JP2779329B2 - Control method for storage control system, storage control system, and storage control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control technique for a storage control system, a storage control system, and a storage control device. The present invention relates to a technology that is effective for speeding up access to a device.

[0002]

2. Description of the Related Art For example, in a general-purpose computer system, it is known to use a large magnetic disk device as an external storage device.

In such a magnetic disk drive, a plurality of tracks are provided concentrically on each of a plurality of coaxially fixed and rotating magnetic disks, and each magnetic disk is equidistant from the center of rotation. In a cylinder unit, which is a logical concept formed by connecting a plurality of tracks that can be accessed at relatively high speed only by a head selection operation without performing a seek operation by moving the head in the radial direction of the magnetic disk, It is common to manage data.

As a data recording format for each track, a so-called CKD system is mainly used.

That is, each of a plurality of records stored in a track is constituted by a count section C, a key section K and a data section D arranged at a predetermined gap, and the count section C stores the record. In addition to recording positioning information in the apparatus and management information such as the length of the key portion K and the data portion D, index information for searching the data portion D is recorded in the key portion K, and actual data is recorded in the data portion D. Is stored.

[0006] While the head passes through each gap, preparation for a predetermined process is continuously performed on a part that comes next.

[0007] Recently, as disk drives have become more fixed and larger in capacity, there has been a strong demand for high-speed data transfer from customers, and in response to this, a plurality of tracks are collectively processed (continuous processing). While trying to prevent rotation waiting by processing tracks one track at a time, a dump operation to save data from a magnetic disk to a magnetic tape or the like, or a transfer operation from a magnetic tape to an original magnetic disk or from a magnetic disk to a magnetic disk. In restore processing for restoring data, by selectively dumping / restoring only the updated tracks instead of processing all tracks in its entirety, the processing time is shortened and the number of tape windings is reduced by reducing the amount of data. Tend to be.

For this purpose, it is necessary to collectively process discontinuous tracks on the same cylinder.

For this reason, in the magnetic disk drive adopting the CKD method as described above, tracks are switched within the same cylinder, for example, SEEK H
An EAD command or a command with a multi-track instruction is used.

[0010]

However, the former SE
Since the EK HEAD command needs to receive the individual track number from the upper central processing unit every time it is executed, it cannot be processed in the gap unique to the CKD method, and the read / write head is repositioned by a subsequent read command. It needs to be corrected, and it is impossible to process the next record without waiting for rotation. And this SEEK
The HEAD command needs to be performed before the read command, and there is a problem that the overhead cannot be ignored.

On the other hand, the latter command with a multi-track instruction performs an operation of switching the head at the track start point (index marker) while guaranteeing the position of the read / write head, but always selects the next adjacent track. Therefore, in order to continue processing for a track distant from the current track, the command with the multi-track instruction is issued a plurality of times, and the number of times of issuing the command with the multi-track instruction until the index is reached in order to switch tracks. There is a greater problem that the more the distance between the current track and the next target track, the more the rotation wait occurs.

Accordingly, conventionally, the former SEEK HE
Although the AD command is used, this command has a large overhead as described above. To absorb this overhead at the time of track switching, a large gap is required behind the track, and repositioning of the head is also required.

This is because, in recent years, when a data format that uses almost the entire track is adopted in order to secure the storage capacity of the magnetic disk drive, one time is always required to continuously process non-adjacent tracks. It is inevitable that a wasteful rotation time occurs, which causes an increase in the time required for data transfer between the central processing unit and the magnetic disk device.

As a data recording method for avoiding rotation waiting in a magnetic disk device, for example,
There is a technique disclosed in Japanese Patent Application Laid-Open No. 83967.

That is, in this technique, a position of an index marker of a track is set to be shifted in each of a plurality of cylinders, so that a track of a certain cylinder is
The object of the present invention is to avoid the rotation waiting that occurs during the operation of moving and switching the head to the track of the next cylinder.

However, according to this technique, since the positions of the index markers of the respective tracks in the individual cylinders are the same, there is no effect in avoiding the rotation waiting in the head switching in the same cylinder.

An object of the present invention is to provide a control technique and a storage control system for a storage control system that enables continuous access to a plurality of storage areas at positions separated from each other in a rotary storage device without causing a rotation wait. A control system and a storage control device are provided.

Another object of the present invention is to provide a data recording technique which enables continuous access to a plurality of storage areas located apart from each other in a rotary storage device without causing a rotation wait. is there.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0020]

The following is a brief description of an outline of a typical invention among the inventions disclosed in the present application.

