JPH11259363A - Memory control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten access time from a host computer to a magnetic disk device in a computer system in which the input/output request range of data from the host computer is estimated in accordance with specified data, day of the week, or time. SOLUTION: The data of the range to perform a read request from a host computer 101 at the specified time on the specified date or day of the week is preset from a service processor 106 and corresponding to a request from the service processor 106, data transfer to a cache memory 107 is performed to a magnetic disk device 103 by a control processor 104. Thus, the access to the magnetic disk device 103 for the read request from the host computer 101 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to shorten the access time for an input / output request from the host computer of a computer system in which a read request is made within a certain range for each specific date and time and day of the week from the host computer. The present invention relates to a storage control device including a cache memory.

[0002]

2. Description of the Related Art In a storage control device having a cache memory, data to be input / output requested from a host computer to a magnetic disk device is stored in the cache memory so that the access time from the host computer to the magnetic disk device can be reduced. Shortening is possible.

[0003] In operations performed by computer systems, specific operations are often performed on specific dates, days of the week, and specific times, as typified by payroll calculations and system backups.

For this reason, the range of input / output requests from the host computer to the magnetic disk device often becomes a specific range on a specific date, a day of the week, and a specific time.

[0005] In such a case, if data expected to be input / output requests from the host computer can be stored in the cache memory provided in the storage control device in advance, the access time can be reduced.

As a method for realizing the above function, for example, a cache binding mode, which is one of cache management algorithms for instructing a storage control device from a host computer to make a designated track resident in a cache memory, is a HITAC H mode. -6581-C3 type disk controller H-6586 type disk drive H-6585
Type Disk Drive H-8598 is disclosed in the Disk Drive Manual.

A service processor connected to the control processor acquires statistical information of input / output requests to the magnetic disk device from the host computer for one day,
A method of selecting data to be stored in the cache memory the next day based on the statistical information has been considered.

[0008]

SUMMARY OF THE INVENTION The above-mentioned HITAC
H-6581-C3 type disk controller H-6586 type disk drive H-6585 type disk drive H-
In the conventional technique disclosed in the 8598 disk drive manual, it is necessary to instruct data to be stored in the cache memory from the host computer.

In an environment where different host computers are connected as represented by an open system, few host computers have such a function and a plurality of types of host computers are connected. It is difficult to support this feature.

Further, in the method using the statistical information of the input / output request from the host computer, only the information of the previous day can be referred to. Therefore, it is not applicable to a computer system that performs different tasks for each specific day or date. difficult.

An object of the present invention is to set data to be stored in a cache memory from a service processor provided in a storage control device for each specific day or date or time, from the service processor, and to set the specified specific day of the week. The storage controller transfers data set from the service processor to the cache memory from the magnetic disk device to the cache memory at the time, date, and time, so that the host computer does not need to issue an instruction from the host computer. An object of the present invention is to provide a storage control device which can store data expected to input / output to a disk device.

Another object of the present invention is to provide a computer system that performs different tasks on a specific day, date, or time by designating a read request range from a service processor on a specific day, date, or time. An object of the present invention is to provide a storage control device capable of improving performance.

[0013]

In order to achieve the above object, the present invention comprises a storage controller for controlling input / output from a host computer, and various storage media for storing input / output data of the host computer. The storage control device in a computer system, comprising: a control processor connected to the host computer for requesting input / output from the host computer to various storage media; and temporarily storing input / output data of the host computer. A cache memory, and a service processor connected to the control processor and used for maintenance and diagnosis of the storage controller, wherein the service processor sets a range of the read request of the host computer with respect to a date or a day of the week or time. Input / output means for controlling Output means for requesting a processor (hereinafter referred to as staging) for transferring a read request range set in the management table for the date, day of the week, or time from the various storage media to the cache memory; Wherein the control processor includes means for staging the range of the staging request on the cache memory in response to the staging request from the service processor, and a variety of storage media from the host computer for date or day of the week or time in advance. The access time from the host computer can be reduced by staging the range of the read request to the cache memory on the date, day of the week, or time.

Further, in the storage control device, the service processor can store a required range of input / output data from a host computer in a specific time zone at a specific time.

Further, in the storage control device, data in a read request range set for a condition combining date and time or day and time is stored in the cache memory at the date and time or day and time. It is possible to stage.

[0016]

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

FIG. 1 is an explanatory view showing the principle of operation of the present invention. A host computer 101, a storage controller 102 for controlling input / output from the host computer 101, and a magnetic storage for storing input / output data of the host computer 101 are shown. FIG. 2 is a configuration diagram of a computer system including a disk device 103.

In FIG. 1, a host computer 101
Is the magnetic disk drive 1 via the storage control device 102.
03 is connected.

The storage control device 102 is a control processor 1
04 and a cache memory 107.

The control processor 104 includes signal lines 108 and 1
09, 110, 111, 112, 113, 114, 11
5, a service processor 106 provided with a host computer 101, a cache memory 107, an external input / output unit 105, and a magnetic disk device 103.

The control processor 104 incorporated in the storage controller 102 controls the data transfer between the host computer 101 and the magnetic disk device 103.

