JP3431442B2 - Control device and slave control device adding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a continuous data server device and a method for adding a slave control device, which simultaneously responds to access requests for a plurality of continuous data to provide continuous data services such as video and audio.

[0002]

2. Description of the Related Art A continuous data server device that handles continuous data such as video and audio reads out continuous data stored in a storage device and continuously sends the data to a terminal device in real time in synchronization with time. have. Such a continuous data server device stores video data of a plurality of movies and the like, provides video-on-demand which sends out arbitrary video data in response to a request from a terminal, and provides merchandise information by video through a network. Used in fields such as online shopping. Therefore, since the continuous data server device receives requests from a plurality of users at random, it is required to have the ability to send different continuous data to a large number of users at the same time.

A conventional continuous data server device will be described in detail below. One of the conventional continuous data server devices has a structure as shown in FIG. In such a continuous data server device, an access request for continuous data issued by a user or an application program is sent by interprocess communication or communication via a network. The access request is transmitted from the communication control device 706 to the central control device 710 via the bus 720 and accepted. The central controller 710 communicates the requested continuous data read to the appropriate data storage controller 704. The data storage control device 704 transfers the instructed continuous data to the data storage device 7.
02, and writes in the buffer storage device 708. The central controller 710 instructs the communication controller 706 to send out the data on the buffer storage device 708.
The communication control device 706 sends the instructed continuous data to the transfer destination specified in the access request. The central controller 710 is basically composed of a CPU and a memory device, like the electronic computer. The central control device 710 includes a communication device for transmitting an access request, and an access request from a user or an application program is transmitted not by the communication control device 706 but by the communication device of the central control device. A disk device is often used as a data storage device for storing continuous data, but an optical disk, a magneto-optical disk device, or the like may also be used. In addition to disk devices, RAM and EE
A semiconductor memory device such as a PROM may be used.

However, in the continuous data server device having such a configuration, there is only one central control device 710, and when the central control device 710 fails,
There is a fatal drawback that the operation of the continuous data server device stops.

[0005]

Conventionally, in a continuous data server device, there is only one central control device, and when a failure occurs in the central control device, the operation of the continuous data server device stops, which is a fatal drawback. Existed.

The present invention has been made in consideration of the above circumstances, and in order to control a continuous data server device, one or more are connected, one of which is used as a master system and the other is used as a slave system. Provided are a control device of a data server device, and a control device and a method of adding a slave control device, capable of adding a slave control device without affecting the operation of the continuous data server device while the continuous data server device is operating. The purpose is to

[0007]

