JPH1027151A - Input/output processing system and input/output processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a peripheral device such as a small computer system interface(SCSI) device having no exclusive control function as a peripheral device even when two or more I/O processors are used. SOLUTION: When a master ID receiving part 21 receives host ID and device ID transferred from a central processing unit(CPU) 1A, a device ID selecting part 202 selects the device ID and a host ID selecting part 203 selects the host ID. A host ID reference part 206 refers to device ID stored in an ID storing part 205 correspondingly to the device ID selected by the selecting part 202 and a host ID operating part 207 executes operation based on the host ID direction by the reference part 206 and the host ID selected by the selecting part 203. A host ID updating part 204 updates the host ID stored in the ID storing part 205 in accordance with the operated result. A slave ID transmitting part 208 transmits the host ID and transmission ID to an I/O processor 2B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output processing system and an input / output processing device for a computer device, and more particularly, to exclusion of access to a peripheral device when two or more input / output processing devices access a common peripheral device. The present invention relates to an input / output processing system and an input / output processing device for performing control.

[0002]

2. Description of the Related Art In a conventional input / output processing device connected to a central processing unit by an upper interface and connected to a peripheral device by a lower interface, when a common peripheral device is accessed by two or more input / output processing devices, The exclusive control is performed using the exclusive control function of the peripheral device. This exclusive control function is also called a device cross-call function, and aims to increase availability so that peripheral devices can access even when a failure of an input / output processing device or a path failure occurs in a large-scale system, and to improve a certain input / output function. The object is to enhance the operability so that the peripheral device can be accessed from another input / output processing device even when the frequency of access from the output processing device is high.

Such a method is widely used especially in a magnetic disk device which is one of peripheral devices, and is a well-known technique. For example, JP-A-64-15850 discloses that
2. Description of the Related Art In a magnetic disk device having a device cross-call function, the number of signal lines between magnetic disk control adapters is improved from three to two while utilizing the exclusive control function of the magnetic disk control adapter in the magnetic disk device. It is assumed that the magnetic disk device as a peripheral device has an exclusive control function.

The prior art will be described with reference to FIG. FIG.
, 1A and 1B are a central processing unit, 5A and 5B are magnetic disk control devices, and 6 is a magnetic disk device. The central processing unit 1A and the magnetic disk control unit 5A are connected by an upper interface 10A, and the central processing unit 1B and the magnetic disk control unit 5B are connected by an upper interface 10B. The magnetic disk control adapter 61A is an adapter that controls the lower interface 11A with the magnetic disk controller 5A. The magnetic disk control adapter 61B is an adapter that controls the lower interface 11B similarly to the magnetic disk control adapter 61A. It controls the magnetic disk drives 66A to 66N. The magnetic disk control adapters 61A and 61B are connected by a cross call interface 63 for exclusively controlling the acquisition of the control right of the magnetic disk drives 66A to 66N. The request signals 64A and 64B are signals for requesting the other magnetic disk control adapter. The reset signal 65 is a signal for resetting the request request. Exclusive control circuits 62A and 62B
Is a circuit included in the magnetic disk control adapters 61A and 61B.

The request signals 64A and 64B, the reset signal 65, and the exclusive control circuits 62A and 62B
As a result, when the same magnetic disk drive is activated, exclusive control for determining the right to use the cross call interface 63 is performed.

In such a configuration, when the magnetic disk controllers 5A and 5B are activated in different magnetic disk drives, the magnetic disk control adapters 61A and 61B respectively access the designated magnetic disk drives and control the magnetic disk drives. A write process of data transferred from the devices 5A and 5B or a process of transferring each data read from a predetermined magnetic disk drive to the magnetic disk controllers 5A and 5B is performed.

Two magnetic disk controllers 5A and 5
B starts the same magnetic disk drive, the magnetic disk control adapters 61A and 61A
Exclusive control for determining which of B controls the magnetic disk drive is performed. Prior to this, exclusive control for determining the right to use the cross call interface 63 is performed.

Two magnetic disk controllers 5A and 5
B, if the same magnetic disk drive, for example, the magnetic disk drive 66A, is activated before and after in time, the magnetic disk control adapter on the side that has activated first activates the right to use the cross-call interface 63. To win.

If the magnetic disk controllers 5A and 5A
If the same magnetic disk drive 66A is simultaneously activated from B, the magnetic disk control adapter (referred to as 61A) having a higher priority acquires the right to use the cross call interface 63.

When the right to use the cross call interface 63 is determined by the exclusive control, the magnetic disk control adapter that has obtained the right to use becomes the main, the other magnetic disk control adapter becomes the subordinate, and the main magnetic disk control adapter becomes the subordinate. To the magnetic disk control adapter through the cross call interface 63
Various controls for exclusive control for acquiring the control right of A are performed.