That is, the present invention provides a rotary storage device that performs at least one of writing and reading data to and from a plurality of storage areas provided in a rotary storage medium,
A storage control device that is interposed between the rotary storage device and the host processing device and controls data transfer between the host processing device and the rotary storage device according to a read or write command issued from the host processing device; The storage control device, when receiving information specifying a plurality of storage areas in advance prior to a read or write command from a higher-level processing device, stores the information in storage means. Then, at the time of reading or writing, by referring to the storage means, the rotating storage device is instructed to access the specified storage area.

Further, the present invention provides a rotary storage device for performing at least one of writing and reading of data to and from a plurality of storage areas provided in a rotary storage medium; A storage control device interposed therebetween, and a storage control device for controlling transmission and reception of data between the high-order processing device and the rotary storage device according to a read or write command issued from the high-order processing device; When the storage control device receives an instruction for specifying a plurality of storage areas of the rotary storage device from the host processing device, the storage control device stores information specifying the plurality of storage regions accompanying the instruction in the storage unit, and receives the instruction. At the time of subsequent reading or writing, the information in the storage means is read, and the rotating storage device is accessed so as to access a plurality of storage areas specified by the information. It is intended to instruct.

The present invention also provides a rotary storage device for writing and / or reading data to and from a plurality of storage areas provided on a rotary storage medium, and a rotary storage device and a higher-level processing device. A storage control device interposed between the storage control device and the storage control device for controlling data transfer between the host processing device and the rotary storage device in accordance with a read or write command issued from the host processing device; When information specifying a plurality of storage areas is received in advance prior to a read or write command from a higher-level processing device, the information is stored in a storage unit, and the storage unit is referred to when reading or writing. Thus, the rotary storage device is instructed to access the specified storage area.

According to the present invention, there is provided a rotary storage device for writing and / or reading data to and from a plurality of storage areas provided in a rotary storage medium; A storage control system interposed between the storage control device and a storage control device for controlling data transfer between the host processing device and the rotary storage device in accordance with a read or write command issued from the host processing device. When receiving an instruction specifying a plurality of storage areas of a rotary storage device from a host processing device, stores information specifying a plurality of storage areas accompanying the instruction in a storage unit, and reads out the instruction after receiving the instruction. Alternatively, at the time of writing, the information in the storage unit is read, and the rotating storage device is instructed to access a plurality of storage areas specified by the information. It is obtained by sea urchin configuration.

Further, the present invention intervenes between a higher-level processing device and a rotary-type storage device that performs at least one of writing and reading of data to and from a plurality of storage areas provided in a rotary-type storage medium. In a storage control device that controls the transfer of data between a higher-level processing device and a rotary storage device in accordance with a read or write command issued from a processing device, prior to a read or write command from the higher-level processing device, When information specifying a plurality of storage areas is received, the information is stored in the storage means, and at the time of reading or writing, by referring to the storage means, the rotary storage device is instructed to access the specified storage area. It is configured so that

Further, the present invention intervenes between a higher-level processing device and a rotary-type storage device that performs at least one of writing and reading of data to and from a plurality of storage areas provided in a rotary-type storage medium. A storage controller that controls data transfer between a host processor and a rotary storage device in accordance with a read or write command issued from the processor, and specifies a plurality of storage areas of the rotary storage device from the host processor. When receiving an instruction to execute the instruction, information specifying a plurality of storage areas associated with the instruction is stored in the storage means, and when reading or writing after receiving the instruction,
The information is read from the storage means, and the rotating storage device is instructed to access a plurality of storage areas specified by the information.

According to the data recording method of the present invention, a head is positioned in a plurality of storage areas provided in a rotary storage medium, and at least one of data writing and reading operations on the rotary storage medium via the head is performed. In the rotary storage device, the gap is added to the end or the beginning of the storage area without losing the nominal storage capacity of the individual storage area, and the head corresponding to the individual storage area is switched. The operation of selecting any one of the storage areas is completed while the head passes through the gap.

[0028]

According to the above-described control method, storage control system, and storage control device of the storage control system of the present invention, when a storage area in a rotary storage device is managed in units of tracks, for example, a conventional SEEK is used.
As with the HEAD command, every time a track is switched, redundant operations such as receiving a track number from a host processor are not required, and a plurality of tracks separated from each other in the same cylinder are continuously rotated without waiting for rotation. Can be accessed.

