JPH07271519A - Disk controller - Google Patents

Abstract

PURPOSE:To attain the fast accesses to the discontinuous records which are managed by a disk by performing the continuous accesses to the number of records equal to the processed records when an access instruction is decided as a continuous and simultaneous access instruction. CONSTITUTION:When a receiving means 20 receives an SIO from a host 11, a deciding means 21 decides whether an access instruction is equal to a continuous and simultaneous access instruction based on the operation type of the received SIO. When a continuous and simultaneous access instruction is recognized, a seek instruction issuing means 22 designates the seek value of the received SIO and issues a seek instruction. An access executing means 24 has the continuous accesses to the records of number equal to the processed records after the record showing the search value when the continuous and simultaneous access instruction designates a processed record number. Thus it is possible to have the continuous accesses at a high speed to two discontinuous records existing on the same track by a single SIO operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk controller for controlling disk access, and more particularly to a disk controller for realizing high speed access processing.

In order to speed up data processing, a disk control device that executes disk access control is
It is necessary to build a configuration that realizes high-speed access processing.

[0003]

2. Description of the Related Art Magnetic disk controllers for controlling a magnetic disk include an asynchronous transfer type magnetic disk controller which uses a buffer and a synchronous magnetic disk controller which does not use a buffer.

FIG. 15 shows the configuration of an asynchronous transfer type magnetic disk controller. As shown in this figure, the asynchronous transfer type magnetic disk control device includes a channel adapter 1 for executing data communication with a channel on the host side, a device adapter 2 for executing data communication with a disk (device), A resource manager 3 for executing resource management, a task control block 4 developed in a memory area of the resource manager 3, an asynchronous transfer buffer 5 provided between the channel adapter 1 and the device adapter 2, and these are connected. With bus 6
The channel adapter 1 and the device adapter 2 each independently execute processing asynchronously, so that the disk access control processing is executed. In the drawings, the channel adapter 1 may be abbreviated as CA and the device adapter 2 may be abbreviated as DA.

The conventional technique will be described by taking the asynchronous transfer type magnetic disk controller having the above-mentioned structure as an example.
When accessing a record, it is necessary to position the record. However, in the conventional asynchronous transfer type magnetic disk controller, when the records to be accessed are continuous, the record is positioned to the first record and the target to be accessed. When the records are not continuous, each record is positioned as it is.

That is, the host issues SIO (Start I / O) once when the records to be accessed are continuous, and has the SIO when the records to be accessed are not continuous. Due to the number of bytes, one SI
Corresponding to the fact that the positioning process that can be designated by O is only once, SIO is issued for the number of discontinuous records.

For example, in the conventional asynchronous transfer type magnetic disk control device, when updating the discontinuous records n and m, as shown in FIG. 16, first, the first issue by the host is performed. SIO (Start I / O) operation type of write access, seek value for disk (seek cylinder, seek head) / set sector value, and search value for record n (search cylinder, search head, record count value) Is sent, a seek command is issued to move the arm of the disk to the physical position indicated by the seek value.

Then, the record n having the search value notified from the host is searched to search the record n. When the positioning to the record n is completed by this search process, the update data sent from the host is updated. The record n is updated by writing.

Next, the second SIO issued by the host
Write operation type and seek value for disk (seek cylinder, seek head) /
Since the set sector value and the search value for the record m (search cylinder, search head, record count value) are notified, a seek command is issued to move the disk arm to the physical position indicated by the seek value. To do.

Then, the record m having the search value notified from the host is searched to search the record m. When the positioning to the record m is completed by this search process, the update data sent from the host is updated. The record m is updated by writing.

As described above, in the conventional magnetic disk control device, when the records to be accessed are continuous, the record is positioned at the top record, and when the records to be accessed are not continuous, each record is accessed. It had the structure of positioning it on the record.

[0012]

However, as in the conventional case, the records that are originally desired to be collectively accessed are set to SI
If O is separated to realize the access, in most cases there is a problem that the record cannot be accessed at high speed because of waiting for rotation.