When the control right of the magnetic disk drive 66A is obtained, the main magnetic disk control adapter accesses the magnetic disk drive 66A and performs a predetermined read / write process (see Japanese Patent Application Laid-Open No. 64-15850).

As described above, in the conventional input / output processing device, when a common peripheral device is accessed from two or more input / output processing devices, the exclusive control function of a peripheral device such as a magnetic disk device is used. Had been controlled. That is, information related to exclusive control for accessing a common peripheral device is not directly transferred between input / output processing devices.

In this conventional method, since the input / output processing device does not perform exclusive control of a common peripheral device, a general SCSI (Small) having no exclusive control function in the peripheral device is used.
Computer Systems Interfac
e) The device or the like could not be connected.

Therefore, in the conventional method, when a common peripheral device is accessed from two or more input / output processing devices, a peripheral device such as a general SCSI device having no exclusive control function is used as a common peripheral device. There was a problem that it could not be connected.

Of course, the exclusive control method described in Japanese Patent Application Laid-Open No. 64-15850 has a similar problem.

[0016]

A first problem is that, in a conventional input / output processing device, when two or more input / output processing devices access a common peripheral device, a peripheral device having no exclusive control function is used. Is unable to connect. The reason is that the input / output processing device does not perform exclusive control of the common peripheral device.

A first object of the present invention is to enable a peripheral device such as a general SCSI device having no exclusive control function to be connected as a common peripheral device even when two or more input / output processing devices are used. To provide an input / output processing device.

A second object of the present invention is to enable connection of a peripheral device such as a general SCSI device having no exclusive control function as a common peripheral device even when two or more input / output processing devices are used. To provide an exclusive control device.

A third object of the present invention is to allow a general peripheral device such as a general SCSI device having no exclusive control function to be connected as a common peripheral device even when two or more input / output processing devices are used. To provide an input / output processing system.

[0020]

According to the present invention, there is provided an input / output processing device connected to a higher-level device via a higher-level interface and connected to a peripheral device via a lower-level interface. ID storage means for storing a higher-level device ID of a higher-level device using the peripheral device; higher-level ID receiving means for receiving a higher-level device ID and a peripheral device ID transferred from the higher-level device before accessing the peripheral device; A higher-level ID selecting means for selecting a higher-level device ID received by the higher-level ID receiving means;
D Device I for selecting peripheral device ID received by receiving means
D selection means, ID reference means for reading a high-order device ID stored in the ID storage means corresponding to the peripheral device ID selected by the device ID selection means, and high-order device read by the ID reference means ID operation means for performing an operation from the ID and the upper apparatus ID selected by the upper ID selection means, and the apparatus I according to the operation result of the ID operation means.
D corresponding to the peripheral device ID selected by the D selecting means.
D, the upper device ID stored in the
ID updating means for updating to the higher-level device ID selected by the D selecting means; and upper-level device ID and peripheral device ID for the lower-level interface according to the calculation result of the ID calculating means.
, A non-permission report unit for notifying the higher-level device of the non-permission of the peripheral device in accordance with the calculation result of the ID calculation unit, a higher-level device ID and a peripheral device transferred from the lower-level interface. Lower ID receiving means for receiving a device ID, update report means for reporting to a lower interface that a higher device ID stored in the ID storage means has been updated, and update receiving means for receiving an update report from a lower interface And permission reporting means for reporting permission to use the peripheral device to a higher-level device according to the output from the update receiving means and the ID updating means.

The input / output processing device of the present invention is connected to a higher-level device via a higher-level interface, and is connected to the peripheral device via a lower-level interface. Upper ID receiving means for receiving the upper device ID and the peripheral device ID to be received, lower device ID transmitting means for transmitting the upper device ID and the peripheral device ID received by the upper ID receiving device to the lower interface, and reporting from the lower interface. And a report transmitting means for transmitting the report received by the report receiving means to the host device.

Further, the exclusive control device according to the present invention is an exclusive control device connected to two or more input / output processing devices and a lower interface to which the peripheral device is connected. ID storage means for storing a higher-level device ID of a higher-level device used; lower-level ID receiving means for receiving a higher-level device ID and a peripheral device ID transferred from a lower-level interface; A high-order ID selecting means for selecting a device ID, and a peripheral device I received by the low-order ID receiving means.
A device ID selecting means for selecting D, an ID reference means for reading a higher-level device ID stored in the ID storage means corresponding to the peripheral device ID selected by the device ID selecting means, and a reading means for reading the ID. ID operation means for performing an operation from the issued upper apparatus ID and the upper apparatus ID selected by the upper ID selection means, and a peripheral device ID selected by the apparatus ID selection means in accordance with the operation result of the ID operation means
The upper device ID stored in the ID storage means corresponding to the upper device ID selected by the higher ID selecting means
ID updating means for updating to the lower-level interface, non-permission reporting means for reporting the non-permission of the peripheral device to the lower interface in accordance with the calculation result of the ID calculating means, and upper-level device ID stored in the ID storage means. Permission reporting means for reporting the update to the lower interface as permission to use the peripheral device.