According to the above-described data recording method of the present invention, the gap provided at the leading end or the trailing end of a storage area such as a track can be used, for example, in a conventional SEEK.
Since the switching time of the head to the next storage area arbitrarily distant from the current storage area by the HEAD command is absorbed, rotation waiting occurs in a plurality of storage areas separated from each other in the same cylinder. It can be accessed continuously without any change.

[0030]

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

(Embodiment 1) FIG. 1 is a block diagram showing an example of a system configuration when a storage control system according to an embodiment of the present invention is incorporated in a general-purpose computer system, and FIG. 9 is a flowchart illustrating an example of an operation.

For example, a central processing unit 1 (upper processing unit) of a general-purpose computer is connected via a channel unit 2 (upper processing unit) which controls transmission and reception of data and commands between the central processing unit 1 and the outside. A storage control system including a disk control device 3 (storage control device) and a magnetic disk device 4 (rotary storage device) is connected.

The control of data input / output between the central processing unit 1 and the magnetic disk unit 4 via the channel unit 2 and the disk control unit 3 is controlled by the central processing unit 1 via the channel unit 2. This is performed by the CCW chain 50 composed of a series of channel command words (hereinafter simply referred to as CCWs or commands) issued to the disk controller 3.

That is, the disk control device 3 includes a command decoding unit 31 for analyzing individual commands coming from the channel device 2, a track switching unit 32 activated by a control signal 31 a from the command decoding unit 31,
Similarly, a disk read / write processing unit 33, which is started by a control signal 31b from the command decoding unit 31 and controls data transfer between the magnetic disk device 4 and the channel device 2, is provided.

The disk control device 3 is provided with a track switching map 34 (storage means) having a predetermined bit width.

In this embodiment, in order to make the description easy to understand, the components of the disk control device 3 are divided into a command decoding unit 31, a track switching unit 32, a disk read / write processing unit 33, a track switching map 34 and the like. Although separately illustrated, these functions can be configured by, for example, a general-purpose or dedicated microprocessor, and a program and a memory that control the microprocessor.

In this case, the track switching map 34 is configured to hold bit information 34a corresponding to the number of tracks for one cylinder in the magnetic disk drive 4.

That is, the magnetic disk device 4 in this embodiment is provided with eight magnetic disks (not shown) whose both sides are recording surfaces, except for the surface on which servo information for controlling the positioning of the head is recorded. Of each recording surface, one cylinder is constituted by 15 tracks equidistant from the center of rotation.
Track numbers up to #E are assigned, and bit information 34a corresponding to each of them is held in the track switching map 34.

In the track switching map 34, a DEFINE TRACK SELECT, which will be described later, is used.
When the control signal 31c sent from the command decoding unit 31 when the T command 51 arrives, the DEF
An operation is performed in which the bit information 34a of the track number #n corresponding to a plurality of tracks to be accessed, designated as parameters accompanying the INE TRACK SELECT command 51, is set to "1" and the others are set to "0". .

The track switching map 34 is connected to the track switching section 32 via a signal line 35.
Operation for instructing the magnetic disk device 4 to switch a head (not shown) to the magnetic disk device 4 without performing a redundant operation of receiving a track number from the higher-order channel device 2 every time the track is switched based on the bit information 34a in 4. Is what you do.

FIG. 3 is a diagram showing an example of the CCW chain 50 used in this embodiment.

First, DEFINE TRACK SEL
The ECT command 51 is a command peculiar to the present embodiment.
As described above, the bit information corresponding to the track number #n corresponding to the track switching map 34 provided in the disk control device 3 is held by setting the bit information to "1".

The SEEK command 52 is a command for performing a seek operation for positioning the head at a target cylinder by moving the head in the radial direction of a magnetic disk as a storage medium.

Further, a SEARCH ID command 53
Is a command for positioning the head at the target record in the track. That is, CK like this embodiment is used.
In the recording method of the D method, the operation of reading the count portion of each record and checking whether or not the record is the target record based on identification information such as a cylinder number, a track number, and a record number recorded in the count portion is performed. Is what you do.

The TIC command 54 is for performing a conditional branch operation in the CCW chain in the CCW chain 50 in accordance with the end condition of the immediately preceding command. In the case of this embodiment, the preceding SEARCH
SEARCH again when ID command 53 fails
An operation for performing the ID command 53 is performed.

