JPH041845A - Adaptor access system for multiplex system - Google Patents

Abstract

PURPOSE:To confirm the normalcy of a system without affecting the adaptor used in a working system by attaining a constitution where both working and stand-by main body devices have accesses to the adaptors respectively based on the access instruction information shown by an operation mask table. CONSTITUTION:An operation mask table 120 is provided into a common bus adaptor 12 to instruct the access forms of a working system 1a and a stand-by system 1b in response to plural adaptors (#0,...) 2 connected to an adaptor common bus 3. Thus the working and stand-by main body devices 1a and 1b have accesses to the adaptors respectively based on teh access instruction information shown by the table 120. As a result, the system normalcy is confirmed without affecting the adaptor used by the system 1a when this system 1a is switched to the system 1b.

Description

[Detailed description of the invention] 〔overview] The main unit of multiple computers is the current system.

Regarding an adapter access method in a computer system that shares multiple adapters that control multiple input/output devices (Ilo) via a common bus adapter and a backup system, respectively, each To provide a method in which each system can access each adapter without disturbing each adapter by selectively being aware of which system among a plurality of active systems/standby systems an adapter is used in. The purpose is to provide access modes (writable) from each of a plurality of active systems and a standby system within the common bus adapter, corresponding to a plurality of adapters connected to the adapter common bus.

Set up an operational mask table that instructs read only).
Based on the access instruction information indicated by the operational mask table, each active/standby main device is configured to access each adapter.

[Industrial application field]

The present invention provides a system in which a plurality of main devices constituting a computer share a plurality of adapters via an adapter common bus, in which each adapter that controls an input/output device (Ilo) is connected to the main device of each main device. It relates to a method for access by a central processing unit (CCPU).

In recent years, with the onlineization of information processing systems and the trend toward improving processing capacity due to the diversification of information processing, multiplex systems have been constructed when constructing high reliability light systems such as 24-hour operation. It's here.

In this case, if the current system is forced to suspend processing due to some reason, a means to quickly take over business processing to the backup system is required, and a means to replace defective parts of the current system and It is necessary to perform maintenance without disturbing the system that is taking over the work.

Also, the backup system device is not effective for the cost and efficiency of the system if it is used solely for the purpose of backing up the current system.

Generally, it is better to use it for other purposes, even if there are some restrictions.
Depending on the frequency of switching to the standby system, overall efficiency will improve.

As the scale of the system increases, the amount of money required for the backup system becomes enormous, and it becomes necessary to use the backup system more effectively.

At this time, in order to access the adapters that are shared between the active system and the backup system, it is necessary for each system to be able to accurately recognize whether each adapter is used in the active or backup system and use it. It is said that

[Prior Art and Problems to be Solved by the Invention] FIG. 3 is a diagram illustrating a conventional adapter access method in a multiplex system.

Conventionally, when a job is handed over from the active system 1a to the standby system lb, after the switching mechanism 5 performs switching processing in response to the switching signal ■ from the system monitoring device 4,
When replacing defective parts, maintaining, tax preparation, etc. in the current system 1a, a test program is run to confirm the normality of the system.

At that time, each adapter (#0 to #
n) If adapter 2 is in use from the backup system (currently operating system), the test program
10~) When accessing 2, especially a write operation,
There was a problem that caused the adapter (#0~) 2 to malfunction.

In view of the above-mentioned conventional drawbacks, the present invention aims to eliminate the cause of malfunction of the adapter by determining on which side of the active/standby system each adapter on the adapter common bus can operate.
An operational mask table corresponding to the adapter number is set up, all tests are enabled for valid adapters, and tests that do not cause malfunction of the adapter are set for invalid adapters (
The purpose of the present invention is to provide an adapter access method that allows only state sensing (for example, status sensing, etc.) to be performed.

[Means to solve the problem]

FIG. 1 is a diagram showing the basic configuration of the present invention.

The above problems are solved by the multiplex system adapter access method configured as follows.

The main unit 1 of a plurality of computers is a current system 1a,
A standby system lb, which shares a plurality of adapters (#o~) 2 that control a plurality of input/output devices (Ilo) via a common bus adapter 12 and an adapter common bus 3, respectively. In the computer system, within the common bus adapter 12, there are a plurality of current operating systems 1a and a backup system ib corresponding to the plurality of adapters (#0~) 2 connected to the adapter common bus 3. An operational mask table 120 is provided that instructs each type of access mode (writing is possible, or only reading is possible), and based on the access instruction information indicated by the operational mask table 120, each active/spare main unit 1a is , lb configure each adapter 2 to access.

[Effect]

FIG. 1 is a diagram showing the principle configuration of the present invention.

Here, as an example of a multiplex system, an active system and a standby system in a duplex system are shown.

