JPH01175022A - Common disk control device - Google Patents

Abstract

PURPOSE:To simultaneously update disk files to be used by plural systems in common by controlling the occupation/release of an independent resource by a command disk device when the resource independent of plural systems exists. CONSTITUTION:In case of referring/updating a record of a file in a disk, a system 11 outputs a record occupation request to a common disk control device 15. The device 15 searches a control table, and if the disk 13 is not occupied, answers the success of disk occupation to the system. When the disk has been already occupied, the device 15 registers the system in the control table as a queue system and answers non-registration to the system. When the system is allowed to release the occupation of the record, the device 15 removes the record to be released from the control table, and a system in a queue state exists, the system is registered as an occupation system and occupation completing information is outputted to the system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Field of Industrial Application) The present invention relates to a shared disk control device that controls the allocation of a shared resource device that exists independently and is shared by a plurality of systems.

(Prior Art) When a plurality of systems share an independent resource device, such as a disk device, there has conventionally been no effective shared disk control device.

(Problem to be Solved by the Invention) Therefore, there is a problem that files in a shared disk device cannot be updated simultaneously by two systems.

In order to solve this problem, it is possible to enter one system via the network between the systems and update the files at the same time, but in this case, there is no time loss while going through the network. The problem is that it is large.

The present invention has been made in view of the above points, and its object is to provide a shared disk control device that controls the allocation of a shared resource device that exists independently and is shared by a plurality of systems.

[Components of the Invention (Means and Actions for Solving Problems) A shared resource device that exists independently and is shared by multiple systems;
a resource management unit that manages a plurality of resources of the shared resource device, the resource management unit accepts requests for access to the shared resource device from the plurality of systems, and when the shared resource device is not exclusively allocates the shared resource device to the requesting system, stacks the resource request data when the shared resource device is exclusive, and stacks the resource request data when the shared resource device is no longer exclusive. The shared resource device is made to be exclusively used by the source requesting the resource by extracting the resource request data.

(Embodiment) A shared disk control device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a shared disk device.

In the figure, 11 is a first system, and 12 is a second system that exists independently of the first system.

A disk 13 is provided as a resource shared by the first system 11 and the second system 12. Writing/reading to/from the disk 13 is controlled by a disk controller 14. Further, the allocation of files on the disk 13 is performed by the shared disk control device 15.

Next, the operation of an embodiment of the present invention configured as described above will be explained. When referencing/updating records of files in the disk 13, the system outputs a record exclusive request to the shared disk controller 15 with a system identifier, file identifier, and record identifier, as shown in the flowchart of FIG. There is. The shared disk control device 15 searches a management table as shown in FIG. 4 (step S1), and if the disk 13 is not occupied, registers the system identifier etc. in the management table to make it exclusive. The successful answer for disk exclusive use is output to the system. (Steps S2 and S3). On the other hand, if the system is already in an exclusive state, it is registered as a waiting system on the management table, and a response of non-registration is output to the system (steps S4 and S5). The management table in Figure 4 shows the record with the identifier r20015J of the file with the identifier r4'0QOLJ as "l".
The systems ``O'' and ``11'' are in a waiting state.

On the other hand, if the system releases the exclusive use of the record,
As shown in the flowchart of FIG. 3, a record release request is output to the shared disk control device 15. In response, the shared disk control device 15 removes the record to be released from the management table and searches for a waiting system (step 511). Here, if there is a waiting system, the waiting system is registered as an exclusive system, and an exclusive use completion notification is output to the system (step S12, 313).

On the other hand, if it is determined in step S11 that there is no waiting system, the exclusive request is deleted from the management table and the process is terminated.

[Effects of the Invention] As detailed above, according to the present invention, when resources are available independently from multiple systems, the shared disk control device controls the exclusive use/release of the resources. It is possible to provide a shared disk control device that can simultaneously update disk files shared by two systems.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a shared disk control device according to an embodiment of the present invention, FIGS. 2 and 3 are flowcharts showing the operation of the embodiment, and FIG. 4 is a diagram showing the state of a management table. be. 11.12...System, 13...Disk, 1
4... Disk controller, 15... Shared disk control device. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4

Claims (1)

[Claims] A shared resource device that exists independently and is shared by a plurality of systems, and a resource management unit that manages a plurality of resources of the shared resource device, and the resource management unit manages the shared resources from the plurality of systems. Accepts device access requests,
If the shared resource device is not exclusive, the shared resource device is allocated to the requesting system, and if the shared resource device is exclusive, the resource request data is stacked, and the shared resource device is not exclusive. A shared disk control device characterized in that, when the stacked resource request data is released, the stacked resource request data is taken out and the resource request source is made to exclusively use the shared resource device.