JPH02207362A - Channel control system - Google Patents

Abstract

PURPOSE:To change the operating mode of individual channel without affecting on another channel by setting the operating mode of a specific channel by a channel system based on the number information and the mode information of the channel of a specific instruction. CONSTITUTION:A channel operating mode setting instruction (1) is provided as the specific instruction to change the operating mode of the channel 22. The channel operating mode setting instruction (1) is provided with a first operand to instruct a channel address (channel number) and a second operand to instruct the operating mode of the channel. The channel system 2 sets the channel operating mode instructed by the second operand selectively on the channel operating mode bit of a channel control table 220 in the channel 22 for the channel 22 instructed by the first operand, and changes the operating mode of the channel 22. Thereby, it is possible to change the operating mode of each channel without affecting on another channel.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a channel control method in a computer system having a channel system composed of a plurality of channels (CI), and particularly to a method for setting the operation mode of each channel (C11). The purpose is to change the operating mode of an individual channel (C11) without affecting other channels (CI), and the channel (C11) is added to the instructions executed by the central processing unit (CPU).
For setting the operation mode of each channel (CH),
A specific command (2) consisting of number information (CH) and mode information is provided, and the above-mentioned channel (CI+) of the specific command (2) is
Based on the number information and mode information of the channel system, the channel system sets the operation mode of a specific channel (CI), or each channel (CH
) is configured to set the operating mode of its own channel (CI+).

[Industrial application field]

The present invention relates to a channel control method in a computer system having a channel system composed of a plurality of channels (CI+), and particularly to a method for setting the operation mode of each channel (CI+).

With the recent increase in size and performance of computer systems, 1
The construction of virtual computer systems in which a plurality of calculations a (virtual computers) are run on one physical computer system is becoming popular.

In addition, as the reliability of computer systems has recently improved, there has been a trend toward online systems, and in these virtual computer systems, virtual computers that perform batch processing and virtual computers that operate online often coexist. Furthermore, the number of virtual machines operating online is also on the rise.

Therefore, in such a virtual machine system, when it is desired to change the configuration of the input/output device of a certain virtual machine, a configuration control method is required that does not affect other virtual machines operating online.

[Prior art and problems to be solved by the invention] FIG. 3 is a diagram illustrating a conventional channel control system.

The computer system shown in this figure has a channel system 2 that is composed of a plurality of channels (CI+) 22 and a channel general control unit (CAC) 21 that controls the channels (CI+) 22 in an integrated manner.

When the computer system functions as a virtual computer system, a plurality of The guest programs 31a to 31a corresponding to the virtual machines are executed in a time-sharing manner.

In such a virtual computer system, the central processing unit 1l (CPU) l runs a specific guest program 318.
By executing the input/output command in ~, the channel general control unit (CAC) 21 decodes the input/output command and instructs the channel (CH) 22 specified by the input/output command to perform input/output processing. It functions as follows.

Each hand Janel (CH) 22 operation mode is selector mode, by the method of multiple operation of input/output processing.

There are operating modes such as block multiplex mode and byte multiplex mode.

In the conventional virtual computer system as described above, the channel (C8) 22 that constitutes the channel system 2
When changing the operation mode of one or more channels (CI+) 22, the service processor (S
After changing the input/output device configuration information (channel operation mode, etc.) stored in a specific area of the file storage device 41 of VP) 4, the operator executes the guest program of each virtual machine from the console 42.42a. After stopping the running of 31a, a reset key for the entire virtual computer system called general reset or power-on reset is pressed.

Then, the central processing unit (CPU) 1. Main memory (M
S) A reset operation is performed on each device such as the concubine and channel system stand, and the channel operation mode is set for the corresponding channel (CI() 22) from the file storage device 41 connected to the service processor (SVP) 4. will be held.

If such a reset operation is performed for the entire virtual computer system, the operating systems (O3) of all the guest programs 31a to 31a running on the virtual computer system cannot continue to operate, so after the reset is completed, The operator instructs the central processing unit (CPU) 1 to reload (rPL) the operating system (O3) of all the guest programs 31a to 31a that were operating before the start of the reset.

Based on the instruction, the central processing unit (CPIJ) 1 selects the channels (where the configuration of the input/output bag W (Ilo) has not been changed).
C11) File storage device 5b connected to 22
Reload the operating system (O3) from (I
PL) I was doing it.

