JP2541791B2 - Sequential seek processing method for MZR type magnetic disk unit - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to MZR (Multi-Zone-Re
cording: Multi-zone recording) Sequential seek processing method for magnetic disk device.

[0002]

2. Description of the Related Art Conventionally, a magnetic disk controller has performed a seek process and a read / write (R) operation on a magnetic disk device.
/ W) processing, a seek (hereinafter referred to as an elevator seek) may be performed in ascending or descending order of the cylinder address of the magnetic disk medium.

Here, a conventional processing method using an elevator seek will be described with reference to the drawings. FIG. 6 is a block diagram of an information processing system including a conventional elevator seek processing method, which includes a user application 1, a basic OS unit 2a of this system, a kernel unit 3 that is the core of the basic OS unit 2a, and a magnetic field. A magnetic disk control driver unit 4a for controlling the disk device and a magnetic disk device 9 are provided.

Further, the magnetic disk control driver section 4a seeks the I / O request acceptance processing 5 for accepting the I / O request from the user application 1 and the physical head of the magnetic disk device in accordance with the I / O request. Elevator seek processing 10 for determining the cylinder address of the disk, and disk I / O issuing processing for performing seek processing and read / write (R / W) processing for the magnetic disk device 9 in accordance with a processing request from the elevator seek processing 10. 8 and.

An example of the operation of the conventional information processing system will be described with reference to the flow charts shown in FIGS. 7, 8 and 9.

First, referring to FIG. 7, first, the file I / O request from the user application 1 is the basic OS.
The magnetic disk control driver unit 4 is notified via the kernel unit 3 of the unit 2a, and the I / O request acceptance processing 5 is executed. The I / O request acceptance processing 5 confirms the legitimacy of the I / O request data length and I / O range (S21).

If the I / O request is illegal (S2
2) At this point, the process ends abnormally (S23). If the requested I / O is correct (S22), it is registered in the I / O waiting queue (S24). The I / O waiting queue is registered in the ascending cylinder address in ascending order, and the I / O request at this time is registered at the final position of the queue.

Next, referring to FIG. 8, the I / O registered at the final position of the I / O queue by the I / O request acceptance processing 5.
The requests are sorted in ascending order of cylinder addresses in the elevator seek process 10. Here, first I
The cylinder address for seeking is calculated from the requested sector number (volume relative) of the / O request (S31).

The calculation formula used for this calculation can be expressed as follows.

Cylinder address = (sector number / spt) / tpc = sector number / spc where spt: sector number / track tpc: track number / cylinder spc: sector number / cylinder.

The parameters used for the calculation in this case are
It is recorded in the memory in advance.

Here, as an example of the calculation of the cylinder address according to the conventional method, for example, the cylinder address of the sector number 400,000 in the sector number 2,000 per cylinder is cylinder address = 400/2000 = 200.

Next, it is confirmed whether or not only this I / O request is registered in the I / O waiting queue (S32).
If only the / O request is registered, the I / O waiting queue remains at the final position and the elevator seek process 10 ends. However, in addition to this I / O request, the I / O
If the O request is queued, the optimum position is searched from the beginning in ascending order of the cylinder address to be accessed,
The I / O requests are rearranged (S33).

All I / O requests connected to the I / O request waiting queue are checked (S34), and if the cylinder address search is completed, elevator seek processing 10 is performed.
Is ended, and if not ended, the process returns to S32.

Subsequently, the elevator seek processing 10 is executed, the rearranged I / O requests are used, and the disk I
The / O issue process 8 is executed. In this case, referring to FIG. 9, in the disk I / O issuing processing 8, the seek processing is executed for the requested magnetic disk device (S41), and subsequently,
Read / write (R /
W) Process is executed (S42). In this disk I / O issuing process 8, all I / Os registered in the I / O request waiting queue are executed and the process is terminated.

[0016]

In the elevator seek processing method for the above-mentioned conventional magnetic disk device, M
When the ZR type magnetic disk device is connected, the following problems occur.