Further, a READ MCKD command 55
Is a command for reading out all records from the current head position on an arbitrary track.

The MSEARCH ID command 56
Is a SEARCH ID command with a multi-track instruction.

That is, the MSEARCH ID command 56 is usually used for each track 6 shown in FIG.
At the same time as detecting the index marker 6a indicating the start end (end) of the (storage area), the track switching operation from the current track 6 to the adjacent track 6 is automatically performed.

An example of the operation of the storage control system and the control method according to the present embodiment will be described below.

First, from the central processing unit 1 to the channel unit 2
When the DEFINE TRACKSELECT command 51 is issued via the command, the command decoding unit 31 of the disk controller 3 decodes this command, sends out the control signal 31c, and activates the track switching map 34. With this as an opportunity, the DEFINE TRACKSEL
Information on a combination of a plurality of tracks 6 specified as a parameter accompanying the ECT command 51 is set in individual bit information 34 a of the track switching map 34.

Next, the head is positioned at a target cylinder in the magnetic disk drive 4 by the SEEK command 52.

Further, a SEARCH ID command 53
An operation for searching for the target record R _n in the target track 6 is performed by the TIC command 54. This search operation is repeated until the target record is found, and after the target record is found, the search operation is repeated. , Followed by REA
According to the DMCKD command 55, an operation of reading all the records in the current track up to the end of the track after the current record is performed, and the read record is transmitted to the channel device 2 via the disk read / write processing unit 33. Sent to the side.

Further, MSEARCH ID command 5
6 receives the control signal 31a.
The track switching unit 32 and the track switching map 34 are activated through the steps 31b and 31b.

Thus, the track switching section 32 refers to the bit information of the track switching map 34 and knows the track number #n of the next track to be switched.

Then, the track switching unit 32 determines which corresponding head is to be selected based on the track number #n taken from the track switching map 34.

The head number matches the track number in the cylinder. For example, in the case of this embodiment, if the track corresponding to the currently selected head is track number # 1, the track switching map 34 Since the next bit information 34a of "1" corresponds to the track number # 4, the head corresponding to the track number # 4 to be processed next from the current track number # 1 is selected.

At the same time, the track switching section 32 searches the track switching map 9 for a head (track) to be processed after the currently selected head (track).

This operation is automatically performed when the index marker 4a is detected during the execution of the MSEARCH ID command 56, regardless of whether the bit of the track number #n corresponding to the currently selected head is "1" or "0". Be executed.

At this time, DEFINE TRACK was previously
If the SELECT command 51 has not been issued,
As before, the next track number # n + adjacent to the track with the track number #n corresponding to the currently selected head
The head of one track is selected.

On the other hand, DEFINE TRACK
If the SELECT command 51 has been issued,
The next head corresponding to the next target track number #n is obtained by referring to the track switching map 34, and the track switching unit 32 instructs the magnetic disk device to select the head.

Here, the head selecting operation performed by the track switching unit 32 with reference to the track switching map 34 is performed by the conventional MSEARCH ID command 56 no matter how far the corresponding track is within the current cylinder. The operation and the processing time for selecting the head corresponding to the track adjacent to this track are the same.

Thus, the conventional MSEARCH ID
Similarly to selecting a head corresponding to a continuous track by the command 56, a head corresponding to a track at an arbitrary position distant from the current track can be selected in the same cylinder. This eliminates the need to wait for rotation each time a track is switched, for example, when continuously accessing tracks at discrete positions.

As a result, the time required to transfer data such as records between the central processing unit 1 and the magnetic disk device 4 is reduced, and the performance of the storage control system is improved.

This will be described with reference to the flowchart of FIG. 2. First, DEFINE TRACK SELE
After the execution of the CT command 51 (step 701), the target processing is performed on the record (step 702).

Next, it is determined whether or not the command is the MSEARCH ID command 56 which is a command with a multi-track instruction (step 703).
It is checked whether the EFINE TRACK SELECT command 51 has been executed (step 704).

Then, if executed, the corresponding DE
The track switching map 34 is already set by the parameter accompanying the FINE TRACK SELECT command 51.
The track number #n (head number) to be processed next is determined with reference to the bit information 34a set in the first row, and the head corresponding to the track with the track number #n is selected (step 705).

On the other hand, the MSEARCH ID command 56
If the DEFINE TRACKSELECT command 51 has not been executed before the MSEARCH I
The operation of the D command 56 is the same as the conventional one, and the head corresponding to the adjacent track obtained by adding 1 to the current track number #n is selected (step 706).

