JPH10271447A - Video server system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the video server system where a load imposed on server side computers is efficiently shared among them with respect to requests from a plurality of clients in comparison with a conventional service system where a plurality of disk devices are provided to a server side and reproduction information of a consecutive stream is sent to clients as service information according to requests from the clients. SOLUTION: A plurality of disk devices 11A, 11B, 11C share recording of data streams of each program in the order of streams in the unit of small tip data (striping data) and client side computers 13 reproduce the data streams in the order of the streams. Thus, a load of server side computers 10A, 10B, 10C is shared efficiently with respect to requests from the clients.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video server system for transmitting continuous stream reproduction information to a client in accordance with a request from the client.

[0002]

2. Description of the Related Art Conventionally, in a video server system in which information for reproducing a continuous stream is transmitted to a client as provided information in accordance with a request from the client, when the server has a plurality of disk devices, One or a plurality of pieces of program information, which are grouped in units of programs, are stored. In response to a program request from a client, a disk device that records (stores) the program information is activated, and provides a client with continuous stream program information. Is done.

FIG. 4 shows a configuration example of a conventional video server system at this time. In this example, program 0 is recorded on disk 0, program 1 is recorded on disk 1, and program 2 is recorded on disk 2. In the figure, data-0, data-
1, data-2,... Each represent data serving as a transfer unit.

However, in such a conventional system configuration, there is a problem that when a plurality of clients request the same program, a great deal of load is imposed on a computer on the server side which is in charge of the requested program. Was. Further, with this, when a plurality of clients request the same program, there is a problem that the response waiting time for the request is lengthened according to the number of the clients, and the service is reduced. Further, when a failure occurs in a disk device or a computer for a certain program, the program cannot be provided at all.

[0005]

As described above, in a conventional video server system having a plurality of disk devices on the server side and transmitting information for reproducing a continuous stream to the client as provided information in accordance with a request from the client. Further, when the same program is requested from a plurality of clients, there is a problem that a great load is applied to a computer on the server side that handles the requested program. Further, with this, when a plurality of clients request the same program, there is a problem that the response waiting time for the request is lengthened according to the number of the clients, and the service is reduced. Further, when a failure occurs in a disk device or a computer for a certain program, the program cannot be provided at all.

The present invention has been made in view of the above circumstances,
In a conventional video server system having a plurality of disk devices on the server side and transmitting continuous stream reproduction information as provision information to the client in accordance with a request from the client, the server computer responds to requests from the plurality of clients. It is an object of the present invention to provide a video server system capable of efficiently distributing the load.

The present invention also relates to a conventional video server system having a plurality of disk units on the server side and transmitting continuous stream reproduction information to the client as provided information in accordance with a request from the client. An object of the present invention is to provide a highly reliable video server system that can continuously supply data of a continuous stream to a client even if a failure occurs in some computers.

Further, the present invention relates to a conventional video server system having a plurality of disk devices on a server side and transmitting reproduction information of a continuous stream as provided information to a client in accordance with a request from the client. It is an object of the present invention to provide a highly reliable video server system capable of restoring continuous stream data on the client side even if a failure occurs in some computers.

[0009]

According to the present invention, data streams of a plurality of programs are distributed and recorded on a plurality of disks as small piece data (striping data) in units of a predetermined data amount, whereby a plurality of programs can be transmitted from a plurality of clients. The load on the server-side computer in response to a program request can be efficiently distributed.

[0010] Further, in response to this, when a plurality of clients request the same program, the inconvenience of increasing the response waiting time for the request according to the number of clients can be eliminated, and the information providing service can be improved.

The data streams of a plurality of programs are converted into small piece data (striping data) in a predetermined data amount unit.
Separately recorded as a plurality of disks, separately prepare parity data based on each piece of data according to the data stream of the program on an independent disk, and constantly or as necessary, this parity data to the client By transmitting and restoring the small piece data lost on the client side, the reliability of the system can be significantly improved.

That is, the present invention is a video server system for transmitting continuous stream reproduction information to a client as provided information in accordance with a request from the client,
A plurality of server-side computers, a plurality of provided information recording / reproducing devices provided corresponding to the plurality of server-side computers, each having a plurality of divided data areas, and a line connection to each of the server-side computers. And at least one client-side computer for receiving the continuous stream provided information, wherein the plurality of provided information recording / reproducing apparatuses record the continuous stream information in small data units in the divided data areas in a distributed manner. According to a request from the client computer, the plurality of server computers access the divided data areas from the provided information recording / reproducing devices provided in correspondence with each other, and read out the small piece data of the continuous stream information in the stream order. Transmitting means to the client computer via a line, wherein the client computer comprises: Characterized by comprising a means for reproducing and outputting pieces data received from said plurality of server computers to the stream order.