That is, from time t5 to time t in FIG.
If the elapsed time up to 6 becomes long, the search processing of the record m performed at the time t6 does not enter the same rotation where the access of the record n is made, so that one rotation waiting is caused.

This problem is a very serious problem because it always occurs when a record that has not been used up to that time is newly used. In other words, the record located at the beginning of a track has a configuration that manages the number of unused records located at that track. Therefore, if you try to use a record that has not been used until then, the first record will also be recorded. It is necessary to update them at the same time, and as a result, as shown in FIG. 17, SIO must be issued twice, and this problem is encountered.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a new disk control device which realizes high speed access when accessing discontinuous records managed by a disk. To do.

[0016]

1 and 2 show the principle configuration of the present invention. In the figure, 10 is a disk control device having the present invention, 11 is a host which issues an access request, and 12 is a disk which stores records.

The disk controller 10 whose principle configuration is shown in FIG. 1 comprises a receiving means 20, a judging means 21, a seek command issuing means 22, a search executing means 23, and an access executing means 24.

The receiving means 20 receives the SIO issued by the host 11. The judging means 21 is provided in the receiving means 20, for example, and judges the access command type according to the operation type of the received SIO. The seek command issuing means 22 specifies the seek value of the received SIO and issues a seek command to the disk 12. The search execution means 23 includes a first search execution means 230 for performing a search process for a record indicated by the received SIO search value and a second search execution means for performing a search process for a specific record indirectly indicated by the received SIO search value. The search execution means 231 is provided. The access executing means 24 executes a reading process and an updating process of the record of the disk 12.

The disk controller 10 whose principle configuration is shown in FIG. 2 includes a receiving means 20, a judging means 21, a controlling means 25, a seek command issuing means 22, and a search executing means 2.
3 and access execution means 24.

The receiving means 20 receives the SIO issued by the host 11. The judging means 21 is provided in the receiving means 20, for example, and judges the access command type according to the operation type of the received SIO. Control means 25
Is provided in, for example, the receiving unit 20, and receives the SIO.
The control processing of the search information issued in association with is executed. The seek command issuing means 22 issues a seek command to the disk 12 in response to an instruction from the control means 25. The search execution means 23, in response to an instruction from the control means 25, performs a record search process. The access executing means 24 executes a reading process and an updating process of the record of the disk 12.

[0021]

In the disk controller 10 of the present invention, the principle configuration of which is shown in FIG.
When O is received, the judging means 21 judges whether or not the access command is the continuous simultaneous access command according to the operation type of the received SIO, and when it is judged that the access command is the continuous simultaneous access command, the seek command is issued. Means 2
2 specifies the seek value of the received SIO and issues a seek command to set the physical position of the arm of the disk 12 to the position indicated by the seek value.

Then, the second search executing means 231
From the received search value of the SIO, the search value of the specific record (for example, the first record) located on the same track as the record indicated by the search value is specified, and the search process of the record having the specified search value is performed. , The logical position of the arm of the disk 12 is positioned at the specific record, and when this positioning is completed, the access execution means 24 executes the access processing to the specific record.

Subsequently, the first search executing means 230
By performing the search process of the record having the received SIO search value, the logical position of the arm of the disk 12 is positioned at the record pointed to by the search value, and when this positioning is completed, the access execution means 24 moves to that record. The access process of is executed. At this time, when the continuous simultaneous access command specifies the number of processing records, the access executing means 24 continuously accesses the records corresponding to the number of processing records, following the record indicated by the search value.

As described above, according to the present invention whose principle configuration is shown in FIG. 1, two non-consecutive records located on the same track can be continuously accessed by one SIO. High-speed access can be realized.

In the disk controller 10 of the present invention whose principle configuration is shown in FIG. 2, when the receiving means 20 receives the SIO from the host 11, the judging means 21 receives the received SIO.
It is determined whether or not the access instruction is the discrete simultaneous access instruction according to the operation type, and when it is determined that the access instruction is the discrete simultaneous access instruction, the receiving unit 20
Search information (which may include a seek value) specifying search values for a plurality of non-consecutive records issued in association with SIO is received.

