JPS62291752A - Disk control device - Google Patents

Abstract

PURPOSE:To eliminate an overhead by a software or the uncertainty of collected information by using a hardware at an input/output device so as to collect various information with respect to the input/output to a disk issued by a central processing unit at the actual operation by the instruction of an operating system. CONSTITUTION:An input/output instruction issued from the central processing information is analyzed by using a mechanism in a director 25a and an input/ output information collection control section 27 uses the analysis information and the input/output instruction to obtain the relation information relating to the access position, kind of instruction, input/output and data transfer quantity and writes them to a location corresponding to a buffer memory 26. When the input/output instruction designates the access location, the location is stored in an access location storage section 31. In receiving an input from the input/ output instruction, the data transfer quantity is stored in an input information storage section 32 and in receiving an output from the instruction, it is stored in an output information storage section 33 and in receiving a control instruction, the control data transfer quantity is stored in a control information storage section 34.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a disk control device in a computer system.

[Conventional technology]

Conventionally, the input/output information collection function that has been used by disk control devices only collects the number of input/output accesses and the total number of bytes of data read by the disk control device for each spindle. Therefore, the means and methods used to obtain more detailed characteristic information regarding the I/O commands issued by the central processing unit to the disk according to instructions from the operating system mainly utilize the monitoring mechanism provided in the computer system. , information was collected from the input/output instructions using software. This will be explained using FIG.

In FIG. 2, 10 is a central processing unit, 11 is a main storage device, 12 is a channel, 13 is an external storage device, 14 is an operating system, 15 is a CCW group, and 19 is a monitoring routine.

Further, 14' and 19' indicate the flow of processing within the operating system and monitoring routine, respectively.

Based on instructions from the operating system 14, the central processing unit 10 stores an external storage device 13 such as a disk controller.
When issuing an input/output command to the external storage device, the operating system first issues instructions to the channel 12, which is located between the external storage device and the computer system and which actually performs input/output operations to the external storage device. A command (CCW) group 15 to be executed is created, and then an input/output start command 16 is issued to the channel. In the information collection method using the monitoring mechanism, a monitor call instruction 17 is placed at the start of this input/output, which is a hook that generates a monitor interrupt, and in the monitoring routine 19 to which control is transferred as a result of the interrupt 18, CCW group 1 upper 5 is placed. Collect information.

[Problem that the invention seeks to solve]

Therefore, in the conventional technology as described above, a certain amount of software overhead occurs for each human output. In addition, when collecting CCW group 1 group top 5 information in the monitoring routine, the CCW to be executed depends on the state of the external storage device 13.
When the group changes or as specified by a specific bit in the CCJ, an interrupt is issued to the CCW execution central processing unit, and the CCW
Because they may rewrite themselves, collecting information through monitoring routines has the drawback of creating uncertainties.

An object of the present invention is to provide a disk control device that makes it possible to reduce software overhead.

[Means for solving problems]

In the present invention, an input/output information collection control mechanism installed in a disk control device monitors input/output performed by a disk device controlled by the disk control device, and in addition to information collected conventionally, input/output characteristics Collect more detailed information necessary to know the information, record it in the storage device in the disk controller, and use the collected information as the main information in response to a specific occasion or a newly provided information read command. Transfer to storage device. The central processing unit analyzes the reported data using a monitoring information analysis program to obtain the input/output characteristics of the computer system.

[Effect]

According to the above-mentioned configuration, by using hardware on the input/output equipment side to collect various information related to human output to the disk that is issued by the central processing unit during actual operation according to instructions from the operating system, it is possible to Overhead due to rough 1-ware, which was a drawback of the technology,
Alternatively, uncertainty in collected information can be resolved.

〔Example〕

An embodiment of the present invention will be described below. First, FIG. 1 shows an example of the configuration of a computer system including a disk control device according to the present invention. In FIG. 1, 20 is a central processing unit, and 21 is a main storage device.

22a and 22b are channels, 23 is a disk controller,
24 is a group of disk drives. Central processing bag bj'1
20 decodes the program instructions and drives the disk drive! 2
If there is an input/output command to channel 24, the command is issued to channel 22a or 22b.

Main memory 21 stores information transferred between central processing unit 20 and disk drive 24 .

Channels 22a and 22b are the main storage devices! The disk controller 23 transfers data between the channels 22a and 22b and the disk drive 24.

The disk controller 23 controls the channels 22a and 22
It is composed of directors 25a and 25b that transfer data between the disk drive device 24 and the disk drive device 24, and a buffer memory 26 that stores collected input/output characteristic information. This buffer memory is newly provided in order to realize the present invention.