SUMMARY OF THE INVENTION In order to control a continuous data server device that reads out and sends out continuous data from a data storage unit that stores continuous data, the present invention is directed to a main system controller or a main system control. A controller used as a slave controller for maintaining the same internal state as the device, and only when the controller itself is operating as a master controller for the continuous data server device, the continuous data server device is still available. From another control device that is not operating as a master or slave control device to the master control device to add the other control device as a slave control device to the internal state of the master control device. Means for accepting a request to be sent to the device, and prior to sending the internal state of itself to the other control device when the request is accepted from the other control device by this means A means for deciding, as the transmission timing, a timing capable of ensuring consistency between the internal state of the master control device itself and the internal state of the other control device to be added as a slave control device; And means for sending its own internal state to the other control device in accordance with the timing determined by this means. Preferably, when the device itself is not yet operating as a master or slave controller for the continuous data server device, the request is transmitted so as to reach the master controller for the continuous data server device. Means, means for receiving the internal state sent from the controller of the master system in response to the request sent by the means, and control of the slave system based on the internal state received by the means It may be further provided with a means for performing processing for starting the operation of the apparatus. Preferably, the control of the continuous data server device is repeatedly performed cyclically, and when the control device itself is one of the main system control device and the other control device for the continuous data server device, the internal data server device Prior to the passing of the state, the internal time is synchronized with the main control device for the continuous data server device or the other of the other control devices, and if the self control device is the other control device, The process for starting the operation as the slave control device may be completed within the cycle in which the internal state is received, and the operation as the slave control device may be started from the next cycle. Further, in order to control the continuous data server device that reads out and outputs the continuous data from the data storage unit that stores the continuous data, the present invention sets the same internal state as the main system control device or the main system control device. A control device used as a subordinate control device for keeping, when the self-device is operating as either a main control device or a subordinate control device for the continuous data server device, the continuous data server Means for accepting an additional request to add the other control device as a slave control device from another control device that is not operating as a master or slave control device for the device, and the other control Means for returning a response including predetermined identification information indicating itself to the other control device when the addition request is accepted from the device, and the response returned by this means Means for receiving an internal state transfer request from the other control device, and the internal state transfer request received from the other control device by this means include predetermined identification information indicating the self. Only when the internal state of itself is transmitted to the other control device, the internal state of the main system control device itself or the same internal state as the main system control device is set as the timing of the transmission. Means for deciding the timing at which consistency can be ensured between the internal state of the slave control device itself and the internal state of the other control device to be added as a slave control device, and by this means Means for sending the internal state of itself to the other control device according to the determined timing. Preferably, when it is not yet operating as a master or slave control device for the continuous data server device, for all of the master and slave control devices for the continuous data server device , A means for transmitting an addition request to be added as a slave control device, and the same identification information as the predetermined identification information included in the response received earliest after the addition request is transmitted by this means. Means for sending an internal state transfer request for requesting transfer of an internal state to itself including identification information, and the response received earliest in response to the internal state transfer request sent by this means Means for receiving the internal state sent from the control device indicated by the predetermined identification information included in
It may further be provided with means for performing processing for starting the operation as a slave control device based on the internal state received by this means. Preferably, the control of the continuous data server device is performed cyclically and repeatedly, prior to the passing of the internal state,
When the internal time is synchronized between the control devices that pass and receive the internal state, and when the control device itself becomes one of the master or slave control device or the other control device for the continuous data server device, Prior to passing the internal state, the internal time is synchronized with the master or slave control device for the continuous data server device or the other of the other control devices, and the device itself is the other control device. In this case, the process for starting the operation as the slave control device is completed within the cycle in which the internal state is received, and the operation as the slave control device is started from the next cycle. Good. Further, in order to control the continuous data server device that reads out and outputs the continuous data from the data storage unit that stores the continuous data, the present invention sets the same internal state as the main system control device or the main system control device. The first control device used as the subordinate control device to be maintained is added as the subordinate control device while the second control device, which is the present main system for the continuous data server device, is operated. A method for adding a system control device, wherein the second control device is controlled by the first control device which is not yet operating as a master or slave control device for the continuous data server device. In order to add the device as a slave control device, a request to send the internal state of the master control device to the first control device is accepted, and the second control device that accepts the request is Second Prior to sending the internal state of the control device to the first control device, the internal state of the second control device, which is the master control device, and the slave control device are added as the timing of the sending. The first to be
Of the second control device from the second control device to the first control device according to the determined timing.
The internal state of the control device is transmitted, the first control device receives the internal state transmitted from the second control device, and based on the received internal state, as a slave control device. It is characterized in that processing for starting the operation is performed. Further, in order to control the continuous data server device that reads out and outputs the continuous data from the data storage unit that stores the continuous data, the present invention sets the same internal state as the main system control device or the main system control device. The first control device used as the subordinate control device to be maintained is added as the subordinate control device while the second control device, which is the present main system for the continuous data server device, is operated. A method for adding a system control device, wherein the second control device is controlled by the first control device which is not yet operating as a master or slave control device for the continuous data server device. Accepting an addition request to add the device as a slave control device, the second control device receiving the addition request sends the internal state of the second control device to the first control device. Ahead Therefore, as the timing of the transmission, the consistency between the internal state of the second control device as the master control device and the internal state of the first control device to be added as the slave control device Is determined, and the second control device transfers to the first control device,
According to the determined timing, the internal state of the second control device is transmitted, and the first control device causes the second control device to transmit the internal state of the second control device.
Receiving the internal state sent from the control device, and performing processing for starting the operation as the slave control device based on the received internal state. Preferably, the control of the continuous data server device is performed cyclically and repeatedly, and prior to the transfer of the internal state, an internal time between the first control device and the second control device is changed. In synchronization, the first control device
The process for starting the operation as the slave control device may be completed within the cycle in which the internal state is received, and the operation as the slave control device may be started from the next cycle. Further, in order to control the continuous data server device that reads out and outputs the continuous data from the data storage unit that stores the continuous data, the present invention sets the same internal state as the main system control device or the main system control device. The first control device used as a subordinate control device for keeping is a second control device which is the present main system for the continuous data server device and one or a plurality of third controls which are subordinate systems. A method for adding a slave control device, which is added as a slave control device while the device is operating, wherein the first control is not yet operating as a master or slave control device for the continuous data server device. The device sends to all of the second and third control devices an addition request to add the first control device as a slave control device, and the second and third control devices , All of the above When the addition request is received from the first control device, a response including predetermined identification information indicating the control device itself is returned to each of the first control devices, and the first control device is configured to send the addition request. An internal state transfer request for requesting transfer of an internal state to the first control device, which includes the same identification information as the predetermined identification information included in the response received earliest after Of the second and third control devices that have sent out and received the internal state transfer request sent from the first control device, the specific information indicated by the identification information included in the internal state transfer request Prior to sending the internal state of the specific control device to the first control device, the control device sets the internal state of the specific control device, which is the main system control device, or the main system as the sending timing. Same as the control device of And the internal state of the slave control device in the form of the particular controller to maintain the state,
The timing that can ensure consistency with the internal state of the first control device to be added as a slave control device is determined, and the determined timing is determined from the specific control device to the first control device. According to the above, the internal state of the specific control device is transmitted, the first control device receives the internal state transmitted from the specific control device, and the slave system control is performed based on the received internal state. It is characterized in that processing for starting the operation as a device is performed. Preferably, the control of the continuous data server device is repeatedly performed cyclically, and synchronization of internal time is performed between the first control device and the specific control device prior to transfer of the internal state. Then, the first control device completes the processing for starting the operation as the slave control device within the cycle in which the internal state is received, and from the next cycle, as the slave control device. The operation of may be started.