Still further, the input / output processing system of the present invention includes an input / output processing device connected to a higher-level device via a higher-level interface and connected to a peripheral device via a lower-level interface, and an exclusive control device connected to a lower-level interface. In the input / output processing system having the above, the input / output processing device includes a high-order ID receiving means for receiving a high-order device ID and a peripheral device ID transferred from a high-order device in advance before accessing the peripheral device; Lower ID transmitting means for transmitting the received upper device ID and peripheral device ID to the lower interface, report receiving means for receiving a report from the lower interface, and transmitting the report received by the report receiving device to the higher device. The exclusive control device identifies a peripheral device for each peripheral device ID of the peripheral device. The higher-level device I of the use to which the host device
ID storing means for storing the D, lower ID receiving means for receiving the upper device ID and the peripheral device ID transferred from the lower interface, and higher ID selecting means for selecting the higher device ID received by the lower ID receiving device A device ID selecting means for selecting a peripheral device ID received by the lower ID receiving means; and a higher device ID stored in the ID storage means corresponding to the peripheral device ID selected by the device ID selecting means. ID reference means for reading the data, ID calculation means for performing calculation from the upper device ID read by the ID reference means and the higher device ID selected by the upper ID selection means, and The device I
D corresponding to the peripheral device ID selected by the D selecting means.
D, the upper device ID stored in the
ID updating means for updating to a higher-level device ID selected by the D selecting means, non-permission reporting means for reporting a non-permission of a peripheral device to a lower-level interface according to a calculation result of the ID calculating means, Permission reporting means for reporting to the lower interface that the upper device ID stored in the storage device has been updated, as the use permission of the peripheral device.

[0024]

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the input / output processing system according to the first embodiment of the present invention. In the input / output processing system according to the present embodiment, when the common peripheral device 3 is accessed from two or more input / output processing devices 2A and 2B, the I / O (input / output) to the peripheral device 3 is not performed. Then, using the lower-level interface 7 for connecting the peripheral device 3, the exclusive control information of the access to the peripheral device 3 is transferred between the input / output processing devices 2A and 2B, and the I / O is executed after the use permission is obtained. The central processing units 1A and 1B and the input / output processing units 2A and 2A
B and the peripheral device 3 constitute a main part thereof.

The input / output processing units 2A and 2B are connected to the central processing units 1A and 1B, respectively.
0A and 10B, and connected to the peripheral device 3 by the lower interface 7.

The input / output processing devices 2A and 2B are identifiers (hereinafter abbreviated as host IDs) indicating central processing units transferred from the central processing units 1A and 1B, and identifiers (hereinafter referred to as device IDs) indicating peripheral devices. , A device ID selecting unit 202 for selecting a device ID among host IDs and device IDs, a host ID selecting unit 203 for selecting a host ID among host IDs and device IDs, An ID storage unit 205 for storing a host ID for each device ID of the peripheral device 3;
ID storage unit 205 corresponding to the device ID selected in 02
A host ID updating unit 204 that updates the host ID of the host with the host ID selected by the host ID selecting unit 203, a host ID referencing unit 206 that refers to the host ID stored in the ID storage unit 205, and a host ID referencing unit. A host ID calculating unit 207 for calculating the host ID referred to by 206 and the host ID selected by the host ID selecting unit 203; an ID transmitting unit 208 for transmitting the host ID and the device ID to the lower interface 7 according to the calculation result; A non-permission report unit 209 that reports non-permission to the central processing units 1A and 1B according to the calculation result, and a permission report unit 211 that reports permission to the central processing units 1A and 1B after updating the host ID.
The update receiving unit 210 that receives the update report from the lower interface 7, the lower ID receiving unit 212 that receives the host ID and the device ID transferred from the lower interface 7, and the host ID of the ID storage unit 205 are updated. Update report unit 21 for reporting the fact to lower interface 7
3 is included. Although the internal structure of the input / output processing device 2B is not shown in FIG. 1, it has the same configuration as the input / output processing device 2A.

FIG. 2 is a block diagram selectively showing components required for each of the input / output processing devices 2A and 2B for explaining the operation of the input / output processing system according to the first embodiment.

FIG. 3 is a diagram showing an operation flow in the input / output processing system according to the first embodiment.

Next, the operation of the thus configured input / output processing system according to the present embodiment will be described in detail with reference to FIGS. 1, 2 and 3.

