JPS63201712A - Dual type file subsystem - Google Patents

Abstract

PURPOSE:To facilitate a state management of a subsystem by executing an operation being contrary to main/sub file storage devices, by one instruction, even in case of executing said operation. CONSTITUTION:One pair is constituted of two sets, and provided with file storage devices 1, 2 in which one of them, and the other have been set to a main state and a sub-state, respectively, and a file controller 3 for outputting an operation command containing an operation mode for operating said main and/or sub file storage devices 1, 2, to a pair of file storage devices 1, 2. The file storage devices 1, 2 are provided with an operation mode decoding means 21 for recognizing an operation mode from the file controller 3, an instruction decoding means 22 for decoding means 22 for decoding the operation command as an instruction peculiar to each operation mode, based on the operation mode recognized by this means 21, and an operation executing part 23 for executing the operation, based on its signal. In such a way, a state management of a subsystem is facilitated.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a duplex file subsystem that has a pair of file storage devices and stores the same file data in each of these file storage devices, and particularly relates to The present invention relates to a duplex file subsystem that simplifies the operation procedure when a file storage device performs different operations.

(Prior Art) In general, this type of duplex file subsystem includes two file storage devices forming a pair, and a file control device that controls writing and reading of file data to and from these file storage devices. ing.

Conventionally, the file control device is made to recognize the relationship between a pair of file storage devices, and selectively controls one or both of the file storage devices.

Therefore, for example, when changing the internal state of one file storage device, the file control device selects only that file storage device, establishes the connection, and then performs the internal state changing operation.

In addition, the selection of file storage devices is processed according to the unique address within the system that each file storage device has, without using the primary or secondary mode.

(Problems to be Solved by the Invention) In the conventional duplex file subsystem described above, it is necessary to select a file storage device in advance and establish a connection before writing or reading file data to or from the file storage device. In most cases, the selection was made based on the address of the file storage device, so there was a problem in that the state management of the sub-7 stems was complicated.

In view of these problems, the inventor separately determined the connection between the file control device and two primary and secondary file storage devices in advance, and specified the primary and secondary modes when issuing various commands. A redundant file subsystem has been proposed that allows the status of the subsystem to be easily managed by simply doing the following: This separately proposed duplex file subsystem has the effect of simplifying the operating procedure, especially when operating only one file storage device or when performing a common operation on both file storage devices. ing.

However, if you want each file storage device to perform different operations, for example, if the positive file storage device's flag is %11.
When changing the state in which the secondary file storage device is set to %Op, it is necessary to separately issue a reset instruction to the primary file storage device and a set instruction to the secondary file storage device.

The present invention was conceived in consideration of these circumstances, and provides a duplex system that allows each file storage device to perform different operations simply and easily based on primary and secondary mode specifications. The purpose is to provide a file subsystem.

(Means for solving the problem) In order to achieve the above object, the duplex file subsystem of the present invention constitutes a pair of two devices, and one of them is in the primary state and the other is in the secondary state. a storage device; and a file control device that outputs an operation command including an operation mode for operating the primary and/or secondary file storage device to the pair of file storage devices, and the file storage device includes: an operation mode decoding means for recognizing the operation mode from the file control device; an instruction decoding means for decoding the operation command as a command unique to each operation mode based on the operation mode recognized by the operation mode decoding means; The configuration includes an operation execution section that executes an operation based on a signal from the instruction decoding means.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Figure 1 is a block diagram of the duplex file subsystem according to this implementation, Figure 2 is a block diagram of the file storage device in the system, and Figure 8 explains the operation command signal output from the file control device in the system. It is a diagram.

In FIG. 1, 1 and 2 are file storage devices that store file data, and 3 is a file control device that controls writing and reading of file data to and from the file storage devices 1 and 2 based on commands from a host device. .

One of the file storage devices 1 and 2 is specified as being in a primary state and the other being in a secondary state. In this embodiment, the following explanation will be made assuming that 1 is a primary file storage device and 2 is a secondary file storage device. In addition, these file storage devices 1
．． 2 and the file control device 3 are connected by a connection means 4, and commands and file data sent from the file control device 3 are transmitted to each file storage device 1.2 via this connection means 4. be done. The operation command signal sent from the file control device 3 is divided into an operation field 31 and a mode field 32, as shown in FIG. The operation field 31 contains the file storage device 2.
．． 3 is shown the action to take. mode field 32
indicates the operating mode of whether the operating command is directed to the primary file storage device 1, to the secondary file storage device 2, or to both file storage devices 1.2.

