JP3551104B2 - Resource management system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a resource management system that manages the status of allocation of resources such as files to clients in a computer system and performs shared exclusion control.
[0002]
[Prior art]
Conventionally, a computer system has been provided with a resource management system that manages the allocation status of resources such as files to clients and performs shared exclusion control. Files can be shared between clients or used exclusively. Is possible. When the client to which the resource is assigned goes down, the resource management system releases the resource assignment to the client by updating the resource management table to invalidate the resource assignment to the downed client. Was. Alternatively, the resource management table is left in the event of a downtime, and when a resource allocation request is issued from each client after the downtime, a check is made for the presence of a client whose resources conflict with each other.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional resource management system, the resource management table is updated to invalidate all the resources allocated to the downed client. Therefore, it takes time to release all the resource allocations. Hang on. Therefore, during that time, there is a problem that the performance of allocating resources to other clients and releasing resources is degraded.
In addition, when the resource management table is left down during the downtime, and when there is a resource allocation request from each client after the downtime, checking for the existence of a client whose resources are in conflict with each other also causes performance degradation at the time of resource allocation.
The present invention has been made in view of such circumstances, and an object of the present invention is to enable the resource allocation to be released at high speed when a client to which resources are allocated goes down, and that a down occurs. An object of the present invention is to provide a resource management system that does not lower the performance of resource allocation processing to each client later.
[0004]
[Means for Solving the Problems]
In order to solve the above problem, an invention according to claim 1 is set when a client is opened in a resource management system of a computer system having a plurality of clients that share or exclusively use a plurality of resources. A resource management generation management table for holding the resource management generation for each of the plurality of clients, and the resource management generation set when the resource was allocated to the client, and A plurality of resource management table entries corresponding to the resource management generation table and the resource management generation of the client stored in the resource management table entry. Resource management control for determining whether or not the allocation of resources is valid and performing shared exclusive control of the resources Are those formed by and a stage.
According to a second aspect of the present invention, in the first aspect of the present invention, the resource management control means changes the resource management generation of the downed client held in the resource management generation management table when the client goes down. By doing so, there is provided a resource allocation canceling means for collectively canceling the allocation of all resources to the client.
[0005]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the resource management control unit is configured to store the resource management generation management table and the resource management table entry. Resource allocation means for determining whether or not the allocation of the resource to the client is valid according to whether the resource management generations match, and determining whether or not the resource can be allocated to the client; Resource release means for releasing the allocation of the resource from the client by changing the resource management generation of the client held in the resource management table entry.
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the resource management generation management table stores the resource management generation and a status indicating the open / close state of the client. It is characterized by being held together.
According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the resource management control means changes the resource management generation of the client in the resource management generation management table when the client is opened. Means for setting the client in the resource management generation management table, and changing the resource management generation of the client in the resource management generation management table when the client is closed. And a client closing means for setting the state of the client in the resource management generation management table to a closed state.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a resource management system according to one embodiment of the present invention. In this figure, reference numerals 1 and 2 denote clients that request allocation and release of resources such as files, and reference numeral 3 denotes a resource management generation management table (referred to as a shared memory) recorded in a memory shared between the clients (hereinafter referred to as a shared memory). 2), 4 is a resource management table recorded on a shared memory or a control file that can be shared between clients, and 41 is a resource management table entry (see FIG. 3). Then, the clients 1 and 2 respectively hold their own resource management generations 11 and 21 in the memory of the client. Reference numeral 10 denotes a resource management control unit that manages resources, and is capable of accessing the clients 1, 2, the resource management generation management table 3, and the resource management table 4. In the resource management control unit 10, reference numeral 5 denotes a client opening unit that performs initialization when a client is opened, 6 denotes a client closing unit that performs a closing process when a client is closed, and 7 denotes a resource allocation request from a client. A resource allocating unit that performs resource allocation control, 8 is a resource releasing unit that performs resource release control in response to a resource release request from a client, and 9 is a resource allocation that releases resource allocation to a downed client when the client goes down. Release unit.
[0007]
FIG. 2 is a table configuration diagram showing the configuration of the resource management generation management table 3. The resource management generation management table 3 holds the resource management generations 311 and 321 of the clients 1 and 2 and the statuses 31 and 32 of the clients 1 and 2 such as opened and closed.