Receiving the SIO / search information, the control means 25 sequentially requests the seek value designated by the SIO / search information on condition that the access processing by the access execution means 24 is completed. And the search value designated by the search information in order to the search execution means 23.

Upon receiving this notification, the seek command issuing means 2
When the seek cylinder value in the seek value is different from that of the previous notification, the seek value is issued by designating the seek value to be notified, and the seek position indicates the physical position of the arm of the disk 12. The search execution means 23 performs the search process of the record having the notified search value, after setting the position, and issuing the seek command.
The logical position of the arm of the disk 12 is positioned at the record pointed to by the search value, and when this positioning is completed, the access execution means 24 executes the access processing to that record. At this time, when the search information specifies the number of processing records in association with the search value, the access executing means 24 continuously accesses the records for the number of processing records, following the record indicated by the search value. I will go.

Then, the seek command issuing means 22 / search executing means 23 repeatedly execute this processing for all the search values included in the search information. As described above, in the present invention whose principle configuration is shown in FIG. 2, a plurality of non-consecutive records can be continuously accessed by one SIO, so that high-speed access of records can be realized. .

[0029]

EXAMPLES The present invention will be described in detail below with reference to examples. FIG. 3 illustrates a system configuration example of the computer system.

As shown in this figure, the computer system is
Usually, it is composed of a CPU 30, a main storage device 31, a main storage control device 32, a DASD 33, an asynchronous transfer type magnetic disk control device 34, and a channel device 35.

The present invention is applied to the asynchronous transfer type magnetic disk controller 34 and the synchronous transfer type magnetic disk controller provided in place of the asynchronous transfer type magnetic disk controller 34.

First, the present invention whose principle configuration is shown in FIG. 1 will be described in detail according to an embodiment. The present invention whose principle configuration is illustrated in FIG. 1 provides a configuration in which two non-consecutive records located on the same track can be continuously accessed by one SIO.
As shown in, the first record 0 located on the same track
And record n (n ≠ 0,1) can be continuously updated during the same rotation of the disk.

In order to realize the continuous updating of the record 0 and the record n, the present invention defines a new continuous simultaneous access instruction, and when this continuous simultaneous access instruction is issued, as shown in FIG. , SIO locate record LR has an operation type indicating that it is a continuous simultaneous access instruction, a seek value (seek cylinder, seek head) / set sector value for DASD 33, and a search value (search cylinder, search head) for record n. , Record count value).

FIG. 6 shows an embodiment of the processing flow of the asynchronous transfer type magnetic disk control device 34 of the present invention executed when this continuous simultaneous access instruction is defined. Next, one embodiment of the present invention whose principle configuration is illustrated in FIG. 1 will be described in detail according to this processing flow.

When the asynchronous transfer type magnetic disk controller 34 of the present invention receives the SIO from the CPU 30, as shown in the processing flow of FIG.
From the operation type of the SIO, it is determined whether or not the access instruction is the above continuous simultaneous access instruction. If it is determined in step 1 that the access instruction is a continuous simultaneous access instruction, the process proceeds to step 2,
By issuing a seek command with the SIO seek value specified, the physical position of the arm of the DASD 33 is set to the position indicated by the seek value.

Then, in step 3, the search value of the first record 0 of the track pointed to by the search value is specified from the SIO search value, and the search command is issued by specifying the specified search value to execute the search process. By doing, DASD3
The logical position of arm 3 is located at the first record 0 of the same track. That is, the record count value of the SIO search value is changed from “n” to “0”, the converted search value is designated, a search command is issued, and a search process is performed to determine the logical position of the arm of the DASD 33. It is positioned at the first record 0 on the same track.

When this positioning is completed, the update processing of the record 0 is executed by writing the update data of the record 0 sent after the SIO in the following step 4. Then, in step 5, by specifying the SIO search value and issuing a search command to perform search processing, the DAS
The logical position of the arm of D33 is set to the record n designated by the continuous simultaneous access instruction. Then, when this positioning is completed, in the subsequent step 6, the update data of the record n sent following the SIO is written to execute the update process of the record n, and the whole process is ended. At this time, when the continuous simultaneous access command specifies the number of processed records, the record n is continuously updated after the update processing of the record n.