The present invention is also a video server system for transmitting continuous stream reproduction information to a client as provision information in accordance with a request from the client,
A plurality of first server-side computers and at least one second
Server-side computers, and a plurality of first provided information recording / reproducing devices provided corresponding to the plurality of first server-side computers, each having a plurality of divided data areas,
A plurality of second provided information recording / reproducing devices each having a plurality of divided data areas provided corresponding to the second server-side computer, and a continuous stream provided information connected to each of the server-side computers; And at least one client-side computer for receiving, the plurality of first provided information recording / reproducing devices each of which records continuous stream information in a divided data area in a distributed manner in units of small pieces of data, and
The second provided information recording / reproducing device is an exclusive OR (Exclusive-OR) unit for each piece of data associated with one data area which is recorded in the plurality of first provided information recording / reproducing devices and is associated with each other.
OR) The parity data of the calculated continuous stream information is recorded in units of small pieces of data, and the plurality of first server-side computers are respectively provided with corresponding first provided information recordings in response to requests from the client-side computers. From the playback device, a means for accessing the partitioned data area, reading out the piece data of the continuous stream information in the stream order, and transmitting it to the client-side computer via a line,
The second server-side computer reads the parity data corresponding to the small piece data read from the first provided information recording / reproducing device in a stream order according to a request from the client-side computer, and sends the parity data to the client-side computer via a line. It has a transmitting means.

The present invention is also a video server system for transmitting continuous stream reproduction information to a client as provision information in accordance with a request from the client,
A plurality of first server-side computers and at least one second
Server-side computers, and a plurality of first provided information recording / reproducing devices provided corresponding to the plurality of first server-side computers, each having a plurality of divided data areas,
A plurality of second provided information recording / reproducing devices each having a plurality of divided data areas provided corresponding to the second server-side computer, and a continuous stream provided information connected to each of the server-side computers; And at least one client-side computer for receiving, the plurality of first provided information recording / reproducing devices each of which records continuous stream information in a divided data area in a distributed manner in units of small pieces of data, and
The second provided information recording / reproducing device is a parity of continuous stream information obtained by performing an exclusive OR operation on each piece of data for one data area related to each other recorded in the plurality of first provided information recording / reproducing devices. Data is recorded in units of small pieces of data, and the plurality of first server-side computers are divided into data areas divided by first provided information recording / reproducing devices provided in accordance with requests from the client-side computers. To read the small piece data of the continuous stream information in the stream order, and transmit it to the client-side computer via a line, wherein the second server-side computer responds to the request from the client-side computer by Parity data corresponding to the small piece data read from the provided information recording / reproducing apparatus is read out in the stream order, and the Means for transmitting to the client-side computer, wherein the client-side computer receives the small piece data received from the plurality of server-side computers and received from the first server-side computer from the second server-side computer Means for compensating for the parity data and reproducing and outputting the data in stream order.

The present invention also relates to a video server system for transmitting continuous stream reproduction information to a client as provided information in accordance with a request from the client,
A plurality of first server-side computers and at least one second
Server-side computers, and a plurality of first provided information recording / reproducing devices provided corresponding to the plurality of first server-side computers, each having a plurality of divided data areas,
A plurality of second provided information recording / reproducing devices each having a plurality of divided data areas provided corresponding to the second server-side computer, and a continuous stream provided information connected to each of the server-side computers; And at least one client-side computer for receiving, the plurality of first provided information recording / reproducing devices each of which records continuous stream information in a divided data area in a distributed manner in units of small pieces of data, and
The second provided information recording / reproducing device is a parity of continuous stream information obtained by performing an exclusive OR operation on each piece of data for one data area related to each other recorded in the plurality of first provided information recording / reproducing devices. Data is recorded in units of small pieces of data, and the plurality of first server-side computers are divided into data areas divided by first provided information recording / reproducing devices provided in accordance with requests from the client-side computers. To read the small piece data of the continuous stream information in the stream order, and transmit it to the client-side computer via a line, wherein the second server-side computer is connected to one of the first server-side computers. When an abnormality occurs, parity data corresponding to the small piece data to be transmitted from the first server computer in which the abnormality has occurred is transmitted via the line to the client. Means for transmitting to the client-side computer, the client-side computer receiving from the plurality of server-side computers and reproducing and outputting small piece data received from the first server-side computer in stream order; Small piece data that cannot be normally received from the first server-side computer is restored based on the parity data received from the second server-side computer and the small piece data received from the first server-side computer, and reproduced and output in stream order. Characterized in that it comprises means for performing

