JP2011090531A - Information storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the free space of a high speed storage medium as much as possible while maintaining conventional usability. <P>SOLUTION: An information storage device includes: a main controller 100; a memory 110; a medium control part 120; a high speed information storage medium 130; a low speed information storage medium 140; an external I/F 150; an information deletion control part 160; and an information copying part 170. When the information deletion control part 160 detects a deletion request from a host PC2, the information copying part 170 copies the information of the high speed information storage medium 130 to the low speed information storage medium 140. Also, when restoration is requested, the information copying part 170 copies the information from the low speed information storage medium 140 to the high speed information storage medium 130. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an information storage device, and more particularly to a method for deleting and restoring information.

  As background art in this technical field, there is, for example, Patent Document 1.

  Japanese Patent Application Laid-Open No. 2004-228561 avoids pressing down the “trash box” and the free space of the recording medium in a digital camera having an image erasing function. Is a method for controlling image recording of a digital camera having an image erasing function for selectively erasing an image recorded on a recording medium and recording the selected image in a “trash box”. When executing the image erasure in S207, the data amount of the image is reduced by reducing the size and / or compressing the image already recorded in the “trash box” in S210, and recorded in the “trash box” in S211. Is described.

  In addition, Patent Document 2 has a problem that “hierarchical control specialized for performance and device control with reduced power consumption but with reduced performance are low power consumption and performance that answer the power consumption problem in today's data center. A storage system with little degradation is needed. ”As a solution,“ storage power devices that consume less power but are disadvantageous in terms of write performance and device life can be mixed and these multiple storage tiers are controlled appropriately. The problem is solved by assigning a storage hierarchy corresponding to the data attribute and the policy specified for the volume, and at that time, the lifetime of the device such as the number of times of writing to the device or the number of times of erasing has been reduced. It manages influential parameters and power consumption in the device, and preferably controls the migration of the storage hierarchy. "

  Further, Patent Document 3 states that “a conventional storage device has no means for high-speed access even to frequently used data if it does not have a high-speed storage unit. If the storage unit is configured at a high speed, there is a disadvantage that the storage capacity cannot be increased and the cost is increased. ”As a solving means,“ data frequently accessed by the processor is stored in the high-speed storage unit 30 ”. The other data is stored in the storage unit 40 ”.

JP 2004-214943 A JP 2007-115232 A JP-A-6-28246

  In Patent Document 1, a limited free capacity can be effectively used for one storage, but a case where there are a plurality of storages is not considered.

  In Patent Document 2 and Patent Document 3, a plurality of storages are selectively used depending on the application, but an active mechanism for increasing the free capacity of high-speed storage is not prepared.

  Therefore, the present invention provides an information storage device including a high-speed information storage medium and a low-speed information storage medium. When the information deletion control unit detects that information is deleted, the information copying unit The information is copied to a low-speed information storage medium, and the information is completely deleted from the high-speed information storage medium to secure a free space. On the other hand, an information storage device is proposed that can maintain the conventional restoration function by copying information from a low-speed information storage medium to a high-speed information storage medium at the time of restoration. Specifically, the configuration described in the claims is provided.

  According to the present invention, a high-speed information storage device that is easy to use can be effectively used without any special operation by the user, so that convenience is enhanced. Further, a conventional trash box function (file restoration function) can be realized, which further increases convenience.

It is a block diagram explaining the whole structure of the information storage device which concerns on this invention. It is a flowchart in the case of deleting information. It is explanatory drawing of the folder structure in a low-speed information storage medium. It is a structural example of a deletion list. It is a flowchart in the case of restoring information. It is a flowchart in the case of deleting the information in the virtualized information storage device.

  Hereinafter, an example of an embodiment suitable for the present invention will be described with reference to the drawings.

  First, the configuration of the information storage device according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram illustrating the overall configuration of an information storage device according to the present invention.

  The information storage device 1 is connected to the host PC 2 and is an information storage device that reads and writes information. The information storage device 1 includes a main controller 100, a memory 110, a medium control unit 120, a high-speed information storage medium 130, a low-speed information storage medium 140, an external I / F (interface) 150, an information deletion control unit 160, an information copying unit 170, A virtualization control unit 180 is provided and connected to each other via an internal bus 190.

  The main controller 100 is composed of a CPU (Central Processing Unit) and the like, controls the overall operation of the information storage device 1, and performs information transmission / reception control and operation instructions between the control units.

  The memory 110 is used as a program area or a temporary work area of the main controller 100.