First, when accessing the peripheral device 3, the central processing unit 1A transmits a host ID and a device ID to the input / output processing unit 2A in advance (step S10).
1). The host ID includes a host ID indicating the central processing unit 1A, and the device ID includes a device ID indicating the peripheral device 3 to be accessed. As an example, assume that the host ID is 01, the device ID is 03, and the host ID (00) is stored in the ID storage unit 205 corresponding to the device ID (03) (the host ID (00) Indicates an initial state, not an actual host ID.)

In the input / output processing device 2A, the transmitted host ID and device ID are received by the upper ID receiver 201 (step S102), and the device ID selector 202 receives the device ID (device ID) received by the upper ID receiver 201 (step S102). 03 in the example)
Is selected, and the host ID selection unit 203
The host ID (01 in the example) received at 01 is selected.

The host ID updating unit 204 uses the host ID from the host ID selecting unit 203 to
The host ID in the ID storage unit 205 corresponding to the device ID selected in step 2 is updated, but the actual update is not performed until the signal from the host ID calculation unit 207 becomes active.

On the other hand, in the ID storage unit 205, the host ID (currently 00) stored corresponding to the device ID (03 in the example) selected by the device ID selection unit 202 is selected (step S103). ).

The host ID reference section 206 stores the ID storage section 2
The host ID (currently 00) selected at 05 is referred to (step S104).

The host ID calculation section 207 stores the host ID (currently 00) referred to by the host ID reference section 206 and the host ID (currently 0) selected by the host ID selection section 203.
1) is calculated based on a certain rule (step S10).
5). In the example, the values of the host IDs are multiplied. In this example, the result of the operation is 00 and the host ID
The output from the operation unit 207 becomes active.

Since the output from the host ID calculation unit 207 has become active (Yes in step S106), the host ID update unit 204 stores the ID in the ID storage unit 205 corresponding to the device ID selected by the device ID selection unit 202. Host I
D is updated to the host ID selected by the host ID selection unit 203 (step S107). As a result, the host ID of the ID storage unit 205 corresponding to the device ID selected by the device ID selection unit 202 is updated from 00 to 01.

Since the output from the host ID calculation unit 207 has become active, the lower ID transmission unit 208
The host ID and the device ID received by the upper ID receiving unit 201 are transferred to the lower ID receiving unit 212 of the input / output processing device 2B (Step S108).

In the other input / output processing device 2B, the transferred host ID and device ID are received by the lower ID receiver 212 (step S109), and the device ID selector 202 receives the device received by the lower ID receiver 212. Select ID,
The host ID selector 203 selects the host ID received by the lower ID receiver 212 (Step S110).

The host ID updating unit 204 stores the ID in the ID storage unit 2 corresponding to the device ID selected by the device ID selecting unit 202.
The host ID 05 is updated to the host ID selected by the host ID selection unit 203 (step S111). As a result, the host ID of the ID storage unit 205 corresponding to the device ID selected by the device ID selection unit 202 is updated from 00 to 01.

The update report unit 213 is a host ID update unit 2
04 becomes active, it is known that the host ID of the ID storage unit 205 has been updated.
It reports that the host ID of the D storage unit 205 has been updated (step S112).

In the input / output processing device 2A, the update report reported from the input / output processing device 2B is received by the update receiving section 210 (step S113), and the permission report section 211 sends the device I
The use permission of the peripheral device 3 having D (03) is reported to the central processing unit 1A through the upper interface 10A (step S114).

The central processing unit 1A has a device ID (currently 0
3) Permission to use peripheral device 3 is obtained (step S11).
5), issue an I / O to the peripheral device 3 (step S)
116).

Upon receiving the I / O (step S117), the input / output processing device 2A transmits the I / O to the peripheral device 3 through the lower interface 7 (step S118), and accesses the peripheral device 3 (step S119). Then, when the I / O to the peripheral device 3 is completed, the input / output processing device 2A notifies the central processing device 1A of the I / O completion (step S120).

The central processing unit 1A is provided with an I / O
When the completion is received (step S121), the host I stored in the ID storage unit 205 is notified to the input / output processing device 2A.
To reset D, reset host ID (0
0) and the device ID (03) are transmitted (step S1).
22).

The input / output processing device 2A receives the reset host ID and device ID (step S10).
2) The device ID selection unit 202 selects the device ID (03 in the example) received by the upper ID reception unit 201, and
The D selecting unit 203 selects the reset host ID (00 in the example) received by the upper ID receiving unit 201 (step S103).

In the ID storage unit 205, the device ID selection unit 2
The host ID (now 01) stored corresponding to the device ID (03 in the example) selected at 02 is selected (step S103).

The host ID reference section 206 stores the ID storage section 2
The host ID (currently 01) selected at step 05 is referred to (step S104).

The host ID calculation unit 207 stores the host ID (now 01) referred to by the host ID reference unit 206 and the reset host I selected by the host ID selection unit 203.
D (00) is multiplied, and the operation result becomes 00 (step S105).