FIG. 3 is a table configuration diagram showing the configuration of the resource management table entry 41. The resource management table entry 41 holds the resource management generations 411 and 421 when the resources are allocated to the clients 1 and 2 using the allocated resource name as a key.
Note that a plurality of resource management table entries 41 are provided for each resource name as a key.
[0008]
Next, the operation of the resource management system according to the above-described embodiment will be described. First, the client opening unit 5 initializes the resource management generation management table 3 and the resource management table 4 by the time of opening the first client in the resource management system, for example, when starting up the computer system. By this initialization, the resource management generations 311 and 321 of each client 1 and 2 in the resource management generation management table 3 are set to initial values, and the states 31 and 32 of each client 1 and 2 are set to closed. You. When the resource management table 4 is initialized, the resource management table 4 does not have the resource management table entry 41.
[0009]
Next, when the client 1 is opened, the client opening unit 5 changes the resource management generation 311 of the client 1 in the resource management generation management table 3 from the initial value to “D1”, and changes the value of the changed resource management generation 311 “ D1 ”is stored in the resource management generation 11 of the client 1. When the client 1 is opened, the client opening section 5 sets the status 31 of the client 1 in the resource management generation management table 3 to “opened”.
[0010]
Next, at the time of a resource allocation request from the client 1, the resource allocation unit 7 checks whether or not the resource management table 4 has a resource management table entry 41 having the same resource name as the resource allocation request as a key. If there is no resource management table entry 41 using the same resource name as a key, the resource allocating unit 7 creates the resource management table entry 41 using the resource name as a key, and the client 1 in the resource management table entry 41 The value “D1” of the resource management generation 11 of the client 1 is set to the resource management generation 411 of the client 1. Then, the resource is allocated to the client 1.
Here, the operation of the resource allocation unit 7 when the resource management table entry 41 using the same resource name as a key already exists when a resource allocation request is made from the client 1 will be described. This is the case, for example, when the client 2 has already been opened and has been assigned the resource. In this case, the resource allocation unit 7 compares the resource management generations 411 and 421 of each client 1 and 2 in the resource management table entry 41 with the resource management generations 311 and 321 of each client in the resource management generation management table 3. I do. If the resource management generation 421 and the resource management generation 321 of the client 2 match, the allocation of the resource to the client 2 is valid. If they do not match, it is determined that the allocation of the resource to the client 2 has been released. Based on the resource allocation status determined in this way, whether or not the resource can be allocated to the client 1 is determined. This determination is made depending on whether the resource is a shared use target or an exclusive use target. If the resource can be allocated to the client 1, the resource allocation unit 7 sets the value “D1” of the resource management generation 11 of the client 1 to the resource management generation 411 of the client 1 in the resource management table entry 41. , And allocates the resource to the client 1.
[0011]
Next, upon a resource release request from the client 1, the resource release unit 8 searches the resource management table 4 for a resource management table entry 41 having the same resource name as the resource release request as a key. Then, the value of the resource management generation 411 of the client 1 in the resource management table entry 41 is cleared. As a result, the value of the resource management generation 411 does not match the value "D1" of the resource management generation 311 of the client 1 in the resource management generation management table 3, and the resource allocation to the client 1 becomes invalid. When resource allocation to all clients in the resource management table entry 41 becomes invalid, the resource release unit 8 deletes the resource management table entry 41.
Next, when the client 1 is closed, the client closing unit 6 clears the resource management generation 311 of the client 1 in the resource management generation management table 3 and changes the state 31 of the client 1 to closed.
[0012]
Next, an operation when the client 1 goes down in a state where the client 1 is opened and resources are allocated as described above will be described. At this time, the values of the resource management generation 11, the resource management generation 311 and the resource management generation 411 are all "D1". In this case, the resource allocation release unit 9 clears the value of the resource management generation 311 of the client 1 in the resource management generation management table 3. As a result, the value “D1” of the resource management generation 411 in the resource management table entry 41 of the client 1 and the value of the resource management generation 311 in the resource management generation management table 3 do not match. The assignment becomes invalid. Then, even when a plurality of resources are allocated to the client 1, similarly, the value of the resource management generation 311 does not match the value of the resource management generation 411 in the plurality of resource management table entries 41. All resource assignments can be invalidated collectively. The detection of the down of the client 1 may use a method generally used in a computer system.
