 and writes the data in the magnetic tape device 3 via a data line 103. When all the data read from the storage section 13a is finished, the storage section 13a resets the internal full bit 15a based on the command of the tape control section 14. The tape control section 14 repeats the same processing alternately such as the storage section 13b and then the storage section 13a again.

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 particularly to a magnetic disk control device that automatically journals data written to a magnetic disk device to a magnetic tape device. Regarding.

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

Means for Solving Problem c] A magnetic disk control device with an automatic journal function of the present invention comprises: a plurality of storage means each having a full bit indicating completion of writing in a designated area; a disk control means for controlling a magnetic disk device; , controls data transfer with the channel, and simultaneously transfers data to the disk control means, one of the storage means.
channel control means for selecting one and writing data;
Each of the means is connected to a tape control means that controls a magnetic tape device and reads data from the storage means when full bits of the storage means are detected, rearranges the data in the order of track numbers of the magnetic disk device, and writes the data to the magnetic tape device. It has an internal bus.

〔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.
The channel controller 11 is connected to a channel (not shown) via the data wA 101 and is connected to the internal bus 104, and the channel control unit 11 is connected to the internal bus 104 and connected to the magnetic disk device 2 via the data &11102. two storage units 13a and 13b connected to the 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 reference numerals 15a and 15b indicate storage units 13a and 1
A full bit provided in 3b indicates completion of writing in the designated area, and 16 indicates a data array conversion circuit provided in the tape control section 14, respectively.

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 11 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 storage section 3a and 13b, and if, for example, full bit tSa of storage section 13a is reset, this storage section 13
a is selected and the data written to the magnetic disk device 2 is also written to the storage section 13a. When writing to the storage unit 13a is completely completed during one or more write processes, the full bit 15a in the storage unit 13a is sent, and the channel control unit 11 checks the set state of the full bit 15a and performs subsequent writing. Select the storage section 13b and continue.

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 15a of the storage section 13a is detected, the data is read from the storage section 13a, and the data array conversion circuit 16 organizes the data in the order of the trunks of the magnetic disk device 2. When all the data written to the magnetic tape device 3 via the data line 103 has been read from the storage section 13a, the storage section 13a resets the internal full bit 15a according to an instruction from the tape control section 14. Tape control section 1
In step 4, the same process is performed on the storage section 13b, and then on 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, this device uses a cartridge tape device 3A.

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. The magnetic disk control device 1B with an automatic journal function of this embodiment uses a magnetic tape device 3 as a data save device, whereas the magnetic disk control device 1 with an automatic journal function of the embodiment shown in FIG. Therefore, a cassette tape device 3B is used.

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. It goes without saying that the operation is exactly the same as that of device 1.

〔Effect of the invention〕

As explained above, the present invention has the effect of significantly reducing the software load, increasing data integrity, and greatly 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, 1.1A, 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 section, 12...Disk control section, 13a, 13b - Storage section, 14... Tape control section, 15a, 15b - Full Bit, 16... Data array conversion circuit, 101, 102.103 ・Data line, 104...
・It 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; A magnetic disk control device with an automatic journal function, comprising: tape control means for rearranging tracks in the order of track numbers and writing in the magnetic tape device; and an internal bus to which each of the means is connected.