The present invention is also a video server system for transmitting continuous stream reproduction information to a client as provided information in accordance with a request from the client,
A plurality of first server-side computers and at least one second
Server-side computers, and a plurality of first provided information recording / reproducing devices provided corresponding to the plurality of first server-side computers, each having a plurality of divided data areas,
A plurality of second provided information recording / reproducing devices each having a plurality of divided data areas provided corresponding to the second server-side computer, and a continuous stream provided information connected to each of the server-side computers; And at least one client-side computer for receiving, the plurality of first provided information recording / reproducing devices each of which records continuous stream information in a divided data area in a distributed manner in units of small pieces of data, and
The second provided information recording / reproducing device is a parity of continuous stream information obtained by performing an exclusive OR operation on each piece of data for one data area related to each other recorded in the plurality of first provided information recording / reproducing devices. Data is recorded in units of small pieces of data, and the plurality of first server-side computers are divided into data areas divided by first provided information recording / reproducing devices provided in accordance with requests from the client-side computers. To read the small piece data of the continuous stream information in the stream order and transmit the small piece data of the continuous stream information to the client-side computer, wherein the second server-side computer has a parity corresponding to the small piece data requested by the client-side computer. Means for transmitting data to the client-side computer via a line, wherein the client-side computer Receiving from the server computer of,
Means for reproducing and outputting the small piece data received from the first server-side computer in stream order, and when there is small piece data that cannot be normally received from the first server-side computer, the second server-side computer normally returns. Means for receiving parity data corresponding to unreceivable small piece data, restoring the unreceivable small piece data based on the parity data and the small piece data received from the first server-side computer, and reproducing and outputting them in stream order It is characterized by having.

In the above-mentioned video server system, the small piece data or the small piece data and the parity data are each transferred to the client computer as packet data.

In the above-mentioned video server system, the provided information recording / reproducing apparatus records control information indicating a stream order in addition to the small piece data or the parity data. And read out.

In the above-mentioned video server system, the server-side computer is characterized in that it has means for outputting control information indicating a stream order in addition to small piece data or parity data.

As described above, the data stream of each program is distributed and recorded on a plurality of disks in the order of small pieces of data (striping data) in the stream order, and reproduced in the stream order on the client side. The load on the side computer can be efficiently distributed.

Further, in accordance with this, when the same program is requested from a plurality of clients, the inconvenience that the response waiting time for the request becomes long according to the number of clients can be eliminated, and the information providing service can be improved.

In the above-mentioned video server system, small piece data (striping data) to be a set is set.
By adding a disk device that stores parity data calculated by Exclusive-OR and a server-side auxiliary computer that handles it, if a failure occurs in any of the server-side computers, the server-side auxiliary By outputting the corresponding parity data as an alternative, the computer can continuously provide the program requested by the client.

On the client side, the received small piece data (striping data) is sequentially processed based on the position (order) information, but when the alternative parity data is sent. By using the corresponding piece data, the replacement piece data can be restored, and the reproduction process of the continuous stream information can be continued.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the video server system according to the first embodiment of the present invention.

In FIG. 1, 10A, 10B, 10C,
And 11A, 11B, and 11C are system components on the server side, and 10A, 10B, and 10C are server-side computers (operating servers), 11A, 11B, and 11C.
C is a disk device constituting a provided information recording / reproducing device provided corresponding to the server-side computers 10A, 10B, 10C.

Reference numeral 12 denotes a plurality of server computers 10A, 10
B, 10C and a communication line provided for data transmission / reception between a plurality of client computers. , 13, 13,... Are connected via the communication line 12 to the server-side computers 10A, 10B,
10C, a program request is issued to the server-side computers 10A, 10A.
B and 10C are a plurality of client-side computers that receive the provision of continuous stream program information according to the request.