  The high-speed information storage medium 130 is an information storage medium such as an SSD (Solid State Disk) or an SRAM (Static Random Access Memory) that can be read and written at high speed. In this embodiment, an SSD is used as the high-speed information storage medium 130. The SSD has a feature that it can be accessed at high speed while having low power consumption.

  The low speed information storage medium 140 is an information storage medium having a low read / write performance such as an HDD (Hard Disk Drive) or an optical disk. In this embodiment, an HDD is used as the low-speed information storage medium 140. HDDs are slower in reading and writing speeds than SSDs and consume power, but are characterized by large capacity and low cost.

  The external I / F 150 includes an input / output unit such as a LAN (Local Area Network), a SATA (Serial Advanced Technology Attachment), and a USB (Universal Serial Bus), and transmits and receives data to and from the host PC 2. Any one of these interfaces may be installed, and there may be multiple.

  The information deletion control unit 160 detects the presence or absence of an information deletion request from the external I / F 150 and notifies the main controller 100 of it. Further, the presence / absence of an information restoration request from the external I / F 150 is detected and notified to the main controller 100. Detailed operation will be described later.

  The information copying unit 170 performs information copying from the high-speed information storage medium 130 to the low-speed information storage medium 140 or vice versa in response to an instruction from the main controller 100. The information copying unit 170 can transfer information by DMA transfer (Direct Memory Access), and can copy the information without depending on the main controller 100.

  A specific operation will be described below.

  FIG. 2 shows a flowchart when there is an information deletion request from the host PC 2.

  First, when the information deletion control unit 160 receives a deletion instruction from the host PC via the external I / F 150 (S200), the main controller 100 determines whether information to be deleted exists in the high-speed information storage medium 130 or low-speed information storage. It is determined whether it is in the medium 140 (S201). If it is in the high-speed information storage medium 130, the information copying unit 170 is instructed to copy the file to be deleted (S202). In this embodiment, an HDD is connected to the low-speed information storage medium 140. FIG. 3 shows the storage status of information in the HDD. The information in the HDD has a hierarchical structure with the HDD_ROOT 300 as a root as shown in the figure for easy management, and there are a Recycle_hdd301 folder and a Recycle_ssd302 folder as management folders. Recycle_hdd 301 is an area for storing data for restoration when information in the HDD is deleted, and the Recycle_ssd 302 folder is data for restoration when information in the SSD connected to the high-speed information storage medium 130 is deleted. Is an area for storing When there is a transfer instruction, the information copying unit 170 copies information to the Recycle_ssd 302 folder and prepares for a restoration request. In this way, even if information is deleted from the high-speed information storage medium 130 and the free space is increased, the information is stored in the low-speed information storage medium 140 and can be restored at any time. The deleted information is not accessed until it is restored, so even if the information is stored in a low-speed device, there is little impact on performance, and it is effective to maintain speed and secure free space. Means.

  Next, the deletion list is updated so that the deleted information can be restored (S203). An example of the deletion list is shown in FIG. The deletion list is a correspondence table of the file path before deletion, which is the storage location of information before deletion, and the file path for restoration after deletion, and can be restored to the original at the time of restoration. The deletion list itself may be stored in either the high-speed information storage medium 130 or the low-speed information storage medium 140, and the present invention is not limited to this. Further, without using the deletion list, the Recycle_ssd 302 folder can be used as the root folder of the high-speed information storage medium 130 to configure files and folders. The present invention does not limit the deletion list management method.

  Next, since the information has been deleted, the file system recorded in the high-speed information storage medium 130 is updated, and since the information for restoration has been written, a process for updating the file system of the low-speed information storage medium 140 is executed ( S204).

  If the deletion instruction from the host PC 2 is information existing in the low-speed information storage medium 140 (NO in S201), the file system is updated to move the deletion target information to the Recycle_hdd 301 folder in FIG.

  When the information in the high-speed information storage medium 130 is deleted by the above operation, the information in the high-speed information storage medium 130 is immediately deleted, so that a free space can be secured. At the same time, since the information to be deleted is copied in the low-speed information storage medium 140 for restoration, the restoration function is maintained and the convenience is maintained.

  Next, a procedure for restoring deleted information (information stored in the trash box) will be described. The configuration is the same as that of the first embodiment and will be described with reference to the flowchart of FIG.

  The flowchart of FIG. 5 shows a procedure for performing the restoration process. First, the information storage device 1 receives a restoration processing instruction from the host PC 2 (S500). As described in the first embodiment, the main controller 100 determines whether a file exists in the deletion list created when information is deleted from the high-speed storage medium 130 (S501). If it exists in the deletion list, the information is copied from the low-speed information storage medium 140 to the high-speed information storage medium 130 (S502). Copying is performed by the main controller 100 sending an instruction to the information copying unit 170. Next, the copied information is deleted from the deletion list (S503). Finally, the management folder file of the low-speed information storage medium 140 is deleted, and the file systems of the low-speed information storage medium 140 and the high-speed information storage medium 130 are updated (S504).