On the other hand, when it is determined in step 1 that the access instruction is not the continuous simultaneous access instruction, the process proceeds to step 7 as in the prior art to issue the seek instruction by designating the seek value of SIO. DASD3 is set by setting the physical position of the arm of DASD 33 to the position pointed to by the seek value, and issuing a search command by designating the search value of SIO in the subsequent step 8.
The logical position of the arm 3 is positioned at the record designated by the access instruction, and when this positioning is completed, the access processing of the positioned record is executed in the following step 9.

By executing the processing flow of FIG. 6 in this manner, the asynchronous transfer type magnetic disk control device 34 of the present invention, as shown in FIG. The designated record n and the record 0 located at the beginning of the same track as the record n can be updated simultaneously and within the same rotation.

Next, according to the processing of the channel adapter 1 / device adapter 2 / resource manager 3 / task control block 4 / asynchronous transfer buffer 5 provided in the asynchronous transfer type magnetic disk controller 34 shown in FIG. Will be described in more detail.

When the channel adapter 1 receives the SIO of the continuous simultaneous access instruction from the host, it writes the locate record LR of the SIO to the task control block 4. According to this processing, the task control block 4 is written with the operation type indicating the continuous simultaneous access instruction, the seek value / set sector value for the DASD 33, and the search value for the record n.

Subsequently, the channel adapter 1 responds to the fact that the continuous simultaneous access instruction is an update instruction for two records, so that the buffer 5 for asynchronous transfer has "2" as the number of records processed by the channel adapter 1. , “2” is written as the number of processing records of the device adapter 2.
Subsequently, the channel adapter 1 instructs the resource manager 3 to activate the device adapter 2 in order to instruct the issuance of the seek instruction. Subsequently, the channel adapter 1 receives the update data of the record 0 sent after the SIO and writes it in the asynchronous transfer buffer 5.

Subsequently, the resource manager 3 activates the device adapter 2 in response to the instruction from the channel adapter 1. Subsequently, the device adapter 2 reads and recognizes the contents of the task control block 4, issues a seek command by designating the read seek value, and when the issuance is completed, it notifies the resource manager 3 to that effect. Notify and enter the idle state.

Next, when the channel adapter 1 writes the update data of the record 0 into the buffer 5 for asynchronous transfer, the resource manager 3 activates the device adapter 2 to instruct the update of the record 0. Give instructions. At this time, the channel adapter 1 decrements the processing record number of the channel adapter 1 stored in the asynchronous transfer buffer 5 by 1 in response to the end of writing the record 0 into the asynchronous transfer buffer 5, and decrements the number to “1”. To Subsequently, the resource manager 3 activates the device adapter 2 in response to the instruction from the channel adapter 1.

Subsequently, the device adapter 2 reads and recognizes the contents of the task control block 4. Then, the number of processing records of the channel adapter 1 stored in the asynchronous transfer buffer 5 and the number of processing records of the device adapter 2 are compared, and the former is smaller than the latter, so that the DASD 33 can be written. When it is recognized that it is, a search command is issued to position it at record 0. Subsequently, when the positioning of the record 0 is completed, the device adapter 2 causes the asynchronous transfer buffer 5
Read the update data of record 0 from and write it in the data part of record 0.

Subsequently, the channel adapter 1 receives the update data of the record n sent after the update data of the record 0 while the record 0 of the device adapter 2 is being updated, and receives this update data of the asynchronous transfer buffer 5 Write in. At this time, the channel adapter 1 responds to the end of writing the record n into the asynchronous transfer buffer 5,
When the number of processing records of the channel adapter 1 stored in the asynchronous transfer buffer 5 is decremented to "0" and the processing is completed, the resource manager 3 is notified and the idle state is entered.