[0008]

[0009]

[0010]

[0011]

[0012]

According to the present invention, the consistency of the internal states of the master control device and the slave control device is maintained sequentially, the connection request is transmitted from the newly added control device, and the control accepting the request is performed. The device transmits its own internal state to the requesting control device, and starts operation as a slave system based on the transmitted internal state.

As described above, according to the present invention, by adding the function of adding the central control device to the central control device, the central control device can be added without stopping the continuous data server device itself. High reliability of the continuous data server device can be achieved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment of the present invention, the central control device of the continuous data server device (see FIG. 1) is controlled by an external request receiving unit, an external request receiving unit, an external request sending unit, a scheduler, and a control unit from another central control device. Command sending unit,
A control command receiving unit, a timer, a failure detecting unit, a central control unit addition request receiving unit, an internal state sending unit, an identifier managing unit, a time synchronizing unit, an internal state sending timing managing unit, and a control unit that controls all of these. (See Figure 2).

In a continuous data server device having one master central control device and zero or more slave central control devices of such a configuration, a central control device addition request is issued to the master central control device, By sending the internal state of the main system central control unit at an appropriate timing, the internal state of the central control unit you want to add can be made the same as the internal state of other central control units, and the continuous data server The central control unit can be added to the continuous data server device without stopping the operation of the device.

The present embodiment will be described in more detail below. First, the basic configuration of this embodiment will be described.
FIG. 1 shows the configuration of a continuous data server device according to this embodiment.

The continuous data server device of this embodiment has n
(N is an integer of 1 or more) data control storage devices 14, one or more data storage devices 12 are connected to each data storage control device 14, and m (m is an integer of 1 or more) communication control devices 16 , A buffer storage device 18 connected to each data storage control device 14 and each communication control device 16, a k connected to each data storage control device 14 and each communication control device 16 by one or more transmission lines (k is 1 The central control device 20 of the above integers is provided. It should be noted that, of the central control devices 20, one is set as the master central control device 20, and when another central control device 20 is connected, all of them are set as the subordinate central control devices 20.

The data storage device 12 is for storing continuous data such as video and audio, and a disk device such as a magnetic disk device, an optical disk device, or a magneto-optical disk device can be used. In addition to the disk device, various devices such as a semiconductor memory device such as RAM or EEPROM can be used.

Each of the data storage control devices 14 has one
More than one data storage device 12 is connected, and the continuous data stored in the data storage device 12 is read according to the control of the central control device 20 and is written in the designated address of the designated buffer storage device 18. .