  In S501, when the file does not exist in the deletion list, that is, when the restoration destination is the low-speed information storage medium 140, the information in the Recycle_hdd301 folder may be restored to the original folder (S505).

  Here, without using the deletion list, the Recycle_ssd 302 folder can be used as the root folder of the high-speed information storage medium 130 to configure files and folders. That is, instead of using the deletion list, the high-speed information storage medium 130 may be restored so as to have a folder structure under the Recycle_ssd 302 folder.

  A case of storage virtualized so that it can be seen from the host PC 2 as one information storage device will be described.

  The virtualization control unit 180 in FIG. 1 has a function of controlling the host PC 2 connected to the external I / F 150 so that the high-speed information storage medium 130 and the low-speed information storage medium 140 appear as one storage medium. . Since the host PC 2 appears to be accessing one storage medium, the presence of the high-speed information storage medium 130 and the low-speed information storage medium 140 cannot be recognized. Information is allocated to the high-speed information storage medium 130 and the low-speed information storage medium 140 and recorded in consideration of the free capacity of the information storage medium 130 and the low-speed information storage medium 140. For example, control is performed such that information with high access frequency is placed in the high-speed information storage medium 130 and information with large capacity and low access frequency is placed in the low-speed information storage medium 140.

  Hereinafter, the deletion process will be described with reference to the flowchart of FIG. First, the host PC 2 issues a deletion instruction to the information storage device 1 (S600). The main controller 100 determines whether the information to be deleted is in the high-speed information storage medium 130 or the low-speed information storage medium 140. If the information is in the high-speed information storage medium 130, the information copying unit copies the information to be deleted to the low-speed information storage medium 140. 170 is instructed (S601). As in the first embodiment, the copy destination prepares a Recycle_ssd 302 folder or the like in the low-speed information storage medium 140 and stores information therein for restoration. The subsequent procedure is the same as that of the first embodiment. Even in such a virtualized information storage device, it is possible to effectively use a high-speed information storage device by storing the restoration information in the low-speed storage information device. In particular, in a virtualized device, information cannot be stored intentionally by the user, so that restoration data that is known to require no high-speed access speed can be immediately deleted from a high-speed information storage device. The invention is effective.

  Since the restoration procedure is the same as that of the second embodiment, detailed description thereof is omitted.

  In addition, the structure of this invention is not limited only to the above-mentioned embodiment, You may add a various change within the range which does not deviate from the summary of this invention. In particular, the combination of the SSD and the HDD has been described as an example. However, the present invention is not limited to this as long as it is a combination of information storage devices having different speeds. Further, the present invention is not limited to a storage device, and the method of the present invention may be realized by using a plurality of storage devices as one storage system. In that case, the place where information is saved may be considered not only by the access speed of the storage apparatus but also by the transmission speed between the storages.

  DESCRIPTION OF SYMBOLS 100 ... Main controller, 110 ... Memory, 120 ... Medium control part, 130 ... High-speed information storage medium, 140 ... Low-speed information storage medium, 150 ... External I / F, 160 ... Information deletion control part, 170 ... Information copying part, 180 ... Virtualization control unit.

Claims (4)

In an information storage device comprising a high-speed information storage medium having a high information transfer speed and a low-speed information storage medium having a low information transfer speed,
An information deletion control unit and an information copying unit;
When the information deletion control unit detects that information is deleted,
Before the deletion, the information copying unit copies the information of the high-speed information storage medium to the low-speed information storage medium,
An information storage device, wherein information is completely deleted from the high-speed information storage medium. The information storage device according to claim 1,
An information configuration storage unit that stores file lists and attributes,
When information is deleted from the high-speed information storage medium,
In the information configuration storage unit, the deletion is performed;
An information storage device for recording configuration information of information copied to the low-speed information storage medium. The information storage device according to claim 1, wherein:
A virtualization control unit for notifying a device that has accessed the high-speed information storage medium and the low-speed information storage medium as one information storage unit;
If the deleted information exists in the high-speed information storage medium,
Before the deletion, the information copying unit copies the information in the high-speed information storage medium to the low-speed information storage medium, and completely deletes the information from the high-speed information storage medium. apparatus. The information storage device according to any one of claims 2 and 3,
When the information deletion control unit detects an information restoration request,
An information storage device, wherein information copied to the low-speed information storage medium is copied to a high-speed information storage medium to restore the information.

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