KR101460452B1 - Apparatus of generating snapshot image based on hibernation and method of the same - Google Patents

Abstract

The present invention relates to a technical idea for ensuring consistency of a file system when a hibernation-based snapshot image is created in a computing system, and more particularly, to a partition management apparatus for allocating a partition for isolating a non-closeable file, And a file management unit for unmounting one partition.

Description

[0001] APPARATUS OF GENERATING SNAPSHOT IMAGE BASED ON HIBERNATION AND METHOD OF THE SAME [0002]

The present invention relates to a technical idea capable of ensuring consistency of a file system when a hibernation-based snapshot image is created in a computing system.

In a computer file system, a snapshot is a collection of computer files and directories that contains information about the state of the system at a previous point in time.

Generally, full backups of large amounts of data can take a long time. Also, in a multi-tasking system or a system in which multiple users are used together, the data may be recorded during backup, which may result in data corruption.

A safe way to back up data is to temporarily disable data write access by using the lock API (application program interface) provided by the operating system to stop access to the application during backup or to force read access to the exception. In this case, there are no major problems with unavailable systems, such as desktop computers or small workgroup servers, but high-performance systems can not afford to stop service.

To avoid system crashes, high-performance systems can perform backups based on snapshot images.

Such a snapshot technique has recently been used for booting a mobile terminal or the like as a device requiring fast processing performance.

The hibernation technique provides a function to automatically save the work that has been executed up to the present time, such as a hard disk drive (HDD), at the same time the power of the computing system is turned off.

In a normal power saving mode, a certain amount of power is consumed to maintain the data, and when the power saving mode is left for a long time, the recovery to the previous state may occur due to the loss of data.

However, according to the hibernation technique, a state of a computing system or a snapshot image of data can be generated and then the power can be completely shut off, which is advantageous from the viewpoint of power, and data loss is very small.

Such a hibernation technique may be related to technologies such as a hibernation mode in an OS (Operating System) of Microsoft, and a sleeping in an OS of an Apple company.

Meanwhile, conventionally, an image is generated and stored at the end of a computing system, resulting in a long end time, or an image can not be generated at the end of a sudden shutdown. Furthermore, a snapshot is created at a certain point in time, there was.

In addition, there is a method of using a stable single snapshot image after the initial boot, which is proposed to improve this point, but pointed out that the system state change after the image creation time is lost.

Accordingly, there is a need for a technique that can efficiently and quickly create a snapshot image while maintaining the stability of the system, thereby providing a quick and stable boot.

The apparatus for generating a hibernation based snapshot image according to an embodiment may include a partition management unit for allocating a partition for isolating a non-closeable file, and a file management unit for unmounting at least one partition excluding the allocated partition.

The partition management unit may allocate a first partition including the non-closeable file, a second partition for isolating the non-closeable file, and a third partition, which is a mirror partition of the second partition, according to one embodiment.

The file manager according to an exemplary embodiment may isolate the non-closeable file of the first partition by moving the file to the second partition.

The file manager according to an embodiment may mirror the non-closeable file of the second partition to the third partition.

The file management unit according to an embodiment may unmount the first partition and the third partition.

The apparatus for generating a hibernation-based snapshot image according to an exemplary embodiment may further include an image generating unit for generating a snapshot image of the computing system after unmounting the at least one partition.

The apparatus for generating a hibernation based snapshot image according to an embodiment may further include an image generating unit for generating a snapshot image of the computing system after unmounting the first partition and the third partition.

The image generation unit may generate the snapshot image without unmounting the second partition.

The file management unit according to an embodiment may manage a file so that a mirrored copy of the non-closeable file exists in the third partition.

The hibernation-based snapshot image creating apparatus according to an embodiment of the present invention restores the first partition and the third partition using the snapshot image by using the snapshot image, restores the first partition and the third partition using the snapshot image, And a restoring unit for performing a backward mirroring on the second partition to perform restoration.

The method of generating a hibernation-based snapshot image according to an embodiment may include allocating a partition isolating the non-closeable file, and managing files by unmounting at least one partition excluding the allocated partition .

The step of allocating the partition according to an embodiment may include allocating a first partition including the non-closeable file, a second partition isolating the non-closeable file, and a third partition that is a mirror partition of the second partition Step < / RTI >

The managing of the file according to an embodiment may isolate the non-closable file of the first partition to the second partition and isolate the non-closable file of the second partition to the third partition.

The method of generating a hibernation based snapshot image according to an exemplary embodiment may further include generating a snapshot image after unmounting the at least one partition.

