JPS5945530A - Channel controlling system - Google Patents

Abstract

PURPOSE:To switch buses dynamically at a channel level in accordance with schedules in central processors by providing a channel controlling device connected to plural data processing systems with a central processor interface part having a system discriminating element. CONSTITUTION:Plural data processing systems S1, S2 are constituted by central processors 11, 21, main storage devices 12, 22, main storage controlling devices 13, 23, and channel processors 14, 24. A channel controlling device 3 is connected to the respective controlling devices 13, 23 and provided with a central processor interface part 31 and a local storage 32. A system discriminating element setting means SID is incorporated in the interface part 31. The processors 11, 21 in respective systems S1, S2 set up and release the setting means SID and the buses are switched dynamically at the channel level in accordance with the schedules of the processors 11, 21.

Description

Detailed Description of the Invention (5) Technical Field of the Invention The present invention relates to a main storage device, a medium-heat storage device, and a channel device to which input/output devices are connected. Human output vital diagnosis 5: This relates to a channel device that controls execution, and it is necessary to relate to a channel control device that can be commonly connected to multiple data processing systems.

(13) Prior art and one problem In general, in a conventional loosely coupled system in which multiple data processing systems are loosely coupled, i:j, , one 11
7) Is there a different system for all human output devices?・Configure as follows. Narai, each prefecture is equipped with a unique V-nel +:=
I needed v.

Zunawara, part 11 respectively above 1. In the first data processing system system, which includes the above-mentioned control, central processing unit, etc., one specific input/output device from the first data processing system system ( For example, output the ``I1'' information to the magnetic disk ffi<], and
When +rffi JIQ is extracted from a data processing system, at least a separate channel is required for each data processing system.

For example, if the data processing system 7 system is outputting information to a magnetic disk device, another data processing system system 2
Since then, this magnetic disk drive (J) cannot be activated, and the channel device #e is in an idle state.
Put it away.

(Q. Purpose of the Invention) Accordingly, the purpose of the present invention is to overcome the disadvantages mentioned in E, to be able to connect to multiple data processing systems in common, and to perform data processing at the channel level under the schedule of the central processing units of both systems.・It is possible to eliminate the need to switch between the f

(2) Structure of the Invention In order to achieve the above object, the present invention includes at least a main memory device and a central processing unit, and between the main memory device 1,
At least the first one does not have a means of direct communication between central processing units. g2 data processing system, said first .g2 data processing system.
An equivalent interface L for the second data processing system.
9 control unit which controls the execution of input/output commands for multiple lower channel devices under the control of the 11 devices outside the center of either data processing system. M
1. Enter the system identifier indicating which system the control device is connected to.
) the system identifier is set or canceled by the central processing unit of each dark processing system, and depending on the content of the system identifier, the system Can't connect/switch to system? It is a sign.

(G) Embodiment of the Invention Figure C shows one implementation of the present invention. In the figure, 81 indicates a data processing system system 1, 82 indicates a data processing system system 2, 1.2 are respectively central processing units 11.21. Main memory device 12゜22, main memory control device? i(t 3.23. Channel processing device 14
．． 1. 31 is a child control device that includes 24; 31 is a central processing unit interface; 7. 1 is a control unit; 32 is a local storage; SID is a system identifier setting means *a-d are paths Indicates a switching control signal.

As shown in the figure, central processing units tii and 2i, respectively.

Main storage device 12.22. Main memory control device 13, 23. There is a first data processing system S1 and a second data processing system S2 including devices such as channel processing devices 14 and 24, and the main storage device 12 and 22 are located between the central processing units 11 and 21. There is no direct means of communication. The present invention has an equivalent central processing unit interface for these data processing systems, and executes input/output commands for a plurality of lower channels under the control of the central processing unit λ. This is common to channel control devices M and f. This channel control device has a system identifier setting means SID in the central processing unit earp-face control section 31, and according to the system identifier ID set by this SID, the path is established between the lower channel device and the corresponding data processing system 81 (ID =1) Also HaS 2
(ID=This will be changed in February.

