JPS6217829A - Magnetic disk control system - Google Patents

Abstract

PURPOSE:To prevent normal information processing time from restriction by transferring stored contents corresponding to a stored block address during the period from the end of data writing/reading to the start of the succeeding data writing/reading. CONSTITUTION:When a transfer instruction 102 is inputted from a host processor to a register 2 and a control part 4, a block address included in the transfer instruction 102 is stored in a register 2. At the end of writing or reading operation of a disk device 8, a timer 11 is excited by an end signal 130 outputted from the control part 4. Then, the block address is inputted from the register 2 to the control part 4 on the basis of a timer overflow detecting signal 134. Then, commands 108, 110, 112 are sent from the control part 4 to a buffer memory 6, the disk device 8 and a backup memory 10 respectively to execute the transfer instruction 102.

Description

[Detailed description of the invention]

W Technique 1 The present invention relates to a magnetic disk control system, and in particular controls the mutual movement of storage contents between a fixed magnetic storage device and a backup storage device in order to preserve the storage contents of a fixed magnetic disk device. Regarding magnetic disk control methods. BACKGROUND OF THE INVENTION In recent years, as the storage density of magnetic disk drives has increased, fixed magnetic disk drives have come into widespread use in order to improve reliability and durability of the devices. However, on the other hand, such fixed magnetic disk devices have a structure in which the magnetic disk that is the storage medium cannot be replaced, so if the storage contents are destroyed due to an accident, it will be impossible to restore them. There is a platform that makes business processing impossible for the entire information processing system that uses it. In order to prevent such serious accidents, in information processing systems that use fixed magnetic disk drives (hereinafter referred to as disk drives), backup storage devices such as floppy disk drives and magnetic tape drives (usually This is called a backup medium), and the storage contents (programs and data) of the disk device are transferred and stored on the backup medium.In case the storage contents of the disk device are When the disk device is destroyed, a method is used to preserve the storage contents of the disk device by reading it from a backup memory and rewriting it once. In a conventional information processing system, the transfer memory operation to the backup memory described in 1-[] is carried out independently under the business operations of [].

[This is carried out, but since this transfer and storage operation requires a considerable amount of time, the normal business processing time of 1F4 is limited to [-1]. As the storage capacity of a disk device increases, it tends to become less obtrusive. OBJECTS OF THE INVENTION 1] The purpose of the present invention is that the normal business processing time of the information processing system is not limited by the operation of transferring memory contents to a backup mailer, and therefore the system 7" lx It is an object of the present invention to provide a magnetic disk control unit formula (4, Fixed type...
Magnetic disk control that controls the transfer of memory contents between the disk and the supporting storage device! I]
7'J type, storage means for temporarily storing one 711 address of the memory content to be transferred in response to a memory content transfer command from the upper level printer; means for detecting the end of execution of a write/read command for the fixed edge magnetic disk/7-mounted data;
The present invention is characterized in that an instruction for transferring storage contents that increments a block address in the storage means by + or 6 is executed until the start of execution of a read instruction. Embodiments of the present invention will now be described in detail with reference to drawings -C. A block diagram of one embodiment of the present invention is shown in FIG. Referring to FIG. 1, the register 112 receives a transfer command (hereinafter referred to as ``5AVE'') 102 from the 1st processing device cocoon.
:/ The block address of disk device 8 included in the code (
It has the role of storing information currently being processed by the disk device (designated address of fl) and sending it to the control unit 4 in response to an operation command 106 from the control unit 4. Buffer memory 6 is disk W If! 8 to backup memory 10 (mai)
This is responsible for temporarily storing the storage contents when transferring the storage contents from the backup memory 10 to the disk device 8). The control unit 4 also receives a '5AVE' command 102 and a write/read command (hereinafter referred to as 'R/en') from the host processor.
(abbreviated as “command”) 104 and write data 12
0 is received and register 2. Buffer memory 6° Operation command to disk device 8 and backup memory 106.10
8.110 and 112 and instructs their operations. Also, the timer 11 is activated by the end of the "'R/W" = i mant, and is reset by receiving the next 'R/W'' command.11FJ!j counter indicates the timer A-bar flow The detector 12 has the role of detecting when the sweet time counter 11 reaches a predetermined amount of candy. - When '5AVE' 1 command 102 is input to register 2 and 1t11 (incorporated) unit 4 from the upper processing unit, register 2 stores the block address included in the '5AVE' command. It waits for a command from the control section 4. At this time, when the "'R/14" command 104 is input to the control unit 4 and the writing or reading operation of the disk device is being performed, the control unit 4 suspends execution of the "5AVE" Tl command (second Figure reference mark month a). Then, the timer is activated by the end signal 130 generated at the end of this write or read operation, and after a predetermined time has elapsed (second
Receives the block address from the register 2 to the block address (see figure) and transfers it to the buffer memory 6, disk device 8, and backup memory 1O.
[B] Execute the cloak (refer to Figure 2, reference numeral C). While this transfer operation is being executed, the next 'R/W' command 104
is input to the control unit 4, the control unit 4 issues commands to the buffer memory 6, the disk device 8, and the backup memory 10, interrupts the transfer operation at the break of the block being transferred, and restarts the disk device 8. (reference numeral 2 in FIG. 2). When this write or read operation is completed, the timer is started again, and the suspended transfer operation is executed again by the timer overflow []-detection (reference numeral E in FIG. 2). On the other hand, if the timer is started and the 'R/W':] mantle is accepted before the timer overflow is detected,
A write or read operation is performed without performing a transfer operation (see reference numerals in FIG. 2). By repeatedly suspending and resuming such transfer operations, the storage contents of the disk device can be transferred to the backup memory using the pause time during writing and reading operations of the disk device for normal business processing. It can be memorized. Therefore, by using the magnetic disk device control method I) of the present invention, the information processing system is not exclusively used for transfer operations, so the system can be used more efficiently and economically. This has the effect of configuring a complete information processing system.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a timing chart showing the operation of the blocks in FIG. Explanation of symbols of main parts 2...Register 4...Control unit 6...Buffer memory 8...Fixed magnetic disk device 10...
・Backup memory 11...Timer

Claims (1)

[Claims] A magnetic disk control method that controls the mutual transfer of storage contents between a fixed magnetic disk device and a backup storage device, and is a block of storage contents to be transferred in response to a storage contents transfer command from a host device. A storage means for temporarily storing an address and a means for detecting the completion of execution of a data write/read command from the host device to the fixed magnetic disk device are provided, and in response to the completion of the execution, the next data A magnetic disk control system characterized in that an instruction to transfer storage contents corresponding to a block address in the storage means is executed before execution of a write/read instruction is started.