CN101551802B - File access method for a management system - Google Patents

Abstract

The file access method for a management system, the management system includes a management end device, a managed end device and a system management device, the file access method includes through the system management device, the entity storage device of the management end device is simulated to the managed end device, so as to form a virtual storage device in the managed end device; when the managed end device accesses a file of the virtual storage device, outputting a request instruction to the system management device through the operating system of the managed end device but not through the file system of the managed end device; and according to the request command, the management end device accesses the entity storage device through the operating system of the management end device but not through the file system of the management end device.

Description

File access method for a management system

technical field

The invention relates to a file access method used in a management system, in particular to a file access method which can avoid file asynchrony, prevent data damage, and maintain normal operation of the system.

Background technique

In order to effectively provide remote management services, the prior art provides a server using a system management device (System Management Device), so that managers can maintain or monitor servers in the computer room through the network anytime and anywhere. Generally speaking, the system management device usually provides KVM-over-IP, virtual storage (Virtual Storage, or Drive Redirection, VirtualMedia) and other functions.

In the KVM-over-IP function, KVM is the abbreviation of the three prefixes Keyboard, Video, and Mouse, which means that 2 to 4032 computers are controlled by a set of keyboards, monitors, and mice. General KVM can only be operated by administrators on site, but if the KVM host cannot be accessed, it is impossible to immediately solve server problems or change server settings. KVM-over-IP is a brand-new solution, which uses the existing network environment to transmit KVM operation signals to the managed end through the network, so it is not limited by distance, time, access control, personal factors, etc., making the system Managers can manage, control, and monitor the status of the managed terminal through the network anytime and anywhere, so as to grasp the situation at any time and deal with it immediately.

The concept of the virtual storage function is similar to the KVM-over-IP function, please refer to Figure 1 for related descriptions. In Fig. 1, a system management device 104 emulates a virtual storage device 108 on a managed device 102 through a system management chip 110, such as storage devices such as floppy disk drives, hard disk drives, and optical drives, and manages a virtual storage device 108 through the network. The data of a physical storage device 106 in the end device 100 is transmitted to the managed end device 102 . The managed device 102 regards the virtual storage device 108 as a physical storage device, and its data content is exactly the same as that of the physical storage device 106 . In other words, the managed device 102 is as if the same storage device as the physical storage device 106 is set, so that the managed device 102 can exchange data with the management device 100 without a network driver. Correspondingly, the management terminal device 100 is provided with a management program 112, which is used to communicate with the system management device 104 through a network card 114, so as to load the physical storage device 106 to the managed terminal device 102 or move it from the managed terminal device 102. remove. For the operation of the system management device 104, please refer to the following description.

First of all, applications access data on disks in the form of accessing files, while operating systems implement file access services in a hierarchical structure. That is, the location of the file stored on the disk is known through the file system first, and then the data on the disk is accessed through the disk driver. When the operating system is turned on, it will store the relevant data of the file system in the memory, and if there is an update, the data will be written to the disk. Therefore, if data is not written to the disk through the file system of the operating system, the file system cannot know that the file has been updated.

Next, please refer to FIG. 2 and FIG. 3. FIG. 2 is a schematic diagram of when the managed device 102 in FIG. 1 reads a file from the virtual storage device 108, and FIG. A schematic diagram of the storage device 108. In FIG. 2, when the application program in the managed device 102 reads the file of the virtual storage device 108, the application program will output a request signal to the system management device 104 via a path a1. That is to say, the application program first reads the file of the virtual storage device 108 through the system call function of the operating system, and the operating system will know the location of the file to be read in the virtual storage device 108 through the file system, and then through the driver program. The virtual storage device 108 reads the file. Next, the system management device 104 transmits the request signal to the management program 112 in the management terminal device 100 via a path a2 through the network. Then, the management program 112 reads the required file from the physical storage device 106 via a path a3, and sends it back to the system management device 104 through the network (ie, the path a2) to complete the file reading operation.