In a multiplex system, for example, a system monitoring device 4 monitors the entire multiplex system and has means for switching to a standby device. This instruction signal ■ is connected to the switching mechanism 5.

The switching mechanism 5 has an "A/B-it pull" signal (2) which is a notification signal to the common bus adapter 12.

Common bus adapter (#A/IB) 12 is each adapter (#0~) that controls each input/output device (Ilo) 6 from the central processing unit (CPtlltA/1FB) 10
2, for example, for a test request,
For example, all tests (specific Specifically, write/read tests)
becomes possible.

The one whose mask data corresponds to "On" is the other system (here, the standby system lb) and the adapter (RoO~) 2.
may be in use, so do not use the adapter (#0
~) 2 allows only tests that do not cause malfunctions (for example, status sensing, etc.) to be executed.

By performing such adapter access, it is possible to confirm the normality of the system without affecting the adapter used by the currently operating system.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

The above-mentioned FIG. 1 is a diagram showing the principle configuration of the present invention, and FIG. 2 is a diagram showing an embodiment of the present invention, (al), (
a2) shows a configuration example, and (b) shows an example of notification to the ^/B Itokashi signal signal common bus adapter at the time of switching, and the common bus adapter (IA) of the main unit l.

IB) 12, each adapter 2 on the adapter common bus 3
is provided with an operation mask table 120 that indicates which side of the active/backup system it is operable in, corresponding to the adapter number, and all accesses are enabled for the valid ('l') adapter 2. A means necessary to carry out the present invention is a means for accessing the invalid (“0°)” adapter 2 in a manner that does not cause malfunction of the adapter.The same reference numerals throughout the drawings indicate the same objects. It shows.

Hereinafter, referring to FIG. 1 and FIG. 2, the adapter access method in the multiplexing system of the present invention will be explained.

The system monitoring device 4 described above monitors the operational status of the entire system.

That is, the status of the main unit 1a of the current system can be known via the service processor (hereinafter referred to as SvP) 13 in each main unit 1a, lb, and the current A switching instruction is given from the system 1a to the backup system 1b.

A switching instruction signal (2) from the system monitoring device 4 is connected to the switching mechanism 5.

The switching mechanism 5 includes a bus arbiter mechanism for granting usage rights to bus requests from a plurality of adapters (110-) 2 connected to the adapter common bus 3, and a bus arbiter mechanism for granting usage rights to bus requests from a plurality of adapters (110-) 2 connected to the adapter common bus 3; The common bus adapters (IA, IB)
A notification signal "A/B-(nable") is sent to 12.

Common bus adapter (IIA/#B) 12 is a plurality of adapters (110 to #B) connected to the adapter common bus 3.
) 2 and the central processing unit (CP[I) 10,
Central processing unit (CP[J) 10 to each adapter (#O
~) Relay of instructions for startup, sense, test, etc. for 2;
It controls information transfer and interrupt request signals.

The "A/B-enable" signal (2) selects the corresponding operational mask table 120a, b.

The operational mask table 120 is configured to store data between a plurality of adapters (#0~) 2 connected to the adapter common lot 3 and a central processing unit (CP[J)
) When access is made from io to each adapter (#0~) 2, for example, a test instruction is made, the "A/B-enable full" signal ■ causes an "enable instruction" (A/B enable signal The operational mask tables 120a and 120b, each of which is set to "1"), are referenced, and if the bit that matches the test-instructed adapter number is "1",
Instructions for performing all tests (specifically, write and read tests) are sent to the common bus adapter (ljA
/IB) 12 issues a relay instruction to the corresponding adapter (IIO~) 2.

If the corresponding bit is "0" in the reference process, a relay instruction is given to perform a test that does not cause malfunction of the corresponding adapter (#0~) 2, for example, to perform only reading.

For example, as shown in (al) figure, the current system 1a
An “A-enable” instruction (“1”) is issued to the common bus adapter #A12 on the side, and a “B-enable” instruction (‘1’) is issued to the common bus adapter #B12 on the standby system lb side.
), the test from the current system 1a is based on the operation mask table (JjA) 120a, and the adapters (#0.~) 2 corresponding to the adapter numbers "0, 1.3. . . ." All test instructions are given, and instructions are given not to perform any tests on the adapter number "2..." since it is possible that it is being used in the backup system 1b.

The operational mask table (cloud A, 1IB) 120 a,
The setting b can be set in advance, for example, at the time of system startup, etc.
The common bus adapters (IA, IB) 12 are set by the system monitoring device 4, respectively.

FIG. 2(b) shows an example of an instruction using the above-mentioned "A-Enable 8/B-Enable 8" signal ■ when switching from the active system 1a to the standby system 1b in response to an instruction from the system monitoring device 4. be.