For example, in the conventional method, since all the cylinders of the connected magnetic disk device have the same number of sectors, the cylinder address can be calculated using the number of sectors of one cylinder. However, in the MZR type magnetic disk device, the number of sectors per cylinder is the same within a range called one zone, but the number of sectors per cylinder is different for each zone.

Therefore, even if the cylinder address is calculated as in the conventional method, the cylinder address in which the I / O target sector exists cannot be calculated accurately, and the result of rearranging in ascending order in the elevator seek process is also obtained. It is illegal.

An object of the present invention is to solve the above drawbacks and provide a more efficient and high performance information processing system.

[0020]

SUMMARY OF THE INVENTION The present invention is a processing method for sequentially seeking an ascending or descending cylinder address of a magnetic disk medium to an MZR type magnetic disk apparatus, and controlling the input / output of the magnetic disk apparatus. The magnetic disk control device is provided with a zone-specific cylinder capacity table that stores cylinder information for each zone of the magnetic disk medium of the magnetic disk device in advance, and the cylinder address is calculated from the number of sectors per cylinder that is different for each zone. Is calculated.

[0021]

Next, the present invention will be described with reference to the drawings.

In general, a magnetic disk device adopting the MZR system aims at ensuring the quality of the device, so that the inner track and the outer track of the magnetic disk medium have the same recording density. Therefore, the number of sectors of one track increases as it goes to the outer circumference, and when it is allocated to the outer circumference, a file that does not span multiple tracks or multiple cylinders spans multiple tracks or multiple cylinders by being allocated to the inner radius. It will be.

In the MZR system, as shown in FIG. 3, the magnetic disk device is divided into a plurality of zones (in FIG. 3, zone divisions due to the difference in capacity per cylinder are zone A, zone B, and zone C). In this example, the number of sectors per cylinder is the same in each zone.

An embodiment of the present invention for a disk device adopting the MZR system will be described with reference to the drawings.

FIG. 1 is a block diagram of an information processing system including the elevator seek processing method of the present invention. The present invention
As shown in FIG. 1, a user application 1, a basic OS unit 2 of this system, a kernel unit 3 which is the core of the basic OS unit 2, a magnetic disk control driver unit 4 for controlling a magnetic disk device, and a magnetic disk. And a device 9.

The magnetic disk control driver unit 4 also accepts I / O requests from I / O requests from the user application 1 and a cylinder capacity table for each zone 6 in which cylinder information for each zone is stored.
And an elevator seek process 10 for determining a cylinder address for seeking the physical head of the magnetic disk device according to the I / O request, and a seek process and a read / write process for the magnetic disk device 9 according to the process request from the elevator seek process. Disk R for (R / W) processing
/ O issuance processing 8.

In the configuration of the information processing system of the present invention, the zone-specific cylinder capacity table 6 storing the cylinder information for each zone is added to the magnetic disk control driver unit 4, and the elevator seek processing 7 is changed. Other than that, the configuration is the same as that of the conventional information system.

Here, as an example, the flow chart shown in FIG. 2, the state diagram shown in FIG. 3, the configuration diagram shown in FIG. 4, and FIG.
An elevator seek (sequential seek) processing method for the magnetic disk device of the MZR method of the present invention will be described with reference to the calculation example shown in FIG.

First, a file I / O request is first issued from the user application 1 and passes through the kernel unit 3 of the basic OS unit 2 and the magnetic disk control driver unit 4 to I / O.
Until the execution and termination of the O request reception processing 5, the processing is the same as the processing steps S21 to S24 shown in FIG. 8, which is a conventional processing method, and is omitted to avoid duplication of description.

Next, the I / O request acceptance processing 5 causes I / O.
The I / O requests registered in the final position of the queue are rearranged in the ascending order of cylinder addresses in the elevator seek process 7.

Here, first, the zone-based cylinder capacity table 6 is searched to determine the zone in which the target sector of the I / O request exists (S11). In this case, this is done by comparing the sector range in the configuration diagram shown in FIG. 4 with the requested sector number. The information in the zone-based cylinder capacity table 6 to be used is recorded in advance.