On the other hand, in FIG. 3 , when the managed device 102 writes a file to the virtual storage device 108 , the application program will output a request signal to the system management device 104 via a path b1 . That is, the application program first writes the file to the virtual storage device 108 through the system call function of the operating system, and the operating system determines which locations of the virtual storage device 108 to write the file through the file system, and then writes the file through the driver program to the virtual storage device 108 . Next, the system management device 104 transmits the request signal and the file to be written to the management program 112 in the management terminal device 100 via a path b2 through the network. Since the request signal for writing a file is a relatively low-level instruction, the contained information is not enough for the system management device 104 or the hypervisor 112 to write the file into the physical storage device 106 through the file system of the operating system. Therefore, when the management program 112 receives the write request signal and the file to be written, the management program 112 does not pass through the file system of the operating system, but directly writes the file into the physical storage device 106 via a path b3, so that Complete the write action. In other words, when the managed device 102 writes a file to the virtual storage device 108, the file system of the management device 100 cannot know the file update situation of the physical storage device 106, causing the management device 100 and the managed device 102 The problem of out-of-sync files between files. In this case, when other applications of the management device 100 access the files of the physical storage device 106 through a path b4, data damage may occur, resulting in system errors.

Therefore, in order to avoid the above problems, the prior art usually restricts the user of the management device 100 from accessing the files of the physical storage device 106 . In other words, the management device 100 and the managed device 102 cannot achieve bidirectional access to the files of the physical storage device 106 , thus limiting its scope of application.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a file access method for a management system.

The invention discloses a file access method for a management system. The management system includes a management device, a managed device and a system management device. The system management device is between the management device and the managed device. Between end devices, the file access method includes emulating a physical storage device of the management end device into the managed end device through the system management device, so as to form a virtual storage device in the managed end device ; When the managed device accesses a file of the virtual storage device, a request command is output to the system management device through a first operating system of the managed device instead of via a first operating system of the managed device The first file system outputs the request command to the system management device; and according to the request command, the management device accesses the file to the physical storage device through a second operating system of the management device, and The file access operation is performed on the physical storage device without going through a second file system of the management terminal device.

Description of drawings

FIG. 1 is a schematic diagram of a conventional system management device, a managed device and a management device.

FIG. 2 is a schematic diagram of when the managed device in FIG. 1 reads a file from a virtual storage device.

FIG. 3 is a schematic diagram of when the managed device in FIG. 1 writes a file to a virtual storage device.

FIG. 4 is a schematic diagram of a process in Embodiment 1 of the present invention.

FIG. 5 is a schematic diagram of writing a file to a virtual storage device through the managed device in FIG. 1 according to the flow in FIG. 4 .

Description of reference symbols

100 management device

102 managed device

104 System management device

106 Physical storage device

108 virtual storage device

110 System Management Chip

112 Management program

114 Network card

40 Process

400, 402, 404, 406, 408 steps

a1, a2, a3, b1, b2, b3, b4, c1, c2, c3, c4 path.

Detailed ways

Please refer to FIG. 4 , which is a schematic diagram of a process 40 according to Embodiment 1 of the present invention. The process 40 is used for accessing files in a management system, which is preferably the system shown in FIG. 1 . Process 40 includes the following steps:

Step 400: start.

Step 402: Using the system management device, emulate a physical storage device of the management device into the managed device to form a virtual storage device in the managed device.

Step 404: When the managed device accesses a file of the virtual storage device, a first operating system of the managed device outputs a request command to the system management device without going through the managed device A first file system of a system outputs the request command to the system management device.

Step 406: According to the request instruction, the management terminal device accesses the file to the physical storage device through a second operating system of the management terminal device, without going through a second file system of the management terminal device The file access operation is performed on the entity storage device.

Step 408: end.