The buffer storage device 18 is for temporarily storing the continuous data transferred from the data storage control device 14. The communication controller 16 is a central controller 20.
Under the control of, the continuous data is read from the designated address of the designated buffer storage device 18 and sent to a communication path such as a network. The destination is 1
One or more may be used.

The central control unit 20 controls the entire system, and, for example, like an electronic computer,
The function can be obtained by executing a program, which is composed of a CPU, a memory device, and a communication device, and which describes control of the entire system.

In order to control the entire system, the central control unit 20 specifies, for example, a bit rate, specifications of each continuous data stored in the system, an arrangement state of each continuous data in the data storage device 12, and each continuous data. All the information in the system such as the communication path to which the communication control device 16 can be connected is managed or known.

The central control unit 20 accepts a continuous data access request from a user or an application program transmitted by means such as communication via a network, inter-process communication, procedure call or remote procedure call, and responds to the request. The data storage control device 14 and the communication control device 16 used for responding are examined, and the data storage control device 14 is asked, "Which data storage device 1?
2 which continuous data stored in 2 is transferred to which address of the buffer storage device 18 ”, and the communication control device 16 is instructed to“ where in the buffer storage device 18 the continuous data is stored. Do you want to send? ”

FIG. 2 shows the configuration of the central control unit 20 in the continuous data server device according to this embodiment. The central control device 20 of this embodiment includes a first external request receiving unit 201 that receives a request for continuous data from the outside and an external request sending unit that sends the received external request to another central control device. 204, a second external request receiving unit 205 for receiving data from the external request sending unit 204 of another central control unit 20, reading of continuous data from the data storage unit 12 and buffer storage for the data storage control unit 14. A scheduler 202 for determining a write operation control command to the device 18, a control command for reading continuous data from the buffer storage device 18 to the communication control device 16, and a control command for sending operation to the communication path, the data storage control device 14, and communication control A control command transmission unit 203 for transmitting a control command to the device 16 and a control command transmitted from another central control device 20 Control command receiving unit 206, a central control unit addition request receiving unit 330 that receives a request to add the central control unit 20, and an internal state transmission that sends the internal state required to add the central control unit 20. Part 331,
An identifier management unit 332 that manages the identifiers of all the central control devices 20 in the continuous data server device and a time synchronization unit 33 that synchronizes the internal time of all the central control devices 20.
3, an internal state transmission timing management unit 334 that notifies appropriate timing of transferring the internal state, a timer 207 for performing time management, a failure detection unit 208 that detects a failure of another central control device 20, and And a control unit 200 that controls everything.

The first external request receiving unit 201 for receiving a request from the outside has a queue for accumulating the received request, and receives the request from the outside independently of the other parts of the central control unit 20. Then, the received external request is stored in the queue, and the external request sending unit 20 is instructed by the control unit 200.
4 has a function of sending the external request stored in the queue to another central control unit 20 and a function of passing it to the scheduler 200.

The external request sending unit 204 combines the external request stored in the queue of the external request receiving unit 201 with an identifier that is uniquely determined, and all other slave central control devices 20.
It has a function to send to. FIG. 3 shows an example of the format of the external request transmitted. Even if there is no external request received in this cycle, an empty external request is sent. The transmission of the external request may be performed for each slave central control device 20, or all the slave central control devices 2 may be transmitted.
You may go to 0 at once.

The control command receiving unit 206 receives the control command issued by the other central control unit 20, and notifies the control unit 200 of the reception. Where scheduler 2
The control command issued by the one-time operation determination process by 00 may be one or a plurality of cases. In the case of a plurality of control commands, the control unit 200 receives all control commands.
To notify.

When the predetermined time is reached, the timer 207 notifies the control unit 200 through means such as an interrupt to start the operation of the central control unit 20.
The control unit 200 sets the time of this timer.

The internal state sending unit 331 sends the internal state of the central control unit 20 to the designated central control unit 20 according to an instruction from the control unit 200. The identifier management unit 332 holds information regarding the identifiers of all the central control devices 20 in the continuous data server device. Control unit 2
When an instruction for assigning an identifier comes from 00, the identifier is assigned so as not to overlap with the existing identifier.