That is, during normal operation, the above-mentioned "^-enable 7B-ite pull" signal ■ of the current system 1a is 110".
Therefore, the operational mask table (IIA) of the present invention
120a and a central processing unit (CP[J IIA) 10
The comparator 121 compares the access instruction from the adapter ($10.
1.3~) 2 has free access (write,
Adapter (112) 2 corresponding to the adapter number with a bit value of “0” is recognized as possibly being used by the backup system 1b, and is limited to reading, for example. and instruct the user to access it.

Similarly, the above "A-enable 1" of the backup system 1b
/B-ite pull" signal is "0/l°, so the comparator 121 compares the operational adapter table (see B) 120b of the present invention and the access instruction from the central processing unit (CPU JIB) 10. and instructs to perform access corresponding to the bit value. In addition, in the above operational mask table 120, the adapter (110) 2 is set so that it can be accessed freely from both systems 1a and lb because the adapter (#O) 2 is set so that it can be accessed freely from both systems 1a and lb. This is because it has a mechanism that allows it.

Therefore, when accessing the adapter (#0~) 2 from the active system Ia and the standby system 1b, the adapter (#0~) 2 will not malfunction.

Next, when switching from the active system 1a to the backup system 1b, the above "A-Enable B" of the active system 1a is switched.
/B-ITPULL" signal (2) is set to "010", and the above-mentioned "^-ITPULL NO B-INAKER1" signal (2) of the backup system 1b is set to "1/1".

Therefore, from the current system 1a, any adapter (
110~) 2 is also inaccessible,
Can perform maintenance work such as replacing defective parts.

At this time, the backup system (i.e., the current operating system) l
The above “8-enable/B-enable” signal ■ of b is “°1/1”, and all adapters (10~) 2
can be freely accessed.

Once the above maintenance work is completed, the current system 1a
The above “A-enable/low enable” signal ■
is set to 110°, and the backup system (currently operating system)
lb's above "8-enable/low pull" signal■
By setting 0/l°, the active system 1a can adjust the usage status of the backup system 1b according to the usage status of the backup system 1b.
Free tests are performed on adapters (111, 3~) 2 that are not used by system 1b, and adapters (111, 3~) 2 that may be used by the backup system 1b are tested.
By reading and testing, for example, using a status sensing means, the test can be performed without affecting the currently operating system 1b.

In this way, the present invention provides main body devices of a plurality of computers,
In a computer system consisting of a current operating system and a standby system, each of which shares multiple adapters that control multiple input/output devices via a common bus adapter, each main unit For example, when starting up a system, an adapter used exclusively by a device can be changed to a common bus adapter (ltA/B).
By specifying system-compatible instructions in the operational mask table provided in , is characterized in that by selectively instructing each system, it is possible to avoid access to adapters used by other systems that may cause malfunctions such as writing.

〔Effect of the invention〕

As described above in detail, the adapter access method of the multiplexed system of the present invention is such that the main unit of a plurality of computers is composed of a current operating system and a backup system.
In a computer system that shares a plurality of adapters that each control a plurality of input/output bags f (Ilo) via a common bus adapter, the adapter common bus is connected to the adapter common bus in the common bus adapter. An operational mask table is provided that instructs the access mode (writable, read only) for each of the multiple active systems and standby systems, corresponding to the multiple adapters connected to the Based on the access instruction information indicated by This has the effect of being able to check the health of the system without affecting the installed adapter.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention. FIG. 2 is a diagram showing an embodiment of the present invention. FIG. 3 is a diagram illustrating a conventional adapter access method in a multiplex system. It is. IO is the central processing unit (CPU #A, #B). 11 is a main storage device. 12 is a common bus adapter (#A, 1B) and 13 is a service processor (SVP). 3 is the adapter common bus. 4 is a system monitoring device. 5 is a switching mechanism. ■ is a switching signal. ■ is the word A enable/B enable. are shown respectively. In the drawings, 1 is the main unit, and 1a is the current system. ib is a backup system, 2 is an adapter ($0-In)
.

Claims (1)

[Claims] A main unit (1) of a plurality of computers is connected to a current system (1).
a) and a backup system (1b), each of which connects a plurality of input/output devices (I/O) (6) via a common bus adapter (12) and an adapter common bus (3).
), in a computer system that shares a plurality of adapters (2) that control a plurality of adapters (2), the common bus adapter (12) includes a plurality of adapters (2) that are connected to the adapter common bus (3). An operational mask table (120) is provided for instructing access modes from each of the plurality of current operational systems (1a) and backup systems (1b), and access instruction information indicated by the operational mask table (120) is provided. Based on each current/spare main unit (1a, 1b)
accesses each adapter (2).