The managing of the file according to an embodiment may include managing the file so that the mirrored copy of the non-closeable file exists in the third partition.

A method of creating a hibernation-based snapshot image according to an exemplary embodiment of the present invention includes restoring the first partition and the third partition using the snapshot image, restoring the snapshot using the snapshot image, And performing reverse mirroring to the second partition to perform restoration.

According to one embodiment, a snapshot image can be efficiently generated while maintaining the stability of the system, and using the snapshot image can provide a fast and stable boot.

According to one embodiment, the non-close file can be stably accessed before the snapshot image is created.

1 is a view for explaining a hibernation-based snapshot image generating apparatus according to an embodiment.
FIG. 2 is a flowchart for explaining partition creation and file management according to an embodiment.
3 is a flowchart illustrating a system restoration process according to an embodiment of the present invention.
4 to 6 are exemplary detailed flowcharts for explaining image generation or restoration according to an embodiment.
7 is a flowchart illustrating a method of generating a hibernation-based snapshot image.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terminologies used herein are terms used to properly represent preferred embodiments of the present invention, which may vary depending on the user, the intent of the operator, or the practice of the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification. Like reference symbols in the drawings denote like elements.

FIG. 1 is a diagram for explaining a hibernation-based snapshot image generating apparatus 100 according to an embodiment.

The hibernation-based snapshot image generating apparatus 100 according to an embodiment moves a snapshot image efficiently by moving a file that can not be closed (hereinafter referred to as a non-closeable file) to a preassigned partition, You can create and use it to provide fast and reliable booting.

To this end, the hibernation-based snapshot image generation apparatus 100 according to an embodiment may include a partition management unit 110 and a file management unit 120. [

First, the partition management unit 110 according to one embodiment can allocate a partition for isolating the non-closeable file. Specifically, the partition management unit 110 may allocate the first partition 101, the second partition 102, and the third partition 103. [ At this time, the first partition 101 may include the non-closeable file as a partition to be unmounted. The second partition 102 is for isolation and can isolate the non-closable file and the third partition 103 is for mirroring and includes a mirror partition of the second partition 102 .

Such a partition allocation may be a new partition creation in the redundant disk area. In another embodiment, it may be a process of reallocating a part of an existing partition area.

The file management unit 120 according to an embodiment may unmount at least one partition included in the unmount target. For example, the file management unit 120 can move the non-closeable file of the first partition 101 to the second partition 102 and isolate the non-closeable file from other files. In addition, the file management unit 120 may mirror the non-closeable file of the second partition 102 to the third partition 103, and may unmount the first partition and the third partition when the mirroring is completed.

In this process, the file management unit 120 may leave the file link information in the first partition 101 so that the file management unit 120 can access the file after moving the non-closeable file. Such file link information may be understood as a symbolic link.

After the close disable file is managed, the partition managing unit 110 can unmount the first partition and the third partition. The second partition can not be unmounted because of non-closeable files, so it can remain unmounted without being unmounted.

The hibernation-based snapshot image generation apparatus 100 according to an embodiment may further include an image generation unit 130 that generates a snapshot image of the computing system after unmounting at least one partition.

Specifically, the image generating unit 130 may generate a snapshot image of the computing system after the unmounting of the first partition 101 and the third partition 103. [ In addition, the image generating unit 130 can generate a snapshot image without unmounting the second partition 102, thereby generating a stable snapshot image.

For example, the snapshot image generation of the image generating unit 130 may be performed by a user command or a system setting during system operation, but may be performed at the time of system shutdown in another embodiment.

Meanwhile, the hibernation-based snapshot image generating apparatus 100 according to the embodiment may further include a restoring unit 140. [

That is, when restoring the system using the created snapshot image, the restoring unit 140 may restore the first partition and the third partition using the snapshot image. More specifically, the restoring unit 140 restores the first partition 101 and the third partition 103 using the snapshot image, restoring the snapshot image using the snapshot image, The third partition 103 may be mirrored in the backward direction with the second partition 102 to complete the restoration process.

As a result, the non-close file is also stably accessible through the link information remaining in the first partition 101 before the snapshot image is created.

The file management unit 120 according to an embodiment may generate file link information (symbolic link) for the non-closeable file moved to the second partition 102 in the first partition 101. [

Specifically, the file management unit 120 according to an exemplary embodiment may replace the non-closeable file of the first partition 101 with a symbolic link. In addition, the files moved to the second partition 102 can be accessed through the replaced symbolic link.

