JPS63121949A - Disk cache device - Google Patents

Abstract

PURPOSE:To eliminate such processing that an area to be diagnosed is saved in an external storage device at the time of making a diagnosis on a magnetic disk device by providing a diagnosis mode specification part and a disk diagnosis control part. CONSTITUTION:With a diagnosis mode set, the diagnosis mode specification part 47 reports the diagnosis mode to the disk diagnosis control part 46. When a magnetic disk controller 3 requests the magnetic disk device 5 to write by running a diagnosis test program, the disk diagnosis control part 46 instructs an interface control part 41 not to report that data is written into the magnetic disk device 5, and temporarily holds the effect in the disk diagnosis control part 46. In that state the disk diagnosis control part 46 requests that a cache control part 44 reads information on the area to be diagnosed to a cache memory part 45 from the magnetic disk device 5. The cache control part 44 accumulates information from the magnetic disk 5 in the cache memory part 45 through a data transfer part 43.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an in-disk diagnostic device that performs diagnosis by temporarily saving the area to be diagnosed in a cache memory section during diagnosis.

(Prior Art) Conventionally, as shown in FIG. 2, this disk storage device is connected between a magnetic disk controller f3 and a magnetic disk device 5, and is connected between a magnetic disk controller f3 and a magnetic disk device 5. The information obtained when a write/read request is made to the disk drive unit 7 is stored in the disk drive unit 4, and is then used as the purpose when a read request is made to the magnetic disk unit 5 from the three magnetic disk control units. If the information is stored in the disk storage device 4, the information stored in the disk cache device f4 is transferred to the magnetic disk controller R3 without making a read request from the disk storage device 4 to the magnetic disk device 5. , thereby shortening the processing time of the information processing system including the central processing unit 1 and the input/output control unit R2.

Next, the configuration and operation of the conventional disk cache device will be explained in detail with reference to FIG.

When a read request is made from the magnetic disk control device 3 to the magnetic disk device 5, the interface control unit 4 in the disk storage device 4 receives an instruction from the magnetic disk control device 4, and sends the instruction to the magnetic disk device 5.
The instructions will be conveyed to 4. The flat disk control section 44 refers to the control table section 42 and checks whether the track on the magnetic disk device f5 that the magnetic disk control device 3 attempts to access exists in the medium disk memory section 45. If the corresponding track exists in the transfer memory section 45, the transfer control section 44 instructs the data transfer section 43 to transfer the corresponding information to the magnetic disk control device 3 via the interface control section 41. do.

If the corresponding track is not in the cache memory section 4S, the player control section 44 requests the magnetic disk device 5 for the corresponding information via the interface control section 41, and the transferred information is sent to the interface control section. 41 to the magnetic disk controller 3, and at the same time, the data is transferred to the internal memory unit 4 through the data transfer unit 43.
The track information is stored in the control table section 42 in preparation for a subsequent read request from the magnetic disk control sections # and 3 to the magnetic disk device ts.

In addition, the magnetic disk controller 3 sends information to the magnetic disk device S.
When a write request is made to the magnetic disk capacity S, the interface control unit 41 directly transmits the write instruction to the magnetic disk capacity S to the magnetic disk device 5, and
A similar instruction is given to the 1,000-yash control unit 44. The cache control section 44 instructs the data transfer section 43 to store information to be transferred from the magnetic disk control device 3 to the magnetic disk device i5 in the storage memory section 45, and stores the track information in the control table section 42. The data is stored in preparation for a subsequent read request from the magnetic disk control device 3 to the magnetic disk device 5.

(Problems to be Solved by the Invention) Most of the above-mentioned conventional magnetic disk devices are fixed magnetic disk devices, and the person operating the information processing system has no knowledge of the part of the magnetic disk device 5 in which information is written. Since it is not removable, the magnetic disk drive cannot be used in the event of a failure.
5, the information stored in the magnetic disk device 5 should be temporarily saved to another magnetic disk device or other external storage device (for example, a magnetic tape device) and It is necessary to diagnose the disk device, and after the diagnosis, it is necessary to return the saved information to the original area of the corresponding magnetic disk device S, which has the disadvantage that diagnosing the magnetic disk device is troublesome. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk shunting device that eliminates the need to save a diagnostic area to an external storage device when diagnosing a magnetic disk device by adding a small amount of hardware.

(Means for Solving the Problems) In order to achieve the above object, a disk storage device according to the present invention includes a disk storage device connected between a magnetic disk control device and a magnetic disk device.
a diagnostic mode instruction section that instructs or cancels the diagnostic mode;
When the diagnosis mode is instructed by the diagnosis mode instruction section, the information of the area to be diagnosed where the access instruction to the magnetic disk device has been issued from the magnetic disk control device is temporarily saved in the cache memory section, and then the disk cache function is performed. is disabled to directly transfer information between the magnetic disk control device and the magnetic disk device, and when the diagnostic mode is canceled by the diagnostic mode instruction section, the information temporarily saved in the intermediate memory section is re-transferred. and a disk diagnosis control section that controls storage in the area to be diagnosed of the magnetic disk device.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a disk cache device according to the present invention.

In FIG. 1, parts that perform the same functions as those of the conventional example shown in FIG. 3 are given the same numbers.