The server computers 10A, 10B, 10
C, the disk devices 11A, 11B,
11C, for one piece of program information of a continuous stream, records the continuous stream information in a stream order in units of small piece data (striping data).

That is, in this example, for each of a plurality of programs (programs 0, 1, 2), data i-0, da
ta i-1, data i-2, data i-3, data i-4, data i-5, ...
(Where i is 0/1/2) is the piece data (striping data), data i-0 is the disk device 11A, data i-1
Is the disk device 11B, data i-2 is the disk device 11
C, data i-4 are recorded (stored) in a distributed manner, such as disk device 11A, data i-5 is disk device 11B, etc.
Keep it.

Server computers 10A, 10B, 10C
When receiving a program request from the client-side computer 13, the client sequentially transfers small piece data (striping data) of the program in the stream order.

At this time, the server computers 10A, 10B,
10C adds position (order) information to each piece data (striping data) to be transferred. Upon receiving the small piece data of the requested program from the server-side computers 10A, 10B, and 10C, the client-side computer 13 sequentially processes and reproduces the small piece data in an array according to the position (order) information attached to the small piece data.

As described above, the data stream of each program is distributedly recorded in the order of small pieces of data (striping data) on the plurality of disk devices 11A, 11B, and 11C, and is reproduced by the client computer 13 in the order of the streams. The load on each of the server-side computers 10A, 10B, and 10C for a request from a client can be efficiently distributed.

Further, in accordance with this, when a plurality of clients request the same program, the inconvenience that the response waiting time for the request becomes long according to the number of clients is eliminated, and the information providing service can be improved.

FIG. 2 is a block diagram showing the configuration of a video server system according to a second embodiment of the present invention. The same parts as those in FIG. 1 described above are denoted by the same reference numerals and description thereof will be omitted.

In the second embodiment, a dedicated device for transferring parity data of continuous stream information in small data units is added to the server of the system in the first embodiment.

That is, in this embodiment, the disk device 11A provided corresponding to the server computers 10A, 10B, and 10C and distributedly records the data streams of a plurality of programs as small piece data (striping data) of a predetermined data amount unit. , 11B, and 11C, as well as the exclusive OR (Exclus) of each piece of data for one data area related to each other recorded in each of the disk devices 11A, 11B, and 11C.
ive-OR) A parity data disk device 11D that records parity data of the calculated continuous stream information in small data units is provided, and the parity data disk device 11D is drive-controlled to read from the disk device 11D. A server-side computer 10D for transferring the parity data to the client-side computer 13 constantly or in response to a request from the client-side is provided.

Thus, the client computer 13
Converts the small piece data received from the server-side computers 10A, 10B, 10C into a parity data disk device 11D.
Thus, the data can be reproduced and output in the stream order by compensating for the received parity data.

For example, as shown in FIGS. 2 and 3, the disk devices 11A, 11B, 11C
Small piece data (striping data) da output from
Server side computer 1 of ta 0-3, data 0-4, and data 0-5
When data data 0-4 sent from 0B is not normally output, the small piece data data 0-3, data 0-4, data received from the parity data disk device 11D in the client computer 13. Exclusive OR of 0-5 (Excl
usive-OR) and the normal data da received from the disk devices 11A and 11C.
With data ta 0-3 and data 0-5, data data 0-4 lost on the stream can be restored.

As described above, the server computers 10A, 10A
When a failure occurs in any of B and 10C, the disk device 1 for parity data, which is an auxiliary computer on the server side
Since the 1D outputs the corresponding parity data as an alternative, the program requested by the client computer 13 can be provided continuously.

The client-side computer 13 also sends small piece data (striping data).
Are sequentially processed based on the position (order) information. When the replacement parity data is sent, the corresponding piece data is used to restore the replacement piece data to obtain the continuous stream information. Can be continued. Thus, the small piece data lost on the client side can be reliably restored, and the reliability of the system can be significantly improved.

[0040]

As described above in detail, according to the present invention, a conventional video server having a plurality of disk devices on a server side and transmitting information for continuous stream reproduction to a client as provided information in accordance with a request from the client. In the system, it is possible to provide a video server system capable of efficiently distributing the load on the server computer in response to requests from a plurality of clients.