Subsequently, when the update of the record 0 is completed, the device adapter 2 decrements the number of processing records of the device adapter 2 stored in the asynchronous transfer buffer 5 by 1 to "1". Then, the contents of the task control block 4 are read and recognized, the number of processing records of the channel adapter 1 stored in the asynchronous transfer buffer 5 is compared with the number of processing records of the device adapter 2, and the former one is the latter one. Smaller than, DAS
When it recognizes that writing to D33 is possible, it issues a search command this time to position it at record n.

Subsequently, when the positioning of the record n is completed, the device adapter 2 reads the update data of the record n from the asynchronous transfer buffer 5, writes it in the data part of the record n, and when the processing is completed, Device adapter 2 stored in the asynchronous transfer buffer 5
Decrement the number of processed records by 1 to "0". Then, when the processing is completed, the resource manager 3 is notified of that fact, and the idle state is entered.

Subsequently, the resource manager 3 activates the channel adapter 1 to notify the host of the end of processing. Then, the channel adapter 1 receives this and notifies the host of the end of the process. When the process is completed, the channel adapter 1 notifies the resource manager 3 of that fact and enters the idle state.

Next, the present invention whose principle configuration is shown in FIG. 2 will be described in detail according to an embodiment. The present invention whose principle configuration is illustrated in FIG. 2 provides a configuration in which a plurality of non-consecutive records can be successively accessed by one SIO.

In order to realize the access processing of the plurality of non-consecutive records, the present invention defines a new discrete simultaneous access instruction, and when the discrete simultaneous access instruction is issued, the locate record LR of the SIO is issued. To
The operation type indicating the discrete simultaneous access instruction and the seek value for the DASD 33 (seek cylinder,
Seek head) / set sector value and the number of discrete record groups are requested, and the search value for each access target record ( (Search cylinder, search head, record count value) and the number of processing records to be continuously processed from the access target record is requested to be issued.

For example, the search cylinder "0001", the search head "0001", two consecutive records starting from the record count value "3", and the search cylinder "00"
When 01 "is accessed by the search head" 0002 "and one record starting from the record count value" 2 ", issuance of search information as shown in FIG. 9 is requested.

FIG. 10 shows an embodiment of the processing flow of the asynchronous transfer type magnetic disk controller 34 of the present invention executed when this discrete simultaneous access instruction is defined.
Next, one embodiment of the present invention whose principle configuration is shown in FIG. 2 will be described in detail according to this processing flow.

When the asynchronous transfer type magnetic disk controller 34 of the present invention receives the SIO from the CPU 30, FIG.
First, as shown in the processing flow of FIG.
Then, it is determined from the operation type of the SIO whether or not the access instruction is the above-mentioned discrete simultaneous access instruction. When it is determined in this step 1 that the access instruction is the discrete simultaneous access instruction, the process proceeds to step 2 to receive the search information having the format of FIG. 8 sent subsequently to the SIO.

Then, in step 3, the seek value of SIO is designated and a seek instruction is issued, so that DASD 33 is generated.
The physical position of the arm of is set to the position indicated by the seek value. Then, in step 4, it is determined whether or not the processing for the number of discrete record groups notified by the SIO has been completed, and when it is determined that the processing has been completed, all the processing is completed. On the other hand, when it is determined that the search is not completed, the process proceeds to step 5, and the search value following the search value for which the previous processing has been completed is extracted from the received search information.

Subsequently, at step 6, the search value fetched at step 5 is designated and a search command is issued to carry out a search process to locate the logical position of the arm of the DASD 33 at the record pointed to by the fetched search value. . Then, when this positioning is completed, in the following step 7, the access processing of the positioned record and the records corresponding to the number of processing records designated by the subsequent search information are executed, and then the process returns to step 4. At this time, in the case of the write access process, the write access process is executed using the update data sent subsequently to the SIO.