In the present invention, a disk diagnosis control section 46 and a diagnosis mode instruction section 47 are further added.

The diagnostic mode instruction unit 47 is for instructing whether or not to diagnose the magnetic disk device S, and the diagnosis is performed according to instructions from maintenance personnel.

Maintenance personnel installed the magnetic disk device5. When performing a diagnosis, the switch of the diagnosis mode instruction section 47 is set to the diagnosis mode (or vice versa, the normal mode), and the central processing unit (see Figure 11E2) runs the diagnostic test program.

When the diagnosis mode instruction section 47 is set to the diagnosis mode,
It notifies the disk diagnosis control unit 46 that it is in the diagnosis mode.

The diagnostic test program generally writes/reads the area to be diagnosed on the relevant magnetic disk device,
This is to confirm the normality of the data. When a write request is made from the magnetic disk control device 3 to the magnetic disk device S by running the diagnostic test program, the disk diagnostic control section 46 requests the interface control section 4
1 not to transmit a write instruction to the magnetic disk device S, and the write instruction information is held in the primary disk diagnosis control unit 46. In this state, the disk diagnosis control section 46 requests the cache control section 44 to read out information of the area to be diagnosed in which a description is to be written from the magnetic disk device 5 to the intermediate memory section 45 .

The cache control unit 44 receives the read instruction from the magnetic disk device fE! via the interface control unit 41. The corresponding information is requested from Ic, and the information from the magnetic disk device S is stored in the intermediate memory section 45 through the data transfer section 43 without being transferred to the magnetic disk control device t3.

When the information on the diagnostic test area has been saved, the disk diagnostic control unit 46 uses the temporarily held write instruction information to the magnetic disk unit 5 to write to the magnetic disk unit S through the entire interface control unit 41. conduct. Thereafter, the diagnostic test glodarum issues a read request to the area to be diagnosed, compares the write information and read information to determine whether they match, and confirms the normality of the device. In this case, the interface control unit 41 performs control so that the disk cache device 4 is bypassed and a read request is made to the magnetic disk device 5 based on the diagnosis mode notification from the disk diagnosis control unit 46.

When the running of the diagnostic test program is completed, the maintenance person returns the switch of the diagnostic mode instruction section 4F to the normal mode.

When the disk diagnostic control unit 46 is notified of the state change from the diagnostic mode to the normal mode by the diagnostic mode instruction unit 47,
Temporary cache memory unit 45 for data transfer unit 43
The information on the diagnostic area of the magnetic disk device 5 that has been saved is instructed to be re-stored in the magnetic disk device 5 via the interface control unit 41.

In this actual example, the information written at the time of diagnosis is held in the disk diagnosis control unit 46 until the information of the area to be diagnosed of the magnetic disk device 5 is saved to the cache memory unit 45, and the disk diagnosis is performed at the end of the save. The case where the control unit 46 writes the stored write information to the magnetic disk device 5 has been described, but when the information saving of the area to be diagnosed is completed, a write request is made again to the magnetic disk control unit WLS, and the disk cache is The present invention can also be applied to the case where information is written to the magnetic disk device 5 while bypassing the device 4.

Further, in this embodiment, a case has been described in which the diagnostic mode instruction section 47 is built in the disk cache device 4, but a command from the magnetic disk control section #3 causes the disk cache device 4 to Diagnostic control unit 46
The present invention can also be applied to a disk cache device that instructs a diagnostic mode. In this case, by flexibly setting and canceling the diagnostic mode, it is possible to diagnose the entire area of the connected magnetic disk device 5 without being aware of the capacity of the intermediate memory section 4S.

(Effects of the Invention) As is clear from the above description, the present invention provides a means for instructing a conventional disk drive device to perform a diagnosis mode, and a temporary disk drive for a diagnosis area of a magnetic disk device that is accessed during the diagnosis mode. By adding a small amount of hardware to diagnose the magnetic disk device after evacuating it to the internal storage device, maintenance personnel do not need to save the area to be diagnosed to an external storage device when diagnosing the magnetic disk device. This has the effect of eliminating troublesome operation and operational errors that may occur as a result.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a disk storage device according to the present invention, and FIG. 2 is a block diagram showing a general information processing system including a disk central processing unit.
FIG. 8 is a block diagram showing a conventional disc inserting device. l...Central processing unit 2...Input/output control device 3...Magnetic disk control device 4...-〇 Disk processing device 5 fist...Magnetic disk device 41...Interface control unit 42...Control Table section 4311 e-data transfer section 44...Cache control section 45...Cache memory section 46...Disk diagnosis control section 4F...Diagnosis mode instruction section

Claims (1)

[Claims] In a disk cache device connected between a magnetic disk control device and a magnetic disk device, a diagnostic mode instruction section for instructing or canceling a diagnostic mode; After the information of the area to be diagnosed where the control device has given an access instruction to the magnetic disk device is temporarily saved in a cache memory section, the disk cache function is disabled and the information is transferred directly between the magnetic disk control device and the magnetic disk device. A disk diagnosis that controls the transfer of information so that the information temporarily saved in the cache memory section is stored again in the diagnosed area of the magnetic disk device when the diagnosis mode is canceled by the diagnosis mode instruction section. A disk cache device characterized in that it is configured by providing a control section.