Since the operation result is 00 (step S106)
Yes), the host ID updating unit 204 stores the ID in the ID storage unit 2 corresponding to the device ID selected by the device ID selecting unit 202.
05 is updated to the host ID (00) selected by the host ID selection unit 203 (step S10).
7).

Since the operation result is 00, the host ID (00) and the device ID (03) are transferred to the input / output processing device 2B through the lower interface 7 (step S108).

The input / output processing device 2B updates the host ID of the ID storage unit 205 to 00 by the same operation as the input / output processing device 2A (steps S109 to S111). After the update, the update report unit 213 reports an update completion to the input / output processing device 2A via the lower interface 7 (step S112).

In the input / output processing unit 2A, the update completion report transferred from the input / output processing unit 2B is received by the update receiving unit 210 (step S113), and the permission report unit 211 sends the host to the central processing unit 1A through the upper interface 10A. The update completion of the ID is reported (step S114).

The central processing unit 1A receives the update completion report (step S123).

As an example, a case where the central processing unit 1A attempts to access the same peripheral device 3 while the central processing unit 1B is accessing the peripheral device 3 will be described. In this case, the host ID stored in the ID storage unit 205 corresponding to the device ID 03 is 02, and the host ID (01) and the device ID (03) are transferred from the central processing unit 1A.

The central processing unit 1A includes an input / output processing unit 2A
The host ID (01) and the device ID (03) are transmitted to the server (step S101).

In the input / output processing device 2A, the transmitted host ID and device ID are received by the upper ID receiving unit 201 (step S102), and the device ID (03) is selected by the device ID selecting unit 202, and the host ID selection is performed. The unit 203 selects the host ID (01).

In the ID storage unit 205, the device ID selection unit 2
The host ID (02) stored corresponding to the device ID (03) selected in 02 has been selected (step S103), and the host ID reference unit 206 refers to this host ID (02) (step S103). Step S104).

The host ID calculation unit 207 stores the host ID (02) referenced by the host ID reference unit 206 and the host ID
The host ID (01) selected by the D selection unit 203 is multiplied (step S105). The calculation result is 02. As a result, the output from the host ID calculation unit 207 does not become active (No in step S106), the host ID stored in the ID storage unit 205 is not updated by the host ID update unit 204, and the non-permission report unit 209 is not updated.
Reports the non-permission of the peripheral device 3 with the device ID (03) to the central processing unit 1A (step S124).

When the central processing unit 1A receives the use-disapproval report of the peripheral device 3 having the device ID (03) (step S125), it stops issuing I / O to the peripheral device 3 (step S126).

As described above, the central processing units 1A and 1B
Can obtain an exclusive control function when the common peripheral device 3 is accessed via the input / output processing devices 2A and 2B.
The peripheral device 3 does not need to have the exclusive control function conventionally performed.

FIG. 4 is a block diagram showing the configuration of the input / output processing system according to the second embodiment of the present invention. In the input / output processing system according to the present embodiment, the central processing units 1A and 1B and the input / output processing units 2A ′ and 2A
B ′, the peripheral device 3 and the exclusive control device 4 constitute the main part thereof. I / O processing devices 2A 'and 2
B ′ is connected to the central processing units 1A and 1B via upper interfaces 10A and 10B, respectively, and connected to the peripheral device 3 via a lower interface 7. Also,
An exclusive control device 4 is connected to the lower interface 7 and performs exclusive control when the central processing units 1A and 1B use the peripheral device 3.

The input / output processing units 2A ′ and 2B ′ include a host ID receiving unit 220 that receives the host ID and device ID transferred from the central processing units 1A and 1B, and a host ID and A lower ID transmitting unit 221 for transmitting the device ID, and a report receiving unit 2 for receiving a report transferred from the lower interface 7
22 and a report transmission unit 223 that transmits the received report to the central processing units 1A and 1B. FIG.
Although the internal structure of the input / output processing device 2B 'is not shown, the input / output processing device 2B' has the same configuration as the input / output processing device 2A '.

The exclusive control device 4 includes a lower interface 7
ID receiving unit 401 for receiving the host ID and the device ID transferred from the input / output processing devices 2A 'and 2B' through the host ID and the device ID among the host ID and the device ID
, An ID storage unit 405 that stores a host ID for each device ID of the peripheral device 3, a device ID selection unit 403 that selects a host ID among the host ID and device ID, The host I of the ID storage unit 405 corresponding to the device ID selected by the ID selection unit 402
A host ID updating unit 404 for updating D to the host ID selected by the host ID selecting unit 403, and an ID storage unit 405
And a host ID referred to by the host ID reference unit 406 and a host ID selected by the host ID selection unit 403.
D, a non-permission report unit 408 for reporting the non-permission of the peripheral device 3 to the lower interface 7 according to the calculation result, and a lower-level interface 7 after updating the host ID. And a permission report unit 409 for reporting the use permission of the peripheral device 3.