When a read request to the magnetic disk device 103 is issued from the host computer 101 and there is data matching the read request in the cache memory 107, the control processor 104 sends the data from the cache memory 107 to the host computer 101. Data transfer. If there is no data that matches the read request in the cache memory 107, a read request is issued to the magnetic disk device 103 via the signal line 112, and data is transferred from the magnetic disk device 103 to the cache memory 107. The control processor 104 performs data transfer to the host computer 101 after data transfer from the magnetic disk device 103 to the cache memory 107 is completed.

The service processor 106 has a signal line 114
Issues a maintenance and diagnostic request to the control processor 104 via the control processor 104. Upon receiving the request, the control processor 104 executes the request from the service processor 106.

The service processor 106 has a keyboard 1
External input / output means 1 having a display 16 and a display 117
05.

Hereinafter, the operation of the present invention will be described.

The service processor 106 uses the external input / output means 105 to read from the host computer 101 for a specific date, a specific day of the week, or a specific time (for example, a cylinder number and a head number, or a logical block address). Can be set.

The service processor 106 prepares a read request range from the host computer 101 for a specific date, a specific day of the week, or a specific time inputted by using the external input / output means 105 in the service processor 106 shown in FIG. It is stored in the form of the read request management block 200.

The read request management block 200 includes four read request ranges from the host computer for a specific date, a specific day of the week, or a specific time input by using the external input / output means 105. Stores data.

The four data are the day 201, date 202, and time 203 input using the external input / output unit 105.
And the read request range 204.

FIG. 3 is a flow chart of the read request issuing processing section (300) of the service processor 106.

In order to check the read request management block 200 at regular time intervals, the service processor 106 determines whether or not a certain time has passed since the previous check (301). If the predetermined time has not elapsed, the read request issuing process ends (305). If the predetermined time has elapsed, the date, day of the week, or time of the check and the day of the week 201 stored in the read request management block are stored in the read request management block (200).
Alternatively, it is determined whether there is a read request management block 200 that matches the date 202 or the time 203 (3
03).

If not, the process ends (305).

If it exists, a request to read the read request range 204 set in the read request management block 200 from the magnetic disk device 103 to the cache memory 107 is sent via the signal line 114 to the control processor 104.
(304).

FIG. 4 is a flow chart of the staging request issuance processing unit for the magnetic disk device of the control processor 104 (400).

The control processor 104, which has received the request from the service processor 106, performs a staging process from the magnetic disk device 103 to the cache memory 107. A job is generated (401). By using an asynchronous job, a staging request to the magnetic disk device 103 can be made in parallel with an input / output request from the host computer 101.

The asynchronous job is transmitted to the service processor 10
It is determined whether or not the read request range 204 requested from No. 6 exists in the cache memory 107 (402).
If there is, this process ends (404). If not, a request for data transfer to the cache memory 107 is issued to the magnetic disk device 103 (403).

The magnetic disk device 1 that has received the transfer request
03 transfers data to the cache memory 107, so that the read request range 204 preset from the outside to the service processor 106 can be placed on the cache memory 107 on a specific day, a specific date, or a specific time. It becomes possible.

The control processor 104 can store a range of input / output requests from the host computer 101 at a specific time and transmit the range to the service processor 106 via a signal line 115.

[0039]

As shown in the above embodiments, according to the present invention, on a specific date, a specific day of the week, and a specific time,
The storage control device places data expected to be used by the host computer in the cache memory in advance, thereby enabling data transfer from the cache memory to the host computer in response to an input request from the host computer. In addition, the number of accesses to the magnetic disk device can be reduced, and the access time from the host computer can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a computer system illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a read request management block.

FIG. 3 is a diagram illustrating a flowchart of a read request issuance processing unit.

FIG. 4 is a diagram showing a flowchart of a staging request issuing unit for the magnetic disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Host computer, 102 ... Storage control device, 103 ... Magnetic disk device, 104 ... Control processor, 105 ... I / O means, 106 ... Service processor, 107 ... Cache memory, 108-115 ... Signal line, 116 ... Keyboard, 117 ... display, 200: read request management block, 201: day of the week, 202: date, 203: time, 204: read request range.

Claims (3)

[Claims] 1. The storage control device in a computer system, comprising: a storage control device for controlling input / output from a host computer; and various storage media for storing input / output data of the host computer. A control processor connected to a computer for requesting input / output requests from the host computer to various storage media; a cache memory for temporarily storing input / output data of the host computer; and the storage control device connected to the control processor A service processor used for maintenance and diagnosis of the host computer, the service processor comprising: an input / output unit for setting a range of a read request of the host computer with respect to a date or a day of the week or time; The date or day or hour Output means for requesting a process (hereinafter, referred to as staging) for transferring a range of a read request set in the management table with respect to the time from the various storage media to the cache memory; Means for staging the range of the staging request on the cache memory in response to the staging request from the processor, wherein the range of the read request from the host computer to the magnetic disk device with respect to date or day of the week or A storage control device characterized in that access time from the host computer can be reduced by staging on a cache memory at a date, a day of the week, or a time. 2. The storage controller according to claim 1, wherein said service processor is capable of storing a required range of input / output data from a host computer in a specific time zone at a specific time. Storage control device. 3. The storage control device according to claim 1, wherein data of a read request range set for a condition combining a date and a time or a day and a time is stored in the date and time or a day and a time. A storage controller characterized in that it is staged on a cache memory.