On the other hand, when it is determined in step 1 that the access instruction is not the discrete simultaneous access instruction, the process proceeds to step 8 as in the prior art to issue the seek instruction by designating the seek value of SIO. DASD3 is set by setting the physical position of the arm of DASD 33 to the position pointed to by the seek value, and in step 9 that follows, specifies the SIO search value and issues a search command to perform search processing.
The logical position of the arm 3 is positioned at the record designated by the access instruction, and when this positioning is completed, the access processing of the positioned record is executed in the following step 10.

By executing the processing flow of FIG. 10 in this manner, the asynchronous transfer type magnetic disk control device 34 of the present invention, as shown in FIG. You will be able to access consecutive records one after another.

In the embodiment using the search information shown in FIG. 8, high-speed access is possible when the track where the record to be accessed is located is adjacent, but when the tracks are far apart, extra time is required for the search. There is a drawback that it costs. For example, when accessing the record n of the search cylinder “0001” / search head “0001” and the record m of the search cylinder “0001” / search head “0008”, all the heads 2 to 8 are searched. Therefore, the search takes extra time.

Next, an embodiment for solving this problem will be described. In an embodiment that realizes this, when issuing a discrete simultaneous access instruction, the locate record LR of the SIO is requested to specify the operation type indicating the discrete simultaneous access instruction and the number of discrete record groups. In association with the issuance of this discrete simultaneous access instruction, as shown in FIG. 12, a seek value (seek cylinder, seek head) and a search value (search cylinder, search head, record count value) for each access target record , And requests to issue seek search information that specifies the number of processing records to be continuously processed from the access target record.

For example, the search cylinder "0001", the search head "0001", two consecutive records starting from the record count value "3", and the search cylinder "00"
When 01 "is accessed by the search head" 0008 "and one record starting from the record count value" 2 "issuance of search information as shown in FIG. 13 is requested.

FIG. 14 shows an embodiment of the processing flow of the asynchronous transfer type magnetic disk controller 34 of the present invention executed when this discrete simultaneous access instruction is defined.
Next, one embodiment of the present invention whose principle configuration is shown in FIG. 2 will be described in detail according to this processing flow.

When the asynchronous transfer type magnetic disk controller 34 of the present invention receives the SIO from the CPU 30, the asynchronous transfer type magnetic disk controller 34 of FIG.
First, as shown in the processing flow of FIG.
Then, it is determined from the operation type of the SIO whether or not the access instruction is the above-mentioned discrete simultaneous access instruction. If it is determined in step 1 that the access instruction is the discrete simultaneous access instruction, the process proceeds to step 2 to receive the seek search information having the format shown in FIG. 12 and sent subsequently to the SIO.

Subsequently, in step 3, it is judged whether or not the processing for the number of discrete record groups notified by the SIO has been completed, and when the completion is judged, all the processing is completed. On the other hand, when it is determined that the processing has not been completed, the process proceeds to step 4, and the entry following the entry for which the previous processing has been completed is extracted from the received seek search information.

Then, in step 5, it is judged whether or not the seek cylinder value of the entry fetched in step 4 matches the seek cylinder value of the previously fetched entry, and when it is judged that they do not match, DASD33
Since it is necessary to move the arm position of the DASD 33, the process advances to step 6 and the seek value is issued by designating the seek value of the retrieved entry to point the physical position of the arm of the DASD 33 to the seek value. Set to the position.

When the process of step 6 is finished,
When it is determined in step 5 that the seek cylinder values match, in step 7 that follows, the search value held by the entry extracted in step 4 is specified and a search command is issued to perform a search process, thereby logically determining the arm of the DASD 33. Position the record at the record pointed to by the search value. Then, when this positioning is completed, in the following step 8,
After performing the access processing of the positioned record and the records corresponding to the number of processing records designated by the subsequent search information, the process returns to step 3. At this time, in the case of the write access process, the write access process is executed using the update data sent subsequently to the SIO.

On the other hand, when it is determined in step 1 that the access instruction is not the discrete simultaneous access instruction, the process proceeds to step 9 as in the prior art to issue the seek instruction by designating the seek value of SIO. The physical position of the arm of the DASD 33 is set to the position pointed to by the seek value, and in the subsequent step 10, the search value of the SIO is designated and a search command is issued to perform the search process, thereby DASD 33
The logical position of the arm of 33 is positioned at the record designated by the access instruction, and when this positioning is completed, the access processing of the positioned record is executed in the following step 11.