Thereafter, the MSEARCH ID command 5
6 is executed (step 707).

Thus, the CCW chain 5 of this embodiment is
0, for example, if the current track is track number # 1, as shown in FIG.
When the index marker 4a is detected when the SEARCH ID command 56 is executed, the head corresponding to the track of the track number # 4 to be processed next is automatically selected.

As a result, in the same cylinder,
It is possible to continuously process a plurality of tracks at discontinuous discrete positions without waiting for rotation.

For this reason, for example, the magnetic disk drive 4
Even if a continuous access request is made to a group of tracks at a distant position in the medium as in the case of a differential dump of the medium, a high-speed differential processing can be performed without increasing the processing time due to the rotation wait. Dump is possible.

(Embodiment 2) FIG. 5 is a conceptual diagram of a track 8 showing an example of a data recording method according to an embodiment of the present invention. FIG. 6 is a diagram showing a conventional CCW chain composed of a well-known CCW. FIG.

That is, the conventional CCW chain 9
As a method of avoiding the rotation lag that has been inevitable in the past when switching between tracks 8 apart from each other without changing 0, a small-capacity gap that does not perform any processing is provided at the rear end of the track 8. Can be considered.

However, in the method of simply providing a gap,
There is a problem that the data recording area is subjected to wrinkles, and the predetermined nominal storage capacity in one track 8 is reduced.

Therefore, in the case of the present embodiment, the storage capacity in the track 8 is maintained at a predetermined nominal value by slightly increasing the bit density.

That is, in a typical apparatus currently in operation, the rotation time of the magnetic disk is 3600 rpm, and the time required for one rotation is 16.7 ms, and the time required for head switching is about 100 μs. In this example, the bit density is increased by 0.6% in order to form a gap G corresponding to a head transit time of slightly more than 100 μs.

It is to be noted that increasing the bit density by about 0.6% can be easily realized with the current state of the art.

FIG. 5 is a conceptual diagram in which a gap G is provided at the end of each track 8 by increasing the bit density by about 0.6% in this way.

That is, in FIG.
The size of the gap G provided on the trailing side of the SEEK HEK after the processing for all the records R in the track 8 is completed without waiting for rotation.
The time required for selecting any other track 8 (head) by the AD command 62 is covered.

Thus, for example, in the conventional CCW chain 90 shown in FIG. 6, after an arbitrary track #n is executed by the READ MCKD 61 for processing all records R after the designated record R in one track 8, , The head position 8b is the head of the incoming gap G.

Then, a switching operation to an arbitrary track 8 by the SEEK HEAD 92 is performed in the gap G, and this switching operation ends before reaching the index marker 8a in the track 8 concerned.

That is, the head position 8c immediately after the switching operation is located before the index marker 8a.

As a result, a plurality of tracks 8 at discrete positions in the same cylinder are
By using the ARCH ID 93, continuous access can be performed without waiting for rotation.

This is the same in the write operation.

It is needless to say that the same effect can be obtained by arranging the gap G immediately after the index marker 8a on the track 8, that is, at the start end of the track 8.

Although the invention made by the inventor has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be variously modified without departing from the gist thereof. Needless to say.

[0087]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

That is, according to the control method of the storage control system of the present invention, it is possible to realize continuous access to a plurality of storage areas at positions separated from each other in a rotary storage device without causing a rotation wait. Can be obtained.

Further, according to the storage control system of the present invention, it is possible to realize continuous access to a plurality of storage areas at positions separated from each other in a rotary storage device without waiting for rotation. The effect is obtained.

Further, according to the storage control device of the present invention, it is possible to realize continuous access to a plurality of storage areas at positions separated from each other in a rotary storage device without causing a rotation wait. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a system configuration when a storage control system according to an embodiment of the present invention is incorporated in a general-purpose computer system.

FIG. 2 is a flowchart showing an example of the operation of the storage control system according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating a storage control system according to an embodiment of the present invention;
It is a figure showing an example of a CW chain.

FIG. 4 is a conceptual diagram of a track in which records are stored in a rotary storage device in a storage control system according to an embodiment of the present invention.

FIG. 5 is a conceptual diagram of a track in a data recording method according to an embodiment of the present invention.