FIG. 5 is a diagram showing an operation flow in the input / output processing system according to the second embodiment.

Next, the operation of the input / output processing system according to the present embodiment thus configured will be described with reference to FIGS.

First, in the central processing unit 1A, the peripheral devices 3
Is transmitted to the input / output processing device 2A 'in advance (step S
201). The host ID is the ID of the central processing unit 1A.
(01), and the device ID contains the device ID (03) of the peripheral device 3 to be accessed. It is also assumed that the host ID (00) is stored in the ID storage unit 405 corresponding to the device ID (O3).

In the input / output processing device 2 A ′, the transmitted host ID and device ID are received by the upper ID receiving section 220 (Step S 202), and the lower ID transmitting section 221 sends the exclusive ID to the exclusive control device 4 through the lower interface 7. The received host ID and device ID are transferred (step S203).

In the exclusive control unit 4, the transferred host I
D and the device ID are received by the lower ID receiving unit 401 (step S204), the device ID selecting unit 402 selects the device ID (03 in the example) received by the lower ID receiving unit 401, and the host ID selecting unit 403 outputs The host ID (01 in the example) received by the lower ID receiving unit 401 is selected.

The host ID updating unit 404 uses the host ID from the host ID selecting unit 403 to
The host ID in the ID storage unit 405 corresponding to the device ID selected in step 2 is updated, but the actual update is not performed until the signal from the host ID calculation unit 407 becomes active.

On the other hand, in the ID storage unit 405, the host ID (now 00) stored corresponding to the device ID (03) selected by the device ID selection unit 402 is selected (step S205).

The host ID reference unit 406 stores the ID storage unit 4
Reference is made to the currently selected host ID 05 (currently 00) (step S206).

The host ID calculation unit 407 calculates the host ID (now 00) referred to by the host ID reference unit 406 and the host ID (now 01) selected by the host selection unit 403 based on a certain rule. (Step S207).
In the example, the values of the host IDs are multiplied. In this example, the result of the operation becomes 00, and the output from the host ID operation unit 407 becomes active.

Since the output from the host ID calculating section 407 has become active (Yes in step S208), the host ID updating section 404 stores the ID in the ID storage section 405 corresponding to the device ID selected by the device ID selecting section 402. Host I
D is updated to the host ID selected by the host ID selection unit 403 (step S209). As a result, the host ID of the ID storage unit 405 corresponding to the device ID selected by the device ID selection unit 402 is updated from 00 to 01.

The permission report section 409 is provided by the host ID update section 4
04 has become active (step S
(Yes at 208), and reports the use permission report of the peripheral device 3 to the input / output processing device 2A 'through the lower interface 7 (step S210).

In the input / output processing unit 2 A ′, the use permission report of the peripheral device 3 from the exclusive control unit 4 is sent to the report receiving unit 222.
(Step S211), and the report transmitting unit 223 transmits the use permission report of the peripheral device 3 to the upper interface 10A.
Is transferred to the central processing unit 1A (step S212).

The central processing unit 1A receives the permission to use the device ID (03) for the peripheral device 3 (Step S).
213), an I / O is issued to the peripheral device 3 (step S214).

Upon receiving the I / O (step S215), the input / output processing device 2A 'transmits the I / O to the peripheral device 3 via the lower interface 7 (step S216), and accesses the peripheral device 3 (step S217). Then, when the I / O to the peripheral device 3 is completed, the input / output processing device 2A 'notifies the central processing device 1A of the I / O completion (step S218).

When the I / O to the peripheral device 3 is completed (step S219), the central processing unit 1A resets the host ID stored in the ID storage unit 405 to the input / output processing unit 2A '. Host ID for
(00) and the device ID (03) are transmitted (step S220).

In the input / output processing device 2A ', after the reset host ID (00) and the device ID (03) are transferred, the upper ID receiving section 220 and the lower ID transmitting section 22
1 is transferred to the exclusive control device 4 via the lower interface 7 (steps S202 and S203).

In the exclusive control unit 4, the transferred reset host ID (00) and device ID (03) are received by the lower ID receiving unit 401 (step S204).

In the ID storage unit 405, the device ID selection unit 4
The host ID (01) stored corresponding to the device ID (03) selected in 02 is selected (step S205).

The host ID reference unit 406 stores the ID storage unit 4
Reference is made to the currently selected host ID (01) of step 05 (step S206).

The host ID calculation unit 407 stores the host ID (01) referenced by the host ID reference unit 406 and the host ID
Multiplying by the host ID (00) selected by the selection unit 403 results in 00 (step S207).

Since the operation result is 00 (step S208)
Yes), the host ID updating unit 404
05 is updated to 00 (step S20)
9). After the update, the permission report unit 409 reports to the input / output processing device 2A 'through the lower interface 7 (step S210).