The directors 25a and 25b also include input/output information collection control units 27i and 27b that extract input/output characteristic information from input/output commands sent to the disk control device and control reporting of the information to the central processing unit. Newly established.

Next, an overview of the operations at the time of collecting and reporting information on the number of people in this embodiment will be explained. When an input/output request to the disk drive device occurs during program execution, the central processing unit 20 issues an input/output command to the director 24a or 24b via the channel 22a or 22b. For simplicity, channel 22a and director 2.5a will be explained below as an example.
The same is true for 5b.

Now, the turnout command issued by the central processing unit is analyzed using a mechanism within the director 25a (not shown). The crowd information collection control unit 27a determines the access position based on the analysis information and input/output commands.

Information regarding the type of instruction, type of input/output, and amount of data transferred is obtained and written to the corresponding location in the buffer memory 26. An example of the configuration of this buffer memory is shown in FIG. The buffer memory 3o is provided for each disk spindle controlled by the disk 1 control device, and includes an access position storage section 31, a remote information storage section 32. Output information storage section 33
．． It is composed of a control information storage section 34. If the input/output command passed to the director specifies an access position, the position is stored in the access position storage section 31.

If the input/output instruction is an input or output instruction,
In the case of input, the data transfer amount is stored in the input information storage fi+32, and in the case of output, the data transfer amount is stored in the output information storage section 33. Further, if the input/output command is a control command, the control data transfer amount is stored in the control information storage section 34. The latest access position information is always written, and the data transfer amount information is accumulated since the last read. Once read, the contents of the buffer memory are cleared. However, the only exception is that the instruction to read the value of the buffer memory is not subject to information collection.

Next, the operation of reading the value of the buffer memory will be explained. When the central processing unit needs to collect input/output characteristic data, it sends information to the spindle for which information is to be collected, according to instructions from the program.

Newly provided buffer memory 26 read command (
Read Monitor Data (referred to as RMD command) is issued. An example of the RMD command is shown in Figure 4.
In FIG. 4, 40 is an RMD instruction instruction code.

41 is a flag, 42 is the number of bytes to be transferred, and 43 is a buffer memory content transfer destination address. When the input/output information collection control unit 27a receives an RMD command, the input/output characteristics are transferred from the buffer memory for the specified spindle. The information is read out, the data is transferred to the main memory location specified by the sofa memory content transfer destination address 43 via the channel, and then the buffer memory is cleared. The above procedure is shown in FIG.

The central processing unit edits and analyzes the input/output characteristic information using another input/output information analysis program which is not explicitly disclosed in this patent, and obtains comprehensive input/output characteristic data.

〔Effect of the invention〕

The effect of the means described in the present invention is that the monitoring overload for determining the human output characteristics of a computer system can be significantly reduced. For this reason.

The collection of input/output characteristic information, which traditionally had a large overhead and degraded the performance of computer systems in actual operation, is now possible.
This can be done without degrading performance.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a computer system including a disk control device embodiment of the present invention, FIG. 2 is an explanatory diagram of a conventional system using a monitoring mechanism, FIG. 3 is an explanatory diagram of an embodiment of a buffer memory, and FIG. The figure is an explanatory diagram of an embodiment of the RMD command, and FIG. 5 is an explanatory diagram of the procedure for collecting input/output information and reporting it. 10 and 20... central processing unit, 11 and 21...
Main storage device, 12, 22a and 22b...channels. 13... External storage device, 14... Operating system, 15... CCW group, 16... I/O start instruction, 17... Monitor call instruction, 18... Monitor call interrupt, 19...・Monitoring routine, 1
4' and 19'...process flow, 23...disk control device. 24...Disk drive group, 25a and 25b...
- Director, 26 and 30...buffer memory. 27a and 27b...input/output information collection control unit, 31.
...Access position storage section, 32...Control information storage section,
33... Input information storage section, 34... Output information storage section. 40...RMD instruction instruction code, 41...Flag,
42... Transfer pie 1 to number, 43... Buffer memory content "fJI" Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A disk control device that controls input/output to the disk device in a computer system that has one or more external storage devices including a disk device and performs processing while performing input/output with the device. has a mechanism for monitoring input/output from the central processing unit of the computer system to the disk device and collecting characteristic information such as input/output location, input/output type, input/output data transfer amount, and information regarding the input/output. A disk control device characterized by realizing the acquisition of. 2. The computer system has a mechanism for monitoring input/output from a central processing unit to a disk device, acquiring information regarding the input/output, and reporting the acquired information in response to a request from the central processing unit. A disk control device according to claim 1.