When the client 1 is opened, if the client opening unit 5 refers to the state 31 of the client 1 in the resource management generation management table 3 and the client 1 is not closed, the resource release unit 8 sets the resource management table 3 The resources of each resource management table entry 41 in the client 4 are released from the client 1 by the method described above. The fact that the state 31 is not closed indicates that the client 1 opened last time has not been normally closed due to a down condition or the like. For this purpose, the resources are released from the client 1 and unnecessary resource management table entries 41 are deleted, so that the resource management table 4 is effectively used.
[0013]
As described above, in the above-described embodiment, whether the resource management generations 311 and 321 in the resource management generation management table 3 and the resource management generations 411 and 421 in the resource management table entry 41 match each other is determined. It is determined whether the assignment is valid. Therefore, when the client 1 or 2 goes down, the resource allocation release unit 9 only changes the resource management generation 311 or 321 in the resource management generation management table 3 and collectively allocates all resources to the client. You can cancel it. Further, even after the client 1 or 2 goes down, it can be similarly determined whether or not the resource allocation to the clients 1 and 2 is valid, so that the performance of the resource allocation processing to each client does not decrease.
In the above-described embodiment, the number of clients of the computer system is two, that is, the clients 1 and 2. However, resources can be similarly managed in a computer system having three or more clients.
[0014]
【The invention's effect】
As described above, according to the present invention, the resource management generation management table and the resource management table entry are provided, and the allocation of resources to the client is effective depending on whether or not the resource management generations held by each resource match. It is determined whether or not. Therefore, when a client goes down, all resources are allotted to the client at once by simply changing the resource management generation in the resource management generation management table. The effect which can be implemented in this way is acquired.
Further, even after the client goes down, it is possible to determine whether the resource allocation to the client is valid or not in the same manner, so that the effect of the performance of the resource allocation processing to each client does not decrease.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a resource management system according to an embodiment of the present invention.
FIG. 2 is a table diagram showing a configuration of a resource management generation management table 3 according to the embodiment.
FIG. 3 is a table diagram showing a configuration of a resource management table entry 41 according to the embodiment.
[Explanation of symbols]
1, 2 client 3 resource management generation management table 4 resource management table 5 client opening unit 6 client closing unit 7 resource allocation unit 8 resource release unit 9 resource allocation release unit 10 resource management control unit 11, 21 resource management generation 41 resource management Table entry

Claims (5)

In a resource management system of a computer system having a plurality of clients that use or exclusively use a plurality of resources,
A resource management generation management table that holds, for each of the plurality of clients, a resource management generation set when the client is opened;
Holding the resource management generation set when the resource was allocated to the client, a plurality of resource management table entries corresponding to the plurality of resources,
By determining whether or not the resource management generations of the client held in the resource management generation management table and the resource management table entry match, it is determined whether or not the allocation of the resource to the client is valid. Resource management control means for performing shared exclusive control of the resources,
A resource management system comprising: When the client goes down, the resource management control means changes the resource management generation of the downed client held in the resource management generation management table to release all resources to the client at once. 2. The resource management system according to claim 1, further comprising a resource allocation release unit that performs the resource allocation. The resource management control means determines whether the allocation of the resource to the client is valid depending on whether or not the resource management generations of the client stored in the resource management generation management table and the resource management table entry respectively match. Resource allocation means for determining whether or not the resource can be allocated to the client;
Resource release means for releasing the allocation of the resource from the client by changing a resource management generation of the client held in the resource management table entry;
The resource management system according to claim 1, further comprising: 4. The resource management system according to claim 1, wherein the resource management generation management table holds both the resource management generation and a status indicating the opening and closing of the client. 5. The resource management control means changes the resource management generation of the client in the resource management generation management table at the time of opening the client, sets the resource management generation to the client, and sets the resource management generation of the client in the resource management generation management table. Client opening means for setting the state to the open state;
Client closing means for changing the resource management generation of the client in the resource management generation management table when closing the client, and for setting the state of the client in the resource management generation management table to the closed state;
The resource management system according to claim 4, comprising:

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