As shown in FIG. 2, the file storage devices 1 and 2 are composed of a mode decoder 21, an instruction decoder 22, and an operation execution unit 23. The mode decoder 21 recognizes the operation mode in the operation command signal a sent from the file control device 3, and indicates which operation mode the operation command signal a specifies, primary, secondary, or both. Outputs mode signal. The instruction decoder 22 recognizes in advance whether it is the primary file storage device 1 or the secondary file storage device 2, and the state of the operation execution unit 23.

Then, based on the mode signal S from the mode decoder 21, the operation field in the operation command signal a from the file control device 3 is decoded as a unique command to itself, and an operation command signal C is output. However, when the mode signal does not indicate its own mode, the operation instruction signal C is not output. The operation execution unit 23 executes an instruction based on the operation instruction signal C from the instruction decoder 22.

Next, the operation will be explained.

Now, assume that the flag in the primary file storage device 1 is changed from 10# to 111I, and the same flag in the secondary file storage device 2 is changed from %IF to %OIl.

File control device 31d, each file storage device 1゜2!
/C, set the operation field 31 to east flag change r,
The operation command signal a is sent out with the mode field 32 set to main/sub I.

Each file storage device 1゜2 that received the operation command signal a,
When the mode decoder 21 decodes the mode field 32 and recognizes the operation mode of the specified electrician/sub I, the recognition result is output as a mode signal.

The instruction decoder 22 in the positive file storage device 1 is
He knows in advance that his mode is electrician I. Since the mode signal includes its own mode, based on this, the operation field 31 (flag change) of the operation command signal a is decoded as a unique command for itself, and the operation instruction indicating turtle flag set F is decoded. Outputs signal C.

The operation execution unit 23 in the positive file storage device 1 changes the flag from 0# to %I based on the operation instruction signal C.
Change to N.

On the other hand, the instruction decoder 2 in the secondary file storage device 2
2, whose mode is east side r in advance, and
The operation execution unit 23 recognizes that the flag state is %II'. Since the mode signal includes the own mode, based on this, the operation field 31 (flag change) of the operation command signal a is decoded as a unique command for the self, and an operation instruction indicating turtle flag reset〆 is decoded. Outputs signal C. The operation execution unit 23 that operates on the secondary file storage device 2 sets the flag to % based on the operation instruction signal C.
Change from II' to %O#.

In addition, when operating only the positive file storage device 1, the mode field 32 of the operation command signal a is set to I only for the electrician.
If only the secondary file storage device 2 is to be operated, it is sufficient to similarly close only one secondary file storage device 2. In addition, when the operation command to one or both file storage devices is a single one, for example, when changing the flag from %QII to Kame1#, the operation field 31 of the operation command signal a is set to 1 flag! If you want to change the flag from 11F to %OIf, you can similarly change it to 1 flag reset) IF.

(Effects of the Invention) As explained above, the present invention enables file storage by a file control device to perform an operation that is exclusive to the primary and secondary file storage devices by making it possible to execute the operation using the - command. Device management can be performed as a pair of primary and secondary devices, which has the effect of making it easier to manage the status of subsystems.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a duplex file subsystem according to an embodiment of the present invention, Fig. 2 is a block diagram of a file storage device in the same system, and Fig. 8 is a configuration of an operation command signal from a file control device in the same system. It is a diagram. 1.2...File storage device 3, fist, file control device 4...Connection means 21...Mode decoder 22...Command decoder 23...Operation execution unit

Claims (1)

[Claims] Two file storage devices constitute a pair, one of which is in the primary state and the other with the secondary state, and an operation command including an operation mode for operating the primary and/or secondary file storage device is sent to the pair of file storage devices. a file control device that outputs to a file storage device; and an operation mode decoding means for the file storage device to recognize an operation mode from the file control device; and an operation recognized by the operation mode decoding means. A duplex file subsystem comprising an instruction decoding means for decoding the operation command as an instruction unique to each operation mode based on the mode, and an operation execution section for executing an operation based on a signal from the instruction decoding means.