In the input / output processing device 2A ', the report receiving unit 2
22, the update is received, and the report transmission unit 223 reports the update of the host ID to the central processing unit 1A.

According to this report, the central processing unit 1A
It recognizes that the host ID of the D storage unit 405 has been reset (step S221).

As an example, a case where the central processing unit 1A attempts to access the same peripheral device 3 while the central processing unit 1B is accessing the peripheral device 3 will be described. This is a case where the host ID of the ID storage unit 405 corresponding to the device ID (03) is 02.

The central processing unit 1A includes an input / output processing unit 2A
Then, the host ID (01) and the device ID (03) are transferred (step S201).

In the input / output processing device 2A ′, the host ID and the device ID are received by the upper ID receiving section 220 (step S202), and the host ID received from the lower ID transmitting section 221 to the exclusive control device 4 through the lower interface 7 is received. ID and device ID are transferred (step S20)
3).

In the exclusive control unit 4, the input / output processing unit 2
The host ID and device ID transferred from A ′ are lower I
The device ID is received by the D receiving unit 401 (step S204), the device ID is selected by the device ID selecting unit 402, and the host ID is selected by the host ID selecting unit 403 (step S20).
5).

In the ID storage unit 405, the device ID selection unit 4
The host ID (02) of the ID storage unit 405 corresponding to the device ID (03) selected in 02 is selected, and the host ID (02) stored in the ID storage unit 405 by the host ID reference unit 406 is selected. Referenced (Step S2
06).

The host ID calculation unit 407 stores the host ID (02) referenced by the host ID reference unit 406 and the host ID
The host ID (01) selected by the D selection unit 403 is multiplied (step S207). The calculation result is 02.

As a result, the output from the host ID calculation unit 407 is not activated (No in step S208), and the host ID update unit 404 does not update the host ID stored in the ID storage unit 405, Permission report section 4
08 is provided to the input / output processing device 2A '
The use permission of the peripheral device 3 of the device ID (03) is reported through the process (step S222).

In the input / output processing device 2A ', the report of non-permission is received by the report receiving section 222 (step S22).
3), transferred from the report transmission unit 223 to the central processing unit 1A (step S224).

When the central processing unit 1A receives the use-disapproval report (step S225), the use permission of the peripheral device 3 having the device ID (03) is not obtained. The issuing is stopped (step S226).

As described above, since the exclusive control device 4 has the exclusive control function when accessing the common peripheral device 3, the peripheral device 3 does not need to have the exclusive control function conventionally performed.

[0098]

The first effect is that when two or more input / output processing devices are used in an input / output processing system, a peripheral device having no exclusive control function can be connected as a common peripheral device. This means that it is possible to connect a low-priced SCSI device that is widely used. The reason is that when two or more input / output processing devices are used, an exclusive control function for controlling a common peripheral device is incorporated in the input / output processing device or an exclusive control function connected to an interface to the peripheral device. This is because the device is provided.

The second effect is that the exclusive control information between the input / output processing devices or the exclusive control information between the input / output processing device and the exclusive control device does not require a dedicated interface. Thus, the number of signal lines between the input / output processing devices and between the input / output processing device and the exclusive control device can be reduced, and the circuit configuration can be simplified. The reason is that the exclusive control information is transferred using an interface (such as SCSI) for connecting peripheral devices.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an input / output processing system according to a first embodiment of the present invention.

FIG. 2 is a block diagram for explaining an operation of the input / output processing system according to the first embodiment.

FIG. 3 is a diagram showing an operation flow in the input / output processing system according to the first embodiment.

FIG. 4 is a block diagram illustrating a configuration of an input / output processing system according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an operation flow in the input / output processing system according to the second embodiment.

FIG. 6 is a block diagram illustrating an example of a conventional input / output processing system.

[Explanation of symbols]

 1A, 1B Central processing unit 2A, 2B, 2A ', 2B' I / O processing unit 3 Peripheral device 4 Exclusive control unit 7 Lower interface 10A, 10B Upper interface 201, 220 Upper ID receiving unit 202, 402 Device ID selecting unit 203, 403 Host ID selection unit 204, 404 Host ID update unit 205, 405 ID storage unit 206, 406 Host ID reference unit 207, 407 Host ID calculation unit 208, 221 Lower ID transmission unit 209, 408 Non-permission report unit 210 Update reception unit 211, 409 Permission report unit 212, 401 Lower ID reception unit 213 Update report unit 222 Report reception unit 223 Report transmission unit

Claims (4)

