KR100295746B1 - Redundancy Device and Method of Data Storage in ATM Exchange System - Google Patents

Abstract

The present invention relates to an apparatus and method for redundancy of a data storage unit in an Asynchronous Transfer Mode (ATM) exchange system. In particular, the present invention relates to a duplication control unit for duplexing a data storage unit and performing redundancy control and state management of the data storage unit. The present invention relates to a redundancy device and a method of data storage in an ATM switching system.

Conventionally, when the data storage unit fails, all data stored in the failed data storage unit is lost. In addition, when the failed data storage unit is replaced, the entire system is stopped. Therefore, a fatal loss occurs in a system environment requiring online service. .

According to the present invention, while performing the redundancy control of the data storage unit in the redundancy control unit designated as the master, the information on the state change of the data storage unit is transmitted to the slave redundancy control unit to maintain the mirror state, and the slave redundancy control unit analyzes the heartbeat message. When an error of the master redundancy control unit is detected, by switching its state to the master and continuously performing redundancy control and state management for the corresponding data storage unit, stable data management is possible.

Description

Redundancy Device and Method of Data Storage in ATM Switching System

The present invention relates to an apparatus and method for redundancy of a data storage unit in an Asynchronous Transfer Mode (ATM) exchange system. In particular, the present invention relates to a duplication control unit for duplexing a data storage unit and performing redundancy control and state management of the data storage unit. The present invention relates to a redundancy device and a method of data storage in an ATM switching system.

In general, an auxiliary storage device under the control of an ATM switching system includes a plurality of small computer system interface (SCSI) hard disks, that is, a board that includes a plurality of data storage units and a DC-DC converter supplying 12V and 5V power. The configured disk unit (DKU) is used, and the data storage unit is a large-capacity storage device, and stores important data such as system package, dynamic data, remote system data, and billing data, and each has a different SCSI identification number. Store and manage different information.

In the conventional ATM switching system, the DKU is composed of a DC-DC converter and a stable circuit around the DC-DC converter to supply power to a data storage unit attached to a printed circuit board. It consists of a switch that controls the RC and a remote LED (Light Emitting Diode), and there is a SCSI connector on the data storage for connecting the power supply cable and the SCSI cable. ) Is connected to the backboard.

In addition, '-48V' and ground are externally supplied, and have a hardware structure connected to the power connector of the data storage unit through a connector for supplying 12V and 5V, which are outputs of the DC-DC converter, to the DKU.

In addition, the DKU sets a SCSI identification number through a jumper, and four DKUs can be installed in the system.

Each data storage unit of the DKU loses data stored in the event of a power failure or abnormal operation. The conventional ATM switching system does not have a redundancy device capable of mirroring the corresponding DKU and thus loses data. There is a problem.

That is, in the conventional ATM switching system, the control configuration of the data storage unit is as shown in FIG. 1, the operation management processor 11, the SCSI control unit 12, and the plurality of data storage units 13-1 to 13-n. It is provided with.

Here, the operation management processor 11 controls the SCSI control unit 12 to read data necessary during system operation. Accordingly, the SCSI control unit 12 retrieves the SCSI identification number in which the necessary data is stored under the control of the operation management processor 11 and reads data from the corresponding data storage units 13-1 to 13-n.

At this time, the SCSI control unit 12 and the plurality of data storage units 13-1 to 13-n transmit data through one SCSI bus.

However, as the amount of data increases in recent years, when the number and the number of times of writing and reading information in the data storage unit of the switching system become large, a failure occurs in the data storage unit storing the data.

Therefore, if the data storage unit fails, all data stored in the failed data storage unit is lost, and the entire system is stopped even when the failed data storage unit is replaced. Therefore, a fatal loss may occur in a system environment requiring online service. do.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to perform mirroring control of a data storage unit in a duplication control unit designated as a master, and transmit information on a state change of the data storage unit to a slave duplication control unit. When the error occurs in the master redundancy control by detecting the heartbeat message in the slave redundancy control part, it transfers its status to the master and continuously performs redundancy control and state management for the corresponding data storage. It is to enable data management.

1 is a control block diagram of a data storage unit in a conventional ATM switching system.

2 is a block diagram illustrating a redundant configuration of a data storage unit in an ATM switching system according to the present invention.

3 is a view showing a state change of the data storage unit by the master redundant control unit in the ATM switching system according to the present invention.

4 is a view showing a state change of the redundant control unit in the ATM switching system according to the present invention.

<Description of the symbols for the main parts of the drawings>

21: operation management processor 22-1, 22-2: redundant control unit

23-1a to 23-na, 23-1b to 23-nb: data storage unit

24, 25: floating hard disk

Features of the present invention for achieving the above object, the operation management processor is redundant to the operation / standby state to control the system operation; A redundant data storage unit for storing data required during operation of the system; It is to provide a redundancy device of the data storage unit in the AMT exchange system including a redundancy control unit performing data conversion and processing between the operation management processor and the data storage unit, and performing error recovery and redundancy control for the data storage unit. .

Here, the redundancy control unit performs error recovery and mirroring control by performing redundancy control and management in an operation / standby state so that each of the redundant data storage units maintains a mutual mirror state, and the redundancy control unit is redundant. When an error occurs in any one of the duplication controllers, the heartbeat message transmitted from the counterpart duplication controller is analyzed to detect duplication of the duplication control and state management. .

Another feature of the present invention, when the redundant data storage unit is equipped with a process of switching the data storage unit from the initial state to the normal state in the duplication control unit designated as a master and then switching to the operation or standby state respectively; Monitoring a state of the redundant data storage unit and transferring an error state of the data storage unit to a standby state when an error occurs in the data storage unit in an operational state; When the new data storage unit is mounted, the process of copying data stored in the data storage unit transferred to the operating state to the newly mounted data storage unit, and transferring the newly mounted data storage unit to the standby state to perform redundancy control and state management. It is to provