JPS5850613A - Control system for magnetic tape - Google Patents

Abstract

PURPOSE:To avert the disturbance in the operation of a channel device owing to the errors generated in a magnetic tape device by providing a data buffer and a retry control part to a control device for magnetic tapes, and processing a retry with the control device for magnetic tapes. CONSTITUTION:When a processing unit 1 write data in a magnetic tape device 4 via a channel contorolling device 2, the unit 1 and the device 2 transfer the data for one block to a buffer 5. When an error is generated in the magnetic tape device upon completion of the transfer, a control part 3-1 communicates the same with a control part 6 for retry and repeats the retry until the retry attains required times. The part 3-1 gives an instruction for the retry, and instructs the erasure of the already written data by running the device 4 backward by one block. By the repetition of the above operations, the writing status of the device 4 is stored and the writing is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape control system, and more particularly, to a magnetic tape control system in which a magnetic tape controller generates a 900 MHz signal and controls it by a magnetic tape controller.

Electronic computer and channel A/control device and magnetic tape, 1i
Electronic computer systems consisting of Ij@ devices and magnetic tape devices are used in various places and are not effective, and the magnetic tapes may become smeared due to handling. Due to this wear or damage, the magnetic tape device may generate error when reading data, which may impede system operation. As a countermeasure, these errors are checked by various means, and a part of the error is retried (redo buoy) to quickly resolve the problem.When an error occurs, the magnetic tape in the error range is reversed one block. In the case of resetting, the data at t4- is removed by 1 and reheating is attempted, and in the case of reading, re-reading is performed after reversing. When this error occurs, data is exchanged every moment on the magnetic tape control table: f and channel A/control a i 1f i#
The general system is that Therefore, when an error occurs, the load on the channel control device is increased to perform redo buoy processing, and the operation of the input/output device connected to the channel control device is hindered.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to fix the magnetic tape device in a magnetic tape control device so that the operation of the channel device is not hindered by the FF generated in the magnetic tape device. Its purpose is to provide a magnetic tape control system. Briefly explaining the present invention, the present invention is characterized in that a magnetic tape control device is provided with a data buffer for storing data and a retry control section, and the retry processing is performed by the magnetic tape control device.

Preferred specific examples for carrying out the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the magnetic tape control system of the present invention, where l is a processing device, 2 is a channel control device, 3 is a magnetic tape control device,
4 is a magnetic tape ring, 5 is a buffer circuit, and 6 is a retry control unit.

FIG. 2 is a flowchart showing the operation of the present invention.
3 will be explained below with reference to FIG. In FIG. 1, processing device 1 and channel 1ilJ#device 2 are expressed as υ1, but there is a channel /L'
In some cases, the control device 2 is built-in. The buffer buffer 5 assigned to the magnetic tape control device 3 has a capacity of 64 kilobytes, which is equivalent to one block of data processed by the magnetic tape device 4. Is processing device 1 a channel control device? The case where data is infiltrated into the magnetic tape device 4 via the magnetic tape device 4 will be explained based on Z2, item (a). The A embedded 1i11, channel Iv, and 1ilJ controller transmit l blocks worth of hidden data to the buffer circuit 5. After the transfer is completed, the tlJ controller 3-1 transfers the magnetic χ tape device, ! When an error occurs on the magnetic tape i[, which writes the data of the buffer circuit 5 to □4, the control unit 3-1 tries again, ill 8
It notifies the section 6 to that effect and gives an indication to both sections 6 that they will try again, and also reverses the magnetic tape device 4 by one block to complete the pre-recording process. The second opening) is a case where the magnetic tape device 4 performs reading, and the buffer circuit 5 is the location where the read data is stored, and the data 1
The other steps are the same as in the 1-inclusive case, except that the previous steps are eliminated.

As is clear from the above if, the present invention performs magnetic tape control for retry processing of magnetic tape 1. The error handling is performed by the magnetic tape control device without data transfer during retry, which makes the process simpler and easier.
This is a magnetic tape control method that does not interfere with the operation of the JJ device. If the present invention is applied to Ichiko Kei Maniki V Step, there will be no overflow during data transfer and the channel/l
'The load on the IIJ control unit is - 100%, which has many advantages in terms of system operation.

[Brief explanation of drawings]

FIG. m1 is a block diagram of an embodiment of the magnetic tape control system of the present invention, and FIG. 2 is a flowchart of one embodiment of the present invention. In the figure, 1 is a processing device, 2 is a channel, 411J
d device, 3 a magnetic tape ItlJ control device, 4 a magnetic tape device, 5 a buffer circuit, and 6 a retry control section.

Claims (1)

[Claims] An anaerobic tape system in which an error occurring in a magnetic tape device of a system consisting of an electronic computer, a channel control device, a magnetic tape control device, and a magnetic tape device is rewritten by the d child computer or the channel control device. 1. A magnetic tape control system, comprising: a data buffer try control unit for storing data in a magnetic tape control device; and the redo buoy is performed by the magnetic tape control device.