In addition, the file management unit 120 according to an embodiment can manage the file so that the mirrored copy of the non-closeable file exists in the third partition 103. [

FIG. 2 is a flowchart for explaining partition creation and file management according to an embodiment.

The entire partition 200 may include a first partition 210, a second partition 220 and a third partition 230 allotted by the partition management unit 110.

At this time, the first partition 210 may include a partition for unmounting or a partition for which a non-closeable file exists.

If File A and File B exist as a non-closable file among the files included in the first partition 210, the file management unit 120 can move the File A and the File B to the second partition 220 have.

The partition management unit 110 may manage the files so that the file A_link and the file B_link, which are symbolic links, exist in the first partition.

The file management unit 120 may mirror the second partition 220 to the third partition 230 to manage the third partition 230 and the second partition 220 to be the same. As an example, mirroring may involve copying a partition.

After the mirroring, the snapshot image may be generated through the suspend process in a state where the third partition 230 and the second partition 220 are in the same state. The image generating unit 130 can unmount only the first partition 210 and the third partition 230 and generate the image without the second partition 220 being unmountable.

3 is a flowchart illustrating a system restoration process according to an embodiment of the present invention.

The entire partition 300 may include a first partition 310, a second partition 320, and a third partition 330 allocated by the partition management unit 110.

If an image is generated according to the process described with reference to FIG. 2, the restoring unit 140 may restore the first partition 310 and the third partition 330 using the generated snapshot image.

The first partition 310 is a partition including the first non-closable file, and the FILE A and FILE B moved to the second partition 320 are accessible through the link of the first partition 310.

The restoring unit 140 performs mirroring of the file A and the file B of the third partition to the second partition 320 and performs normal access to the second partition 320 through the file A_link and the file B_link which are the symbolic links of the first partition 310 Is possible. Therefore, in the restoration process of the first partition 310 and the third partition 330, restoration to the second partition 320 may be in an unstable state, which is neglected because the restoring unit 140 performs the backward mirroring .

During the system operation, the file A and the file B in the third partition 330 are always mirrored in the same manner as the file A and the file B in the second partition 320, It is possible.

4 to 6 are exemplary detailed flowcharts for explaining image generation or restoration according to an embodiment.

First, FIG. 4 illustrates a suspend process for generating a snapshot image.

The hibernation-based snapshot image generation apparatus according to an exemplary embodiment may forcibly terminate the process by a non-system process (step 401) and initialize the value of the mnt register to 1 (step 402). Next, the hibernation-based snapshot image generating apparatus according to the embodiment may determine whether the value of the mnt register is the same as the partition number (step 403), and if it is the same, the system state may be suspended ).

If the value of the mnt register and the partition number are not the same, the hibernation based snapshot image creation device according to one embodiment may unmount the partition (step 406). Next, the hibernation-based snapshot image generating apparatus according to an embodiment determines whether the unmount has been successfully processed (step 407), and if successfully processed, increments the value of the mnt register by 1 and branches to step 403 .

If not successfully processed, the file can be moved to the partition for isolation after opening the file check (step 408). In addition, if the file is moved, a symbolic link can be created in the partition corresponding to the original location (step 409). After creating the symbolic link, the partition can be unmounted after the branching to step 406. [

Next, FIG. 5 illustrates a resume process for reconstruction through the generated snapshot image.

The hibernation-based snapshot image generation apparatus according to an exemplary embodiment resumes the system state (step 501) and initializes the value of the mnt register to 1 (step 502).

Next, the hibernation-based snapshot image generating apparatus according to the embodiment can determine whether the value of the mnt register is the same as the partition number (step 503), and restore the file of the isolated partition in the same case Step 504). At this time, the file of the isolated partition can be restored by using the mirrored file.

If it is determined in step 503 that the value of the mnt register is not the same as the partition number, the partition is mounted (step 506), the value of the mnt register is incremented by 1 (step 505) And the number of the partition are the same.

Next, FIG. 6 illustrates a method of requesting reading and writing of a file to a virtual file system (VFS).

As shown in FIG. 6, the hibernation-based snapshot image generating apparatus according to an exemplary embodiment checks the file location (step 601) and determines whether the location of the identified file is an isolated partition (step 602).

If the location of the identified file is not an isolated partition, the hibernation-based snapshot image creation device according to one embodiment may update the file (step 603). Also, if the location of the identified file is an isolated partition, the hibernation-based snapshot imaging device according to one embodiment may mirror the updated content to an unmountable partition (step 604).