By thus executing the processing flow of FIG. 14, the asynchronous transfer type magnetic disk controller 34 of the present invention successively accesses a plurality of non-consecutive records with one SIO. This will allow you to access them faster even when the tracks on those records are far apart.

Although the illustrated embodiment has been described, the present invention is not limited to this. For example, in the example,
Although the present invention has been disclosed according to the application to the asynchronous transfer type magnetic disk control device, the present invention is not limited to this.

[0070]

As described above, according to the present invention,
When accessing a record on the disk, it becomes possible to access two non-consecutive records located on the same track in succession with one SIO, and with one SIO, multiple non-sequential records can be accessed. Since the continuous records can be continuously accessed, the records can be accessed at high speed.

[Brief description of drawings]

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

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a system configuration diagram of a computer system.

FIG. 4 is an explanatory diagram of an access process realized by the present invention.

FIG. 5 is an example of a locate record of consecutive simultaneous access instructions.

FIG. 6 is an example of a processing flow executed by the present invention.

FIG. 7 is a time chart of the processing of the present invention.

FIG. 8 is an example of search information issued in association with a discrete simultaneous access instruction.

FIG. 9 is an explanatory diagram of search information.

FIG. 10 is an example of a processing flow executed by the present invention.

FIG. 11 is a time chart of the processing of the present invention.

FIG. 12 is an example of seek search information issued in association with a discrete simultaneous access instruction.

FIG. 13 is an explanatory diagram of seek search information.

FIG. 14 is an example of a processing flow executed by the present invention.

FIG. 15 is a device configuration diagram of an asynchronous transfer type magnetic disk control device.

FIG. 16 is an explanatory diagram of a conventional technique.

FIG. 17 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 disk control device 11 host 12 disk 20 receiving means 21 judging means 22 seek command issuing means 23 search executing means 24 access executing means 25 control means 230 first search executing means 231 second search executing means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Takahashi 2-4-19 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Fujitsu Program Giken Co., Ltd. (72) Hiromi Sugawara 2-chome, Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa No. 19 Fujitsu Program Giken Co., Ltd.

Claims (6)

[Claims] 1. A disk control device for executing disk access control, comprising judgment means (21) for judging whether or not the received access command is a continuous simultaneous access command issued by designating a record. When the judging means (21) judges that it is a continuous simultaneous access instruction, the record designated by the continuous simultaneous access instruction and a specific record located on the same track as the record are successively accessed. A disk control device characterized by being controlled as follows. 2. The disk control device according to claim 1, wherein the specific record is located at the head of a track and manages control information of all the records located on the track, and the specific record is included in the specific record. Then, the disk control device is characterized by controlling to access the record designated by the continuous simultaneous access command. 3. The disk control device according to claim 1 or 2, wherein the records specified by the continuous simultaneous access instruction are successively accessed, and records for the number of processing records specified by the continuous simultaneous access instruction are continuously accessed. A disk control device characterized in that it is controlled to move. 4. A disk controller for executing disk access control, wherein whether the received access command is a discrete simultaneous access command issued together with search information designating a plurality of non-consecutive records. A judgment means (21) for judging is provided, and when the judgment means (21) judges that it is a discrete simultaneous access instruction, it controls so as to successively access a plurality of non-consecutive records designated by the search information. A disk control device characterized by: 5. The disk control device according to claim 4, wherein the search information is associated with each record and specifies a seek value required for accessing the record, and is required according to the seek value. The disk control device is characterized in that the seek command is issued in response to the request, and the non-consecutive records designated by the search information are continuously accessed. 6. The disk control device according to claim 4 or 5, wherein the search information is associated with each record, and the number of processing records is designated, and the record designated by the search information is continued. A disk control device, which controls to continuously access the records of the number of the processing records that are continuous to the record.