According to the present invention, in a conventional video server system having a plurality of disk devices on the server side and transmitting to a client continuous stream reproduction information as provided information in accordance with a request from the client, Even if a failure occurs in a part of the computer on the side, a highly reliable video server system that can continuously supply data of a continuous stream to a client can be provided.

Further, according to the present invention, in a conventional video server system having a plurality of disk devices on a server side and transmitting reproduction information of a continuous stream as provision information to a client in accordance with a request from the client, Even if a failure occurs in some computers on the side, a highly reliable video server system capable of restoring continuous stream data on the client side can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video server system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a video server system according to a second embodiment of the present invention.

FIG. 3 is an exemplary view for explaining data restoration processing of a video server system according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional video server system.

[Explanation of symbols]

10A, 10B, 10C, 10D: server-side computer, 11A, 11B, 11C: disk device (provided information recording / reproducing device), 12: communication line, 13, 13, ... client-side computer, 11D: disk device for parity data .

Claims (11)

[Claims] 1. A video server system for transmitting continuous stream reproduction information to a client as provided information in accordance with a request from a client, comprising: a plurality of server computers; and a plurality of server computers corresponding to the plurality of server computers. A plurality of provided information recording / reproducing devices each having a plurality of divided data areas, and at least one client-side computer connected to each of the server-side computers by line and receiving provided information of a continuous stream, The plurality of provided information recording / reproducing devices, each of which stores continuous stream information in a divided data area in a small piece data unit and records the plurality of pieces of continuous stream information, and the plurality of server-side computers, according to requests from the client-side computers, Access the divided data area from the provided information recording / reproducing device Means for reading out piece data of continuous stream information in stream order and transmitting the piece data to the client computer via a line, wherein the client computer reproduces and outputs piece data received from the plurality of server computers in stream order A video server system comprising: 2. A video server system for transmitting continuous stream reproduction information as provision information to a client in accordance with a request from the client, comprising: a plurality of first server computers; and at least one second server computer. A plurality of first provided information recording / reproducing devices each provided with a plurality of partitioned data areas, provided in correspondence with the plurality of first server-side computers; and A plurality of second provided information recording / reproducing devices having a plurality of correspondingly provided divided data areas; and at least one client-side computer connected to each of the server-side computers via a line and receiving provided information of a continuous stream Wherein the plurality of first provided information recording / reproducing apparatuses each transmit continuous stream information in a data area partitioned into small pieces of data. The second provided information recording / reproducing device disperses and records each piece data of one data area related to each other recorded in the plurality of first provided information recording / reproducing devices by exclusive logic. The parity data of the continuous stream information subjected to the sum operation is recorded in units of small pieces of data, and the plurality of first server-side computers are respectively provided with corresponding first provided information recording / reproduction provided in response to a request from the client-side computer Means for accessing the divided data area from the device, reading out the piece data of the continuous stream information in the order of the stream, and transmitting it to the client-side computer via a line, wherein the second server-side computer comprises: In accordance with a request from a computer, parity data corresponding to small piece data read from the first provided information recording / reproducing apparatus is stream-ordered. Reading, video server system characterized by comprising a means for transmitting to said client computer over the wire. 3. A video server system for transmitting continuous stream reproduction information as provision information to a client in accordance with a request from the client, comprising: a plurality of first server computers; and at least one second server computer. A plurality of first provided information recording / reproducing devices each provided with a plurality of partitioned data areas, provided in correspondence with the plurality of first server-side computers; and A plurality of second provided information recording / reproducing devices having a plurality of correspondingly provided divided data areas; and at least one client-side computer connected to each of the server-side computers via a line and receiving provided information of a continuous stream Wherein the plurality of first provided information recording / reproducing apparatuses each transmit continuous stream information in a data area partitioned into small pieces of data. The second provided information recording / reproducing device disperses and records each piece data of one data area related to each other recorded in the plurality of first provided information recording / reproducing devices by exclusive logic. The parity data of the continuous stream information subjected to the sum operation is recorded in units of small pieces of data, and the plurality of first server-side computers are respectively provided with corresponding first provided information recording / reproduction provided in response to a request from the client-side computer Means for accessing the divided data area from the device, reading out the piece data of the continuous stream information in the order of the stream, and transmitting it to the client-side computer via a line, wherein the second server-side computer comprises: In accordance with a request from a computer, parity data corresponding to small piece data read from the first provided information recording / reproducing apparatus is stream-ordered. Means for reading out and transmitting to the client-side computer via a line, wherein the client-side computer receives the small piece data received from the plurality of server-side computers and received from the first server-side computer as the second piece data. A video server system comprising means for compensating with parity data received from the server-side computer and reproducing and outputting the stream in stream order. 