JP3216618B2 - Data failure recovery method for video server device and medium recording data failure recovery program - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a video server device.
The present invention relates to a data failure recovery method and a medium recording a data failure recovery program, and in particular, when a data failure occurs in a storage device, reads the failed data from an external device and recovers the data failure from a video server device . Obstacle
It relates to harm recovery methods .

[0002]

2. Description of the Related Art FIG. 3 shows a conventional example. A video server device 50, a mirror server device 60 as another video server device, and a client device 70 are connected on a network. In the video server device 50, data constituting a video file is distributed and stored in the storage devices A, B, and C. That is, one video file is stored across a plurality of storage devices. For example, FIG.
It is stored as shown in FIG. The storage device A stores data # 1, # 4, and # 7. Data # 2, # 5, and # 8 are stored in the storage device B. Data # 3, # 6, and # 9 are stored in the storage device C.
However, the addresses in the storage device are not always arranged in ascending order of data. The CPU 51 of FIG. 3 reads out these data from each storage device in the order of data and transmits the data to the client device 70. Reference numeral 52 denotes a network interface (I / F) for transmitting and receiving data.

The configuration of the mirror server device 60 is the same as that of the video server device 50, and the same video files as those of the storage devices A, B, and C are distributed and stored in the storage devices D, E, and F. However, the storage positions of the data constituting the video file are different from those of the storage devices A, B, and C. The storage devices D, E, and F store data, for example, as shown in FIG. In the storage device D, data # 3, # 6, #
9 is stored. In the storage device E, data # 1, #
4 and # 7 are stored. The storage device F has data #
2, # 5, and # 8 are stored.

When a data failure occurs in an arbitrary storage device of the video server device 50, the CPU 51 receives data transferred from the mirror server device 60 and recovers the data failure.

[0005]

However, in the above conventional example, the data storage positions of the storage devices A, B, and C do not match the data storage positions of the storage devices D, E, and F. For this reason, in the video server device 50, even if a data failure occurs in one storage device (for example, C), all the data in the storage devices D, E, and F on the mirror server device 60 side are stored in the storage device A. , B, and C, and the entire video file is updated to recover from the data failure. For this reason, there is an inconvenience that it takes time to recover the data failure.

[0006]

An object of the present invention is to improve the inconvenience of the prior art, and in particular, to record a video server apparatus capable of recovering a data failure in a short time, a data failure recovery method thereof, and a data failure recovery program. Its purpose is to provide a medium.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there are provided a plurality of storage devices physically storing data constituting a video file in a distributed manner, and identifiers of the plurality of storage devices. And a chain information storage unit that stores a storage connection of data constituting the video file based on a list of addresses in the storage device, and the plurality of storage devices in the order of storage connection of the data stored in the chain information storage unit. CP to read data from
U, and a video server device having a network I / F for sequentially transmitting data read by the CPU to the client, and the same as the data constituting the video file.
Data is stored in a storage connection different from the above storage connection.
Mirror server that remembers and stores the storage connection
A data failure recovery method used for the backup device , wherein when data in any of the storage devices is damaged, data stored in the storage device in which the damage has occurred is based on information in the chain information storage unit. identified, thereby requesting the specified data to the mirror server, the mirror
The specific data transferred from the server device is updated to the damaged storage device. The invention described in claim 2 is substantially the same. To these
It is intended to achieve the above object.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 1, C of the video server device 10
The PU 1 is provided with a chain information storage unit 2.
The chain information stored in the chain information storage unit 2 describes a storage connection of data constituting the video file. For example, in order from data # 1, address (cluster) 3 of storage device A → address 5 of storage device A → address 7 of storage device B → address 1 of storage device C
.. Are described. CP
U1 sequentially reads data according to the chain information and transmits the data to the client 70. Similarly, the mirror server device 20 as another video server device has the chain information storage unit 12 for its own storage devices D, E, and F. Here, storage devices A, B, C and storage devices D, E,
F is the same as the conventional one in that the same video file is distributed and stored. However, the data connection is different between the chain information of the video server device 10 and the chain information of the mirror server device 20.

FIG. 2 shows the CPU 1 of the video server device 10.
9 is a flowchart of a data failure recovery process executed by the CPU 11 of the mirror server 20.