The time synchronizing section 333 synchronizes the internal times of all the central control units 20. Time synchronization can be done, for example, by
It is possible to synchronize by using the NTP protocol via the communication path.

The internal state transmission timing management unit 334 is
Determines the timing of sending the internal state. When the appropriate timing for sending the internal state comes, the control unit 200
To notify.

The control section 200 controls the central control unit 20 as a whole. Here, the normal operation of the central controller 20 and the operation when a failure occurs will be briefly described.

FIG. 4 shows an example of operation timing of the central controller 20. As shown in this figure, the central controller 2
0 repeats the same operation periodically in normal times. That is, in a certain cycle, the main system central controller 20
First, a control command is issued to each data storage control device 14 and each communication control device 16. After the issuance of the control command is completed, the received external request is transmitted to the slave central control device 20 and is also passed to the scheduler 202. The scheduler 202 creates a control command to be transmitted next based on the passed external request. In addition, the slave central control device 2
0 does not actually send a control command to the outside as long as it is judged that the main system is normal, but when the main system failure is detected while keeping the internal state the same as the main system, the main system is immediately sent. In order to enable the transfer, the external request received from the main system is passed to the scheduler 202, and the control command to be transmitted next is created. Further, the slave central control device 20 monitors the occurrence of a failure in the master system at an appropriate timing in each cycle.

On the other hand, when a failure occurs, the period τ in FIG. 4 (or period τ + a predetermined period; when the control commands for a plurality of periods are accumulated in the data storage controller 14 or the communication controller 16), Performs processing to shift the subordinate system to the master system.

For example, the slave central control device 20 monitors the transmission status of at least one of an external request and a control command (predetermined) from the master system, and the master system sends the information. When it is determined that a failure has occurred in the main system, the control command created in the own device is transmitted to the data storage control device 14 and the communication control device 16. Further, the slave central control device 20 operates as a master when a failure of the master is detected and when a predetermined condition is satisfied (for example, when the identification number of the own device is the smallest or from another slave). (If not transmitted), thereafter, the fact that the device itself operates as the main system is notified to another central control device 20, and the operation shifts to the operation as the main system.

As described above, the slave system monitors the occurrence of a failure while keeping the internal state the same as that of the master system. Therefore, even if a failure occurs in the master system, the slave system that detects the failure becomes the master system. Instead, the control command can be transmitted to the data storage control device and the communication control device, the interruption of the operation of the data storage control device and the communication control device can be avoided, and thereby the continuity of the service of continuous data can be guaranteed. Become.

Various control procedures can be considered depending on the policy, from the occurrence of a failure in the main system, the detection by the slave system, to the restoration to normal conditions. Even such a control procedure can be applied.

Now, the central control unit 20 is added during operation of the continuous data server unit for the reason of adding a new central control unit 20 or reconnecting and using the central control unit 20 recovered from the failure. In this case, the internal state of the operating central control unit 20 may be transferred to the central control unit 20 to be added so that the internal state becomes the same. However, this additional processing shall be performed during normal operation when the main system is operating normally.

As described above, the central control unit 20 periodically repeats the same operation in the normal state, but the period τ in each cycle of FIG. 4 (in the next cycle after the scheduler 202 completes the creation of the control command) During the period τ) before entering, the central controller 20 is in the state of stopping the operation. While the central controller 20 is not operating, the internal state is not updated. If the internal state is sent at this time, the internal state is correctly transmitted, and each central controller 20 can be transmitted. The internal state will be consistent between them.

FIG. 5 shows the operation algorithm of the main system central controller 20, and FIG. 6 shows the operation algorithm of the central controller 20 to be added. Note that, here, the central control device 20 that transfers the internal state is assumed to be the main system central control device 20.

Upon receiving the notification from the central control unit addition request receiving unit 330, the main system central control unit 20 activates the identifier management unit 332 and assigns an identifier to the newly added central control unit 20 ( (Step S111), the internal state sending unit 331 returns its own address and the assigned identifier (Step S112). Then, the time synchronization unit 333 is activated to synchronize the times of the main system central control device 20 and the added central control device 20 (step S11).
3).