FIG. 6 is a diagram showing an example of a conventional CCW chain.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Central processing unit (upper processing unit), 2 ... Channel apparatus (upper processing unit), 3 ... Disk controller (storage controller), 31 ... Command decoding part, 31a, 31b, 31c
... Control signal, 32 ... Track switching unit, 33 ... Disk read / write processing unit, 34 ... Track switching map (storage means), 34a ... Bit information, 35 ... Signal line, 4 ... Magnetic disk device (Rotary storage device) , 4a: Index marker, 50: CCW chain, 51: DEFINE
TRACK SELECT command, 6: track (storage area), 6a: index marker, 701 to 707
... Processing step, 8 track, 8a index marker, 8b, 8c head position, G gap, 90
CCW chain, R ... record.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tohoku Kashima 2880 Kozu, Kozuhara, Odawara-shi, Kanagawa Prefecture Inside the Odawara Plant, Hitachi, Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 3/06

Claims (6)

(57) [Claims] 1. A rotating storage device for writing and / or reading data to and from a plurality of storage areas provided on a rotating storage medium, and an intervening device between the rotating storage device and a host processor. And a storage control system comprising: a storage control device that controls transmission and reception of data between the host processing device and the rotary storage device according to a read or write command issued from the host processing device. The storage control device, prior to a read or write command from the higher-level processing device, when receiving information that specifies a plurality of storage areas in advance, stores the information in storage means, and when reading or writing, Instructing the rotary storage device to access the specified storage area by referring to storage means; Control method of a storage control system according to claim. 2. A rotary storage device for writing and / or reading data to and from a plurality of storage areas provided in a rotary storage medium, and an intervening device between the rotary storage device and a host processor. And a storage control system comprising: a storage control device that controls transmission and reception of data between the host processing device and the rotary storage device according to a read or write command issued from the host processing device. When the storage control device receives an instruction to specify a plurality of storage areas of the rotary storage device from the host processing device, stores information specifying a plurality of storage areas accompanying the instruction in storage means, Upon reading or writing after receiving the command, the information is read from the storage means, and a plurality of storage areas specified by the information are read. Control method of a storage control system, characterized by instructing the rotary type storage device so as to process. 3. A rotary storage device for writing and / or reading data to and from a plurality of storage areas provided on a rotary storage medium, and interposed between the rotary storage device and a host processor. A storage control system having a storage control device that controls data transfer between the high-level processing device and the rotary storage device in accordance with a read or write command issued from the high-level processing device; The apparatus, when receiving information specifying a plurality of storage areas in advance prior to a read or write command from the higher-level processing apparatus, stores the information in a storage means, and reads or writes the information in the storage means. By referring to the storage device, the storage device is configured to instruct the rotary storage device to access the specified storage area. Storage control system, characterized in that there. 4. A rotary storage device for writing and / or reading data to and from a plurality of storage areas provided on a rotary storage medium, and interposed between the rotary storage device and a host processor. A storage control system configured to control transmission and reception of data between the host processor and the rotary storage device in accordance with a read or write command issued from the host processor; The apparatus, when receiving an instruction for specifying a plurality of storage areas of the rotary storage device from the host processing apparatus, stores information specifying a plurality of storage areas accompanying the instruction in a storage unit, and stores the information of the instruction. Upon reading or writing after receipt, the information is read from the storage means and a plurality of storage areas specified by the information are accessed. Storage control system, characterized in that it is configured to instruct the power sale the rotary type storage device. 5. A high-level processing device interposed between a high-level processing device and a rotary-type storage device that performs at least one of writing and reading of data to and from a plurality of storage areas provided in a rotary-type storage medium. A storage control device for controlling data transfer between the host processor and the rotary storage device in accordance with a read or write command issued, wherein a read or write command from the host processor is provided in advance. When information specifying a plurality of storage areas is received, the information is stored in storage means, and when reading or writing, the rotation type storage is accessed so as to access the specified storage area by referring to the storage means. A storage control device configured to instruct the device. 6. A high-level processing device interposed between a high-level processing device and a rotary storage device that performs at least one of writing and reading of data to and from a plurality of storage areas provided on a rotary storage medium. A storage control device that controls data transfer between the host processor and the rotary storage device in accordance with a read or write command issued, wherein a plurality of storage areas of the rotary storage device are read from the host processor. When receiving the instruction to specify, information specifying a plurality of storage areas associated with the instruction is stored in the storage means,
When reading or writing after receiving the command, the information is read from the storage unit, and the rotary storage device is instructed to access a plurality of storage areas specified by the information. Characteristic storage control device.