When the CPU 1 of the video server device 10 detects a data failure in its own storage device, it first searches the chain information of its own device by using the identifier of the failed storage device as a key, and searches for the storage device in which the failure occurred. Is specified (S1). Then, it requests the mirror server device 20 to transfer only the specified data (S2).
CPU 11 of mirror server device 20 receiving this request
Identifies the storage device storing the requested specific data from its own chain information (S3), and reads out only the requested specific data from its own storage device.
Then, the read data is transferred to the video server device 10 (S4). Video server device 1 receiving this transfer
The CPU 1 of 0 updates the received data to the failed storage device (S5). Thus, recovery from a data failure is achieved.

Here, the above-described CPU 1 or CPU 11
Is realized by sequentially executing a data failure recovery program read from a computer-readable medium.

According to the present embodiment described above, data stored in a storage device in which a data failure has occurred is specified from the chain information, and only the transfer of the specified data is requested to an external device. In the mirror server device,
The storage location of the requested data is specified based on its own chain information, and only the specified data is read and transferred to the video server device. And in the video server device,
Since the data failure is recovered by updating the transferred data to the failed storage device, the recovery of the data failure is shorter than in the conventional example in which the data of all the storage devices are updated and the entire video file is updated. Can be done in time.

Here, the external device to the video server device 10 (in this embodiment, the mirror server device 20 as another video server device) may not be a device having the same function as the video server device 10. Stores the same data as the storage devices A, B, and C of the server device 10,
What is necessary is just to have a function that can transfer the data requested in response to the transfer request.

[0015]

Since the present invention is constructed and functions as described above, according to this, data stored in a storage device in which a data failure has occurred is specified from the chain information, and only the transfer of the specified data is performed. A request is made to the mirror server device, and the mirror server device specifies the storage location of the requested data based on its own chain information, reads out only the specified data, and transfers it to the video server device. Then, in the video server device, the data failure is recovered by updating the transferred data to the failed storage device, so that the video server device and the mirror server device recover the data failure.
Even if data storage connections are different, data failures can be recovered in a shorter time than in the conventional example in which data in all storage devices is updated and the entire video file is updated. Of excellent video server equipment
A medium on which a data failure recovery method and a data failure recovery program are recorded can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart of a data failure recovery process executed by each CPU of FIG. 1;

FIG. 3 is a block diagram showing a configuration of a conventional example.

FIG. 4 is an explanatory diagram showing an example of a storage state of a video file.

[Explanation of symbols]

 1,11 CPU 2,12 chain information storage unit10 Video server device 20 Mirror server device  A, B, C, D, E, F storage device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G06F 3/06 G06F 12/16 G06F 13/00 H04N 7/173

Claims (2)

(57) [Claims] 1. Distributed data constituting a video file
A plurality of physically stored storage devices and the plurality of storage devices
A list of device identifiers and addresses in the storage device
SaidvideoStorage connection of the data that makes up the file
And a chain information storage unit storing the
In the order of the connection sequence of the data stored in the storage unit.
CPU that reads data from a number of storage devices, and this CP
U sends the read data to the client sequentially.
Server device with network I / FWhen, The same data as the data making up the video file
When storing with a storage connection different from the storage connection
To the mirror server device that originally stored the storage connection
The data failure recovery method used , anySaidIf data on the storage device is damaged,
The data stored in the storage device where the
Specified based on the information in the
DataThe mirror server deviceRequest thatmirror
-Server deviceSpecific data transferred from
Video characterized by updating to a damaged storage device
Data failure recovery method for server device. 2. Distributing data constituting a video file
A plurality of physically stored storage devices and the plurality of storage devices
A list of device identifiers and addresses in the storage device
SaidvideoStorage connection of the data that makes up the file
And a chain information storage unit storing the
In the order of the connection sequence of the data stored in the storage unit.
CPU that reads data from a number of storage devices, and this CP
U sends the read data to the client sequentially.
Server device with network I / FWhen, The same data as the data making up the video file
When storing with a storage connection different from the storage connection
With the mirror server device that originally stored the storage connection To
Used in anySaidIf data on the storage device is damaged,
The data stored in the storage device where the
Processing based on the information in the
More specific dataThe mirror server deviceRequest
Processing andThe mirror server deviceHas been transferred from
A process of updating specific data to the storage device in which the corruption has occurred;
Data recovery program for causing the CPU to execute
The medium on which the system was recorded.