Next, waiting for an internal state transfer request from the central control unit 20 to be added (step S114),
When a transfer request is received, the internal state transmission timing management unit 334 is activated through the control unit 20 (step S11).
5). The control unit 20 waits for a notification from the internal state transmission timing management unit 334 (step S116), and when the internal state transmission possible notification is received, the internal state transmission unit 331 is activated to check the internal state of the central control device 20. The data is transferred (step S117). The internal state to be transferred includes the number of data storage control devices 14 connected to the continuous data server device, the number of communication control devices 16, the external request being received, the internal state of the scheduler 202, and the like.

On the other hand, the central control device 20 to be added first transmits a central control device addition request to all the central control devices 20 (step S121). This transmission can be realized, for example, by IP-connecting all the central control devices and using the UDP broadcast function. Main system central controller 20 From main system central controller 20
If the address and the identifier of is sent (step S1
22), and activates the time synchronization unit 333 to synchronize the times of the main system central control device 20 and its own central control device 20 (step S122).

Next, an internal state transfer request is sent to the main system central controller 20 (step S123). When the internal state has been received (step S124), the received internal state is reflected in the internal state of itself (step S1).
25), and stands by as the slave central control device 20 (step S126).

The above procedure is a method in which the main system central control unit 20 transfers the internal state. However, the internal control of the central control unit 20 which returns the earliest response to the request from the central control unit 20 to be added. A method of transferring the state is also possible.

FIG. 7 shows an operation algorithm of the central controller 20 for transferring the internal state in this case. The central control devices 20 of the master system and the slave systems are all the central control device addition request receiving unit 3
When there is a notification from 30, the identifier management unit 332 is activated to assign an identifier to the newly added central control device 20 (step S131), and the internal state sending unit 331 is executed.
Through, returns its own address and the assigned identifier (step S132).

Next, when an internal state transfer request is received from the central control unit 20 to be added (step S133),
The address of the central controller included therein is compared with its own address (step S134). FIG. 8 shows a configuration example of the internal state transfer request.

If they are the same (step S
135), the time synchronization unit 333 is activated to synchronize the time of the central control device 20 with the central control device 20 to be added (step S116), and the internal state transmission timing management unit 334 is activated through the control unit 20 (step S11).
7). Then, it waits for a notification from the internal state transmission timing management unit 334 via the control unit 20 (step S11).
6) When the notification indicating that the internal state can be sent is received, the internal state sending unit 331 is activated to transfer the internal state of the central controller 20 (step S138).

If they are not the same, the identifier included in the internal state transfer request is notified to the identifier management unit 332 and registered (step S1310). Next, FIG. 9 shows an operation algorithm of the added central controller 20.

First, a central controller addition request is transmitted to all central controllers 20 (step S14).
1). Central controller 2 from any central controller 20
If the address and identifier of 0 are sent (step S
142), and sends the internal state transfer request shown in FIG. 8 to all the central control units (step S143).

Next, the time synchronizing section 333 is activated to synchronize the time of the central control device 20 with which the internal state is sent with the central control device 20 of interest (step S144).
After waiting for the internal state to be transferred, when the internal state has been received (step S145), the received internal state is reflected in its own internal state (step S146), and the slave central control device 20 stands by. (Step S14
7).

As described above, according to this embodiment, by adding the function of adding the central control device to the central control device, the central control device can be added without stopping the continuous data server device itself. It is possible to achieve high reliability of the continuous data server device. The present invention is
The present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope of the invention.

[0054]

According to the present invention, by adding the function of adding a central control unit to the central control unit, it becomes possible to add the central control unit without stopping the continuous data server device itself, and the continuous data can be added. The server device can be made highly reliable.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of a continuous data server device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of a central control device of the continuous data server device according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration example of an external request to be transferred.

FIG. 4 is a diagram showing an operation timing example of the central control unit of the continuous data server device according to the embodiment of the present invention.

FIG. 5 is a flowchart showing an operation example of the main system central control device according to the embodiment of the present invention.

FIG. 6 is a flowchart showing an operation example of a central control unit to be added according to the embodiment of the present invention.

FIG. 7 is a flowchart showing an operation example of the central control device according to the embodiment of the present invention.

FIG. 8 is a diagram showing a configuration example of an internal state transfer request according to the embodiment of the present invention.

FIG. 9 is a flowchart showing an operation example of the central control unit to be added according to the embodiment of the present invention.