7 is a flowchart illustrating a method of generating a hibernation-based snapshot image.

A method for creating a hibernation-based snapshot image according to an exemplary embodiment may allocate a partition for isolating a non-closeable file (step 701), and may manage files by unmounting at least one partition excluding the allocated partition 702).

In particular, the method of generating a hibernation-based snapshot image according to an exemplary embodiment may allocate a first partition, a second partition, and a third partition. For example, the first partition may include a non-closeable file, the second partition may isolate the non-closeable file, and the third partition may include a mirror partition of the second partition.

A method for creating a habenation-based snapshot image according to an exemplary embodiment of the present invention includes the steps of managing a file by moving a non-closeable file of the first partition to the second partition and isolating the non-closeable file of the second partition, You can mirror to a partition.

In addition, the method of generating a hovernation-based snapshot image according to an exemplary embodiment may generate a snapshot image after unmounting the at least one partition. That is, in the method of generating a habonation-based snapshot image according to an embodiment, a snapshot image can be generated without unmounting an isolated partition through a file link and mirroring, and a stable snapshot image can be generated.

To this end, the hibernation-based snapshot image generation method according to an exemplary embodiment may manage a file such that a mirrored copy of the non-closeable file exists in the third partition.

For example, the creation of the snapshot image may be performed by a user command or a system setting during system operation, but may be performed at the time of system termination in another embodiment.

The method of generating a hibernation-based snapshot image according to an exemplary embodiment of the present invention includes restoring a first partition and a third partition using the snapshot image, performing mirroring on the second partition, The third partition can be restored.

As a result, according to the present invention, it is possible to efficiently create a snapshot image while maintaining the stability of the system, to provide a fast and stable boot using the snapshot image, and to stably access the non-closeable file before the snapshot image is created .

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: Hibernation-based Snapshot Image Generator
101: first partition 102: second partition
103: Third partition 110: Partition management unit
120: file management unit 130: image generation unit
140:

Claims (17)

A partition management unit for allocating a partition for isolating the non-closeable file; And
A file manager for unmounting at least one partition excluding the allocated partition,
Based snapshot image generation device. The method according to claim 1,
The partition management unit,
And a third partition that is a mirror partition of the second partition, wherein the first partition includes the non-closeable file, the second partition isolates the non-closeable file, and the third partition is a mirror partition of the second partition. 3. The method of claim 2,
Wherein the file management unit moves the non-closeable file of the first partition to the second partition and isolates the non-
And replacing the non-closeable file of the first partition with a symbolic link for accessing the non-closeable file moved to the second partition. 3. The method of claim 2,
Wherein the file management unit mirrors the non-closeable file of the second partition to a third partition. 3. The method of claim 2,
Wherein the file management unit unmounts the first partition and the third partition. The method according to claim 1,
A snapshot image of the computing system after unmounting of the at least one partition;
Based snapshot image generation device. 6. The method of claim 5,
An image generating unit for generating a snapshot image of the computing system after unmounting of the first partition and the third partition,
Based snapshot image generation device. 8. The method of claim 7,
Wherein the image generating unit generates the snapshot image without unmounting the second partition. 3. The method of claim 2,
The file management unit,
And the file is managed so that the mirrored copy of the non-closeable file exists in the third partition. 3. The method of claim 2,
Restoring the first partition and the third partition using the snapshot image and performing a restoration by mirroring the third partition to the second partition using the snapshot image,
Based snapshot image generation device. Allocating a partition to isolate the non-closeable file; And
Managing files by unmounting at least one partition excluding the allocated partition
Based snapshot image. 12. The method of claim 11,
Wherein the step of allocating the partition comprises:
Allocating a first partition that includes the non-closeable file, a second partition that isolates the non-closeable file, and a third partition that is a mirror partition of the second partition,
Based snapshot image. 13. The method of claim 12,
Wherein the managing the file comprises:
Wherein the non-closeable file of the first partition is moved to the second partition and the closeable file of the second partition is mirrored to the third partition. 12. The method of claim 11,
Creating a snapshot image after unmounting of said at least one partition
Based on the snapshot image. 13. The method of claim 12,
Wherein the managing the file comprises:
Managing the file so that the mirrored copy of the non-closable file exists in the third partition
Based snapshot image. 13. The method of claim 12,
Restoring the first partition and the third partition using the snapshot image, and restoring the third partition to the second partition by mirroring the first partition and the third partition,
Based on the snapshot image. A computer-readable recording medium having recorded thereon a program for performing the method according to any one of claims 12 to 16.

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