[Claims] An input / output processing device connected to a higher-level device via a higher-level interface and connected to a peripheral device via a lower-level interface, wherein, for each peripheral device ID of the peripheral device, a higher-level device ID of the higher-level device using the peripheral device. ID storing means for storing the upper device ID and the higher device ID for receiving the higher device ID and the lower device ID transferred from the higher device before accessing the lower device.
Receiving means; high-order ID selecting means for selecting a high-order device ID received by the high-order ID receiving means; device ID selecting means for selecting a peripheral device ID received by the high-order ID receiving means; ID reference means for reading a higher-level device ID stored in the ID storage means corresponding to the peripheral device ID selected by the means; and a higher-level device ID read by the ID reference means and a selection by the higher-level ID selection means. ID operation means for performing an operation from the selected higher-level device ID, and a higher-order device stored in the ID storage means corresponding to the peripheral device ID selected by the device ID selection means in accordance with the calculation result of the ID operation means. ID updating means for updating the device ID to the higher-level device ID selected by the higher-level ID selecting means; Lower-level ID transmitting means for transmitting a higher-level device ID and a peripheral device ID, lower-level reporting means for reporting to a higher-level device a non-permission of use of a peripheral device according to the calculation result of the ID calculating means, Lower-level ID receiving means for receiving the transferred higher-level device ID and peripheral device ID; update reporting means for reporting to the lower-level interface that the higher-level device ID stored in the ID storage means has been updated; Update receiving means for receiving an update report; and permission report means for reporting permission of use of a peripheral device to a higher-level device in accordance with outputs from the update receiving means and the ID updating means. Output processing device. 2. An input / output processing device connected to a higher-level device via a higher-level interface and connected to a peripheral device via a lower-level interface, wherein a higher-level device ID and a peripheral device ID are transferred from the higher-level device before accessing the peripheral device. Top ID to receive
Receiving means, and a lower ID for transmitting the upper device ID and the peripheral device ID received by the upper ID receiving means to the lower interface
An input / output processing apparatus comprising: a transmitting unit; a report receiving unit that receives a report from a lower interface; and a report transmitting unit that transmits a report received by the report receiving unit to a higher-level device. 3. An exclusive control device connected to a lower interface to which two or more input / output processing devices and peripheral devices are connected, wherein a higher-level device that uses a peripheral device for each peripheral device ID of the peripheral device. ID storage means for storing a device ID; lower ID receiving means for receiving a higher device ID and a peripheral device ID transferred from a lower interface; higher ID selection for selecting a higher device ID received by the lower ID receiving means Means, a device ID selecting means for selecting a peripheral device ID received by the lower ID receiving means, and a higher order device stored in the ID storage means corresponding to the peripheral device ID selected by the device ID selecting means. ID reference means for reading an ID, and a higher-level device ID read by the ID reference means and a higher-level device ID selected by the higher-level ID selection means An ID calculating means for performing a calculation; and a higher-level device ID stored in the ID storage means corresponding to the peripheral device ID selected by the device ID selecting means in accordance with a calculation result of the ID calculating means. ID updating means for updating to a higher-level device ID selected by the selection means, non-permission reporting means for reporting a non-permission of a peripheral device to a lower-level interface according to a calculation result of the ID calculating means, and ID storage And a permission reporting unit for reporting to the lower interface that the upper device ID stored in the means has been updated, as a permission to use the peripheral device. 4. An input / output processing system having an input / output processing device connected to a higher-level device via a higher-level interface, connected to a peripheral device via a lower-level interface, and an exclusive control device connected to the lower-level interface, A higher-level ID receiving means for receiving a higher-level device ID and a peripheral device ID transferred from a higher-level device before the processing device accesses the peripheral device, and a higher-level device ID and a higher-level device ID received by the higher-level ID receiving means Lower-level ID transmitting means for transmitting the report to the lower-level interface, report receiving means for receiving a report from the lower-level interface, and report transmitting means for transmitting the report received by the report receiving means to a higher-level device, The exclusive control device stores, for each peripheral device ID of the peripheral device, an upper device ID of a higher device using the peripheral device. An ID storage unit that, the lower ID receiving means for receiving the higher-level device ID and the peripheral device ID is transferred from the lower interface, host device I received on the lower ID receiving means
D, an upper device ID selecting device, a device ID selecting device for selecting a peripheral device ID received by the lower ID receiving device, and a peripheral device ID selected by the device ID selecting device.
Upper device ID stored in the ID storage means corresponding to
ID reference means for reading the ID, ID calculation means for performing an operation from the upper device ID read by the ID reference means and the upper device ID selected by the upper ID selection means,
The upper device ID stored in the ID storage device corresponding to the peripheral device ID selected by the device ID selecting device in accordance with the calculation result of the D calculating device is the higher device ID selected by the higher ID selecting device. ID updating means for updating to the lower-level interface, non-permission reporting means for reporting the non-permission of the peripheral device to the lower interface in accordance with the calculation result of the ID calculating means, and upper-level device ID stored in the ID storage means. An input / output processing system having permission reporting means for reporting the update to the lower interface as a permission to use the peripheral device.