The method for setting the system identification will be explained below. First, the initial reset state - C [Jin's two V channel control device 1 device 3, which system S], S2. It is also included in the display. Then f! 1-Q': The central processing unit 11 is disconnected from the suspended system Sl.
For 1-1it device 3, among multiple failures, 7 no.ra1F4'A? , [Specify one channel, channel Y channel,
11 included →, instruction (/stem identifier cent cl instruction) 7i
- System identification 7 indicating that the 881 system has been installed by the system and identifier setting means SID of the channel control device 3.
(II)=IJ is set and the channel device remembers that it is coupled with the first system in its own 4
- holds the system identifier (1] J=1). (If 1, this channel built-in instruction is the system identification -f-
Similarly, if (I D = 1.) is not held and emanates from the second system, the system
When the channel device is incorporated into the first system S1 in this way, the channel control device 3 receives an input/output command.

response, transmission of the engineering 10 interrupt (in addition to normal interrupts, it has the two types of system identifier reset request interrupts and system identifier reset completion interrupt independently), data bus communication with systems other than response, etc. All interface lines are routed to the system S1 . Alternatively, the path is switched by control signals a to d to connect to system S2. 81f in the figure indicates an interface to or from a channel device.

Then some channel device connects to the first system S as described above.
The operation when this channel device is installed from the second system S2 when the channel device is installed by the system S2 will be described.

Currently, all commands other than the one command described later are disabled from the second system S2 for the channel device that holds the system identifier ID = 1 indicating that it is incorporated in the first system. A response will be sent with the event code shown.

And from the second system S2 (7) 1+il;-ノoperation i"iJfunction1!iT order):ll,;"-'-/
” , /% 1llll # , 4111:r change request 61
It is the 1st order, and this, 115th order is tribr, :? Le control device 3C decodes this and 2ry J's C7 (Teno\
Okawakashi S11 enters the central processing unit 11 of S] with an interrupt level of /nuj゛no/identifier rehit request.
')-2"fj not this interrupt redundancy j'after the second system S2 70° condition code 711-M-4"t, further im
iic central central mountain ri i1 yoshi 11 ill reply to this! 0 channel control υ111 that can generate the I:++ imprint M-i (zo:', ram identifier reset) command.
Noboru jri +'+ is the system 6 of Jin, and the system Σ-1 of the system Σ-1, i + * Besshi is lyse node and system steno of uc2, 7Jl to S2,, system identification-J
'l) Notify the effect of set photon ゛4Shi! le'i
? ? Performs two output interrupts. System S24;i,
3 ratios, Bouyanel built-in commands (system, merchandising set commands), V channel ttt control device j + 3
Light is emitted for number El, and photons are emitted from the set.

at least the first . coupled to a second data processing system; A subsystem having an equivalent interface to a second data processing system and under control of the central processing unit of either data processing system.
A control device that controls the execution of input/output instructions for a number of channel devices. The i11 device has means for setting a system identifier indicating which data processing system it is coupled to, and the system identifier is set or cleared by the central processing unit of each data processing system, and the system identifier is set or cleared by the central processing unit of each data processing system. This system is characterized in that the path is switched to a path that connects the lower channel device and the corresponding data processing system according to the request, and the channel device can be connected to multiple data processing systems, and the central processing of each system It is extremely effective because path switching can be performed dynamically under the device.

[Brief explanation of the drawing]

The figure is a diagram showing an embodiment of the present invention, and in the figure, Sl indicates a data processing system system 1, and S2 indicates a data processing system system 2 (not shown).

Claims (1)

[Claims] each having at least a main storage device and a central processing unit;
At least the first one does not have a means of direct communication between main storage devices and central processing units. @2 data processing system, and the first. Control that has an equivalent interface to a second data processing system and controls the execution of input/output instructions for a plurality of lower-level channel devices under the control of the central processing unit of one of the data processing systems. The apparatus has means for setting a system identifier indicating which data processing system the controller is coupled to, the system identifier being set or cleared by the central processing unit of each data processing system, and having means for setting a system identifier indicating which data processing system the controller is coupled to. A channel control method characterized by switching a bus to a path connecting a lower channel device and a corresponding data processing system according to the contents of a system identifier.