FIG. 10 is a diagram showing an example of a conventional continuous data server device.

[Explanation of symbols]

12 ... Data storage device 14 ... Data storage control device 16 ... Communication control device 18 ... Buffer storage device 20 ... Central control unit 200 ... Control unit 201 ... External request receiving unit 202 ... Scheduler 203 ... Control command sending unit 204 ... External request sending unit 205 ... External request receiving unit 206 ... Control command receiver 207 ... timer 208 ... Fault detection unit 330 ... Central control unit addition request receiving unit 331 ... Internal state sending unit 332 ... Identifier management unit 333 ... Time synchronization unit 334 ... Internal state transmission timing management unit

Front page continued (72) Inventor Seiji Maeda 1 Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Research & Development Center Co., Ltd. (72) Inventor Osamu Torii 1 Komukai-shiba, Kawasaki-shi, Kanagawa Stock Corporate Toshiba Research and Development Center (56) References JP-A-9-138755 (JP, A) JP-A-57-6958 (JP, A) JP-A-2-71354 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G06F 11/16-11/20 G06F 13/00 G06F 15/00 G06F 15/16-15/177

Claims (10)

(57) [Claims] 1. A from the data storage unit for storing the continuous data for controlling a continuous data server apparatus for delivering reading the continuous data, the controller or the main system controller of the main system
Used as a slave control device that maintains the same internal state as
Which is a main control device for the continuous data server device.
The continuous data only when operating as
Operates as a primary or secondary control device for the server device
From another control device that is not
Inside the control device of the main system to be added as a control device
A hand that accepts a request to send the status to the other control device.
When accepting the stage, it said request from said another control device by this means, be transmitted to the internal state of itself to the another controller
Prior to the transmission , the timing of the transmission is added to the internal state of the master control device itself and the slave control device.
Means for determining the guarantee can filter timing consistency between the internal state of the other control device to be pressurized, in accordance with the timing determined by this means, the internal state of itself to the other control device A control device comprising means for sending out . 2. The device itself is still compatible with the continuous data server device.
When not operating as a master or slave controller
A main controller for the continuous data server device
Means for sending the request so as to reach the main system and the main system in response to the request sent by the means.
Means for receiving the internal state sent from the control device of
And a slave system based on the internal state received by this means.
To perform the processing to start the operation as the control device of
The method of claim 1, further comprising a step.
Control device. 3. The control of the continuous data server device is repeatedly performed periodically, and the control device of the main system for the continuous data server device itself is controlled.
Storage device or one of the other control devices , prior to the transfer of the internal state, the continuous data server device
Control device for the main system or the other of the other control devices
And the internal time is synchronized with each other , and when the control device itself is the other control device, the slave system control
The process for starting an operation as a device is completed within a cycle in which the internal state is received, and the operation as a slave control device is started from the next cycle.
The control device according to 1. 4. A data storage unit for storing continuous data
Continuous data server device for reading and sending continuous data
For controlling the main system control device or main system control device
Used as a slave control device that maintains the same internal state as
Which is a main control device for the continuous data server device.
When operating as either a stand-alone or a subordinate control device, the main system for the continuous data server device or the
Is it another control device not operating as a slave control device?
Should add the other control device as a slave control device.
Receiving means for receiving an additional request, the additional request from said another control device by this means
In the case of hitting, a response containing predetermined identification information that identifies itself
To the other control device, and the other device that receives the response returned by this device.
Means for receiving an internal state transfer request from the control device, and the internal unit received from the other control device by this means.
The copy status transfer request includes the predetermined identification information indicating itself.
If it is rare, the internal state of its own
Prior to sending to the device
Control of the main system or the internal state of the main system itself
It is a slave control device that maintains the same internal state as the device.
Internal state and other controls that should be added as slave control devices
Timing that can guarantee consistency with the internal state of the device
According to the means for determining the group and the timing determined by this means.
Means for sending the internal state of itself to the other control device,
A control device comprising: 5. The device itself is still compatible with the continuous data server device.
When not operating as a master or slave controller
A main controller for the continuous data server device
And control all slave control devices
A means for sending an addition request to be added as a device, and the earliest after the addition request is sent by this means
The predetermined identification information included in the received response and
Transfers the internal state to itself including the same identification information.
Means for transmitting the requested internal state transfer request and response to the internal state transfer request transmitted by this means
And before being included in the earliest received response
Before being sent from the control device indicated by the predetermined identification information