Therefore, in the conventional computer system, even when changing the operation mode of one or more channels (C11) 22 of the channels (C1) 22 constituting the channel system 2, the computer system The operation of the entire system must be stopped, and the channel (C11) 2
The problem with changing the operation mode of No. 2 is that it affects other channels (CI) 22 that are not directly related.

In particular, if the computer system is a virtual computer system as described above, and a virtual computer using the channel (C11) 22 that is not related to the change in the operation mode is operating online, the online operation The problem was that it affected the

In view of the above-mentioned conventional drawbacks, the present invention provides a plurality of channels (C
1+) in a computer system having a channel system, in particular changing the operation mode of each channel (CIl).

It is an object of the present invention to provide a channel control method that can change the operation mode of an individual channel (CH) without affecting other channels (CH) when setting the channel.

[Means to solve the problem]

FIG. 1 is a diagram explaining the principle of the channel control system of the present invention, in which (a) shows an example of the configuration, and (b) shows an example of the format of a channel operation mode setting command.

The above problems are solved by a channel control method configured as follows.

In a computer system having a channel system 2 consisting of a plurality of channels (C1l) 22, instructions executed by a central processing unit (CPU) l are
A specific command consisting of number information and mode information of each channel (CH) 22 is provided to set the operation mode of the channel (CIl) 22 of the specific command (2). Based on the number information and mode information, the channel system 2 sets the operation mode of a specific channel (CH) 22, or each channel (CH) in the channel system 2
CJI) 22 is configured to set the operating mode of its own channel (CIl) 22.

[Effect]

That is, according to the present invention, in a computer system having a channel system composed of a plurality of channels (CH), the configuration of an input/output device connected to a certain channel (CH) is changed, and the configuration of the input/output device connected to a certain channel (CH) is changed. In order to change the operation mode of the channel (CIl) in accordance with the operation of the input/output device, a channel operation mode setting command (2) is provided as a specific command for changing the operation mode of the channel (CI1).

The channel operation mode setting command (2) has a first operand that specifies a channel address (channel number) and a second operand that specifies the channel operation mode, as shown in FIG. For example, 1. When the specific channel operation mode setting command (■) is executed in the virtual machine system monitor program, the first and second operands are set to the central processing unit (
CPU) to the channel system, and the channel system receives the channel (CIl) indicated by the first operand.
), selectively sets the channel operation mode indicated by the second operand in the channel operation mode pit of the channel control table (CREG) in the channel (C1l), and Change operating mode.

If there are multiple channels (C11) whose operation modes are to be changed, the operation modes of the multiple channels (CI) can be changed by executing the channel mode setting command (■) multiple times. can.

Since it works in this way, other parts of the computer system,
In other words, without affecting other channels (CH),
The operating mode of each channel (CH) can be changed, and even when changing the input/output configuration dynamically, there is no need to stop the entire computer system, which greatly contributes to the flexibility of the input/output configuration. There is.

〔Example〕

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

The above-mentioned FIG. 1 is an explanatory diagram of the principle of the channel control method of the present invention, and FIG. 2 is a diagram showing an embodiment of the present invention, and shows the channel operation mode executed by the central processing unit (CPU) 1. Means for changing the operation mode of the channel (C11) 22 designated by the setting command (2) is necessary for carrying out the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

Hereinafter, with reference to FIG. 1 and FIG. 2, the channel control method of the present invention, particularly the operation mode changing method for the channel (CI+), will be explained.

Also in this embodiment, for convenience of explanation, a plurality of virtual computers, that is, guest programs (
Hereinafter, we will discuss a virtual computer system in which 31a (hereinafter referred to as virtual computers) run.

Even if the present invention is implemented, the input/output processing operation for the channel (CI) 22 will not change in particular, so it will be omitted here. Change the connected input/output device 5a and change the channel (C)I) 22
The case where the operation mode of a is changed will be explained as an example.

First, the system monitor program (system monitor) 30 of the virtual computer system directly or instructs the virtual computer 31a to issue a reset channel command to the channel (C1l) 22a under the virtual computer 31a. Alternatively, a channel offline command is issued to instruct the channel (CI) 22a to go offline, and at the same time, the operator is informed via the display (CRT) 42 of the service processor (SVP) 4 that the channel (CI 22a) is offline. Was it.