Next, the address of the cylinder in which the requested sector exists is calculated in consideration of the cylinder capacity of the zone existing before the determined target zone (S12).

The procedure is as follows.

Calculate the relative sector number in the zone where the target sector exists Calculate the starting cylinder address of the zone where the target sector exists * Add all the number of cylinders up to the target zone Sector exists in the zone where the target sector exists Calculate the cylinder address in which the target sector exists (relative to the volume) Calculate the cylinder address by referring to FIG. 5 using the zone-specific cylinder capacity table shown in FIG. 4 based on the procedure described above. When obtained, the cylinder address of sector number 400,000 is obtained as follows.

The symbols (1) to (4) in the figure correspond to the above symbols (1) to (5), respectively.

Relative number of sectors in the zone = (sector number)-(number of sectors up to the target zone) = 400,000-300,000 = 100,000 number of starting cylinders of the target zone = 100 (zone A) + 100 (zone B) = 200 zones Relative number of cylinders = (number of relative sectors in zone) / (number of sectors per cylinder) = 100,000 / 3,000 = 33.33 ... ≈ 33 cylinder address = (value of) + (value of) = 200 + 33 = 233 Become.

After the calculation of the cylinder address, the process is the same as the conventional process, and the process steps S13 to S15 shown in FIG. 2 are the same as the conventional process step S3 shown in FIG.
2 to S34, and the processing by the disk I / O issuing processing 8 is the same as the conventional processing step S shown in FIG.
41 and S42, and the description thereof will be omitted to avoid duplication of description.

[0038]

As described above, according to the elevator seek processing method for the MZR type magnetic disk apparatus of the present invention, the I / O target sector which has occurred when the MZR type magnetic disk apparatus is connected. There is no problem that the address of the cylinder in which is present cannot be calculated accurately, and the result of rearranging in ascending order in the elevator seek process is also incorrect.

For example, in the conventional calculation method,
The cylinder address of 400,000 sectors was calculated as 200, but when the calculation method according to the present invention is used when the MZR type magnetic disk device is connected, the cylinder address where the I / O target sector exists is calculated as 233. It
That is, in the conventional method and the calculation method according to the present invention, there is a difference of 33 cylinders in the seek position,
According to the present invention, the correct position can be calculated.

As a result, the elevator seek processing method has the effect of providing an efficient and high-performance information processing system.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an information processing system including an elevator seek processing method of the present invention.

FIG. 2 is a flowchart showing a flow of elevator seek processing according to the present invention.

FIG. 3 is a state diagram showing a zone state in the magnetic disk device according to the present invention.

FIG. 4 is a diagram showing a structure of a cylinder capacity table for each zone of the magnetic disk device according to the present invention.

FIG. 5 is a diagram illustrating an example of calculating a cylinder address according to the present invention.

FIG. 6 is a configuration diagram showing an example of an information processing system including a conventional elevator seek processing method.

FIG. 7 is a flowchart showing a flow of an I / O request acceptance process according to a conventional method.

FIG. 8 is a flowchart showing a flow of an elevator seek process by a conventional method.

FIG. 9 is a flowchart showing a flow of a disk I / O issuing process according to a conventional method.

[Explanation of symbols]

 1 User Application 2, 2a Basic OS Part 3 Kernel Part 4, 4a Magnetic Disk Control Driver Part 5 I / O Request Reception Processing 6 Zone Cylinder Capacity Table 7 Elevator Seek Processing 8 Disk I / O Issue Processing 9 Magnetic Disk Device

Claims (1)

(57) [Claims] 1. A processing method for sequentially seeking to an MZR (Multi-Zone-Recording) type magnetic disk apparatus in ascending or descending order of cylinder addresses of a magnetic disk medium, wherein input / output control of the magnetic disk apparatus is performed. The magnetic disk control device is provided with a zone-specific cylinder capacity table that stores cylinder information for each zone of the magnetic disk medium of the magnetic disk device in advance, and a cylinder address is calculated from the number of sectors per cylinder that is different for each zone. A sequential seek processing method for an MZR magnetic disk device characterized by being calculated.