According to the process 40, after the system management device forms a virtual storage device in the managed device, if the managed device needs to access a file in the virtual storage device, the present invention directly uses the operating system of the managed device to Outputting a request command to the system management device without outputting the request command through the file system. In other words, when the application program of the managed device needs to access the files of the virtual storage device, the present invention directly outputs the access command to the system management device instead of outputting the access command through the file system. Correspondingly, the management terminal device also directly accesses files to the physical storage device through the operating system instead of performing file access operations on the physical storage device through the file system.

In this case, when the application program of the management terminal device accesses the files of the physical storage device, the application program directly performs file access actions on the physical storage device through the operating system, instead of performing file access operations on the physical storage device through the file system. access action. For example, please refer to FIG. 5 , which is a schematic diagram of writing a file to the virtual storage device 108 through the managed device 102 in FIG. 1 according to the process 40 . In FIG. 5 , when the managed device 102 writes a file to the virtual storage device 108 , the application program will output a request signal to the system management device 104 via a path c1 . That is, the application program directly writes the file to the virtual storage device 108 through the system call function and the driver program of the operating system instead of the file system. Next, the system management device 104 transmits the request signal and the file to be written to the management program 112 in the management terminal device 100 via a path c2 through the network. When the management program 112 receives the write request signal and the file to be written, the management program 112 will not pass through the file system of the operating system, but directly write the file into the physical storage device 106 through a path c3 to complete the writing. entry action. At the same time, if other applications of the management terminal device 100 need to access the files of the physical storage device 106, the application program will access the files of the physical storage device 106 through a path c4; that is, directly through the operation without going through the file system The system performs file access operations.

In short, through the present invention, the file access actions in the management terminal device 100 and the managed terminal device 102 will not go through the file system, thus avoiding the problem of file synchronization and preventing data damage, so as to maintain the normality of the system operate.

In summary, when the management device or the managed device performs file access operations, the present invention does not pass through the file system but directly performs relevant processing by the operating system to avoid the problem of file asynchrony and prevent data damage. In order to maintain the normal operation of the system.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (5)

1. A file access method for a management system, the management system includes a management device, a managed device and a system management device, the system management device is between the management device and the managed Between end devices, the file access method includes: emulating a physical storage device of the management device into the managed device through the system management device, so as to form a virtual storage device in the managed device; When the managed device accesses a file of the virtual storage device, a request command is output to the system management device through a first operating system of the managed device instead of via a first operating system of the managed device a file system outputs the request command to the system management device; and According to the request instruction, the management terminal device accesses the file to the physical storage device through a second operating system of the management terminal device, instead of accessing the entity through a second file system of the management terminal device. The storage device performs the access operation of the file. 2. The file access method as claimed in claim 1, wherein the data of the file in the physical storage device of the management device is stored in consecutive sectors. 3. The file access method according to claim 1, wherein, according to the request instruction, the management terminal device performs the file access action on the physical storage device through the second operating system of the management terminal device without Accessing the file to the physical storage device via the second file system of the management terminal device includes: When the request instruction indicates to read the file, the management terminal device reads the file in the physical storage device through the second operating system of the management terminal device, without going through the second file of the management terminal device the system reads the file in the physical storage device; and The system management device outputs the file to the managed device. 4. The file access method according to claim 1, wherein, according to the request instruction, the management terminal device performs the file access action on the physical storage device through the second operating system of the management terminal device, Accessing the file to the physical storage device without going through the second file system of the management device includes: When the request instruction indicates to write the file, the management terminal device writes the file into the physical storage device through the second operating system of the management terminal device, without going through the second file of the management terminal device The system writes the file into the physical storage device. 5. The file access method as claimed in claim 1, further comprising: When an application program of the management terminal device accesses a first file of the physical storage device, the first file access action is performed on the physical storage device through the second operating system of the management terminal device, without The first file is accessed to the physical storage device via the second file system of the management terminal device.

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