Then, the new input/output configuration etc. for the offline channel (CH) 22a are notified.

The operator recognizes the notification and selects the channel (C8).
After changing the input/output device configuration connected to 22a to the notified configuration, the service processor (SVP
) The virtual machine system monitor program 30 is notified through the keyboard (KB) 42a of No. 4 that the change of the input/output device has been completed.

Here, for example, the virtual computer system monitor 30
A channel operation mode setting command (see FIG. 1(b)) of the present invention is issued to the channel system 2.

For example, the channel integrated control unit (CAC) 21 of the channel system 2 issues the channel operation mode setting command
is decoded and the channel control table (CR
EG) Set the channel operation mode specified by the second operand of the instruction (2) in the channel operation mode pit of 220.

Subsequently, the virtual machine system monitor (system monitor) 30 brings the channel (C1l) 22a online with a specific command, and runs the operating system (O8) corresponding to the virtual machine 31a according to the new input/output configuration information. For example, reload from the file storage device 5b or the like connected to another channel (CI) 22b connected to the channel (CH) 22a.

In the above embodiment, a specific channel operation mode setting command issued by the virtual machine system monitor program (system monitor) 30 is sent to the channel system 2.
The explanation has been given using an example in which the channel control table (CREG) 220 of the channel (C11) 22 is decoded by the channel general control unit (CAC) 21 of the instruction Broadcast to all channels (C8) 22 that make up the system 2, each channel (C11) 22 identifies whether or not the change instruction is directed to itself, and the channel recognized as the change instruction directed to itself. (C11) 22
only own channel control table (CRI!G)
) 220 may be changed.

As described above, in a computer system having a channel system composed of a plurality of channels (CI+), the present invention changes the input/output device configuration of a specific channel (CI) to improve the operation of the channel (CI). To change Moto to an operation mode that matches the new input/output device configuration, a specific channel operation mode setting command ■ is provided, and the command ■
Channel control table (CH) of the channel (CH) specified by
By setting the channel operation mode specified by the command (CRIEG) only, the operation mode of the channel (CI) can be dynamically changed without affecting other channels (CH) of the computer system. The feature is that it can be changed.

〔Effect of the invention〕

As explained above in detail, the channel control method of the present invention changes the operation mode of each channel (CI) in a computer system having a channel system consisting of a plurality of channels (CI+). For setting the operation mode of the channel (C1+) in the instruction executed by the central processing unit ff (CPLI) of the computer system,
Number information of each channel (CH) mentioned above.

A specific command (2) consisting of mode information and number information of the channel (C11) of the specific command (2) is provided.

Based on the mode information, the channel system sets the operating mode of a specific channel (CH), or each channel (CH) within the channel system sets the operating mode of its own channel (CI(')). Since the setting is made so that the operation mode of each channel (C11) can be changed without affecting other parts of the computer system, that is, other channels (CH), it is possible to dynamically change the operation mode of each channel (C11). Even when changing the input/output configuration, there is no need to stop the entire computer system, which greatly contributes to the flexibility of the input/output configuration.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the channel control method of the present invention. FIG. 2 is a diagram showing an embodiment of the present invention. FIG. 3 is a diagram explaining a conventional channel control method. It is. In the drawing, ① is the central processing unit ff (CPU), and 2 is the channel system. 21 is a channel general control unit (CAC). 22.22a, 22b ~ are channels (CH). 220 is the channel! II? Wholesale table (CREG)
. 3 is the main memory (MS). 30 is a virtual computer system monitor program (system monitor). 31a~ are guest programs or virtual machines. 4 is a service processor (SVP), 41 is a file storage device, and 42 is a display (CRT).
). 42a is the keyboard (KB). ■ is a channel operation mode setting command. are shown respectively. Channel operation mode pit (b) Diagram explaining the principle of the channel control method of the present invention FIG. 1 KB Diagram explaining the conventional channel control method

Claims (1)

[Claims] In a computer system having a channel system (2) consisting of a plurality of channels (22), an instruction executed by a central processing unit (CPU) (1) includes a channel (2).
Each channel (2) above is used to set the operation mode of (2).
2) A specific command consisting of number information and mode information (
[1]), and the channel system (2) determines the operation mode of the specific channel (22) based on the number information and mode information of the channel (22) of the specific instruction ([1]). or each channel (22) in the channel system (2) sets the operating mode of its own channel (22).