4. A video server system for transmitting continuous stream reproduction information as provision information to a client in accordance with a request from the client, comprising: a plurality of first server computers; and at least one second server computer. A plurality of first provided information recording / reproducing devices each provided with a plurality of partitioned data areas, provided in correspondence with the plurality of first server-side computers; and A plurality of second provided information recording / reproducing devices having a plurality of correspondingly provided divided data areas; and at least one client-side computer connected to each of the server-side computers via a line and receiving provided information of a continuous stream Wherein the plurality of first provided information recording / reproducing apparatuses each transmit continuous stream information in a data area partitioned into small pieces of data. The second provided information recording / reproducing device disperses and records each piece data of one data area related to each other recorded in the plurality of first provided information recording / reproducing devices by exclusive logic. The parity data of the continuous stream information subjected to the sum operation is recorded in units of small pieces of data, and the plurality of first server-side computers are provided with corresponding first provided information recording / reproduction provided in response to requests from the client-side computers Means for accessing the divided data area from the device, reading out the piece data of the continuous stream information in the stream order, and transmitting the data to the client-side computer via a line, wherein the second server-side computer comprises: When an abnormality occurs in one of the server-side computers, the parity data corresponding to the small piece data to be transmitted from the first server-side computer in which the abnormality has occurred. Means for transmitting data to the client-side computer via a line, wherein the client-side computer reproduces small piece data received from the plurality of server-side computers and received from the first server-side computer in stream order. Means for outputting, based on parity data received from the second server-side computer and small piece data received from the first server-side computer, the piece data that cannot be normally received from the first server-side computer. A video server system comprising means for restoring and reproducing and outputting in stream order. 5. A video server system for transmitting continuous stream reproduction information as provision information to a client in accordance with a request from the client, comprising: a plurality of first server computers; and at least one second server computer. A plurality of first provided information recording / reproducing devices each provided with a plurality of partitioned data areas, provided in correspondence with the plurality of first server-side computers; and A plurality of second provided information recording / reproducing devices having a plurality of correspondingly provided divided data areas; and at least one client-side computer connected to each of the server-side computers via a line and receiving provided information of a continuous stream Wherein the plurality of first provided information recording / reproducing apparatuses each transmit continuous stream information in a data area partitioned into small pieces of data. The second provided information recording / reproducing device disperses and records each piece data of one data area related to each other recorded in the plurality of first provided information recording / reproducing devices by exclusive logic. The parity data of the continuous stream information subjected to the sum operation is recorded in units of small pieces of data, and the plurality of first server-side computers are provided with corresponding first provided information recording / reproduction provided in response to requests from the client-side computers Means for accessing the divided data area from the apparatus, reading out the piece data of continuous stream information in stream order, and transmitting the data to the client-side computer, wherein the second server-side computer receives a request from the client-side computer Means for transmitting parity data corresponding to the obtained piece data to the client-side computer via a line, An ant-side computer configured to receive the plurality of server-side computers and reproduce and output the small-piece data received from the first server-side computer in a stream order; When data exists, parity data corresponding to small piece data that cannot be normally received from the second server-side computer is received, and the parity data and small piece data received from the first server-side computer are determined based on the parity data. A means for restoring the small piece data that cannot be received normally and reproducing and outputting the stream data in stream order. 6. The video server system according to claim 1, wherein the small piece data is transferred to the client computer as packet data. 7. The video server system according to claim 2, wherein the small piece data and the parity data are respectively transferred to the client computer as packet data. 8. The provided information recording / reproducing apparatus, wherein control information indicating a stream order is recorded along with the small piece data, and is read out together with the small piece data. 7. The video server system according to 5 or 6. 9. The provided information recording / reproducing apparatus records control information indicating a stream order in association with small piece data or parity data, and reads the information together with small piece data or parity data. The video server system according to 3 or 4 or 5 or 6 or 7. 10. The video server system according to claim 1, wherein the server-side computer has means for outputting control information indicating a stream order in association with the small piece data. 11. The video according to claim 2, wherein the server-side computer has means for outputting control information indicating the order of the stream order in association with the small piece data or the parity data. Server system.