Means for receiving an internal state, and a slave system based on the internal state received by this means
To perform the processing to start the operation as the control device of
The method of claim 4, further comprising a step.
Control device. 6. The control of the continuous data server device is periodic.
The internal state is transferred prior to the transfer of the internal state.
The internal time is synchronized between the control devices performing the transfer, and the control device itself transfers data to the continuous data server device.
When it becomes one of the subordinate control device or the other control device
In this case, prior to the passing of the internal state, the continuous data
Main or slave control device for the data server device or
Synchronizes the internal time with the other controller.
Take the case itself is the other control device, the control of the slave
The process for starting the operation as a device is the internal state
Received within the cycle received, the slave system is controlled from the next cycle.
6. The operation as a device is started.
The control device according to 1. 7. A main system control device or a main system control device for controlling a continuous data server device for reading out and transmitting the continuous data from a data storage section for storing the continuous data.
Used as a slave control device that maintains the same internal state as
A first control device for the continuous data server device
Operating the second control device that is the current of the main system Sasetama
Up, a slave controller adds <br/> adding a slave controller, the second controller is still the continuous data server apparatus
Is not operating as a master or slave controller for
From the first control device to the other control device as a slave control
Internal state of the control device of the main system to be added as a device
Accepting a request to be sent to the first control device, the accepted the request second control device, the second
For sending the internal state of the control device to the first control device
Prior to the transmission timing, the main system controller
And the internal state of the second control unit upcoming, the slave controller
To determine the security can filter timing consistency between the internal state of the control apparatus of the first to be added, the second control
From the device to the first controller , the determined timing
The second controller, the internal state of the second controller is transmitted, and the first controller transmits the internal state of the second controller.
Receiving said internal status, slave controller adds wherein the process performing the for starting the operation as a slave controller on the basis of the internal state received that. 8. The control of the continuous data server device is periodically repeated, and prior to the transfer of the internal state, an internal operation is performed between the first control device and the second control device. take the time synchronization, the first control unit, processing for starting the movement <br/> operation as a control device of the slave is not completed within the period which has received the internal state, the following The method of adding a slave control device according to claim 7 , wherein the operation as a slave control device is started from a cycle. 9. A data storage unit for storing continuous data
Continuous data server device for reading and sending continuous data
For controlling the main system control device or main system control device
Used as a slave control device that maintains the same internal state as
A first control device for the continuous data server device
It becomes the second control device and the slave system that are the current master system.
Keeping one or more third control devices running
Then, how to add a slave controller to add as a slave controller
However , it is still a primary or secondary system for the continuous data server device.
The first control device not operating as a control device is
For all of the second and third control devices, the first
An additional request to add the controller as a slave controller
And the second and third control devices both send the first
When the additional request is received from the control device, the control
The response including the predetermined identification information indicating the device itself
Each of them is returned to the control device, and the first control device returns to the control device after sending the addition request.
The predetermined identification included in the response received as soon as possible
To the first control device including the same identification information as the information
Send internal state transfer request to request transfer of internal state of
The internal state transfer request sent from the first control device.
Of the second and third control devices that have received the request
Identification indicated by the identification information included in the copy status transfer request
Of the control device of the specific control device is the internal state of the first control device.
Prior to sending to the control device of the
As the main control unit, inside the specific control unit
Status or a slave system that maintains the same internal state as the master controller
The internal state of the specific control device that is the control device and the control of the slave system
The internal state of the first control device to be added as a control device
Between the specific control device and the first control device.
According to the timing, the internal state of the specific control device
The first control device sends the status from the specific control device.
The received internal state, and based on the received internal state
Process to start the operation as a slave control device
A method for adding a slave control device, which comprises: 10. The control of the continuous data server device is a cycle.
It is intended to be and repeatedly performed, prior to delivery of the internal state, the first control instrumentation
Internal time between the device and the specific control device.
Ri, said first controller, movement of the control device of the slave
The process for starting the work is within the cycle in which the internal state is received.
The operation as a slave controller is started from the next cycle.
The slave system according to claim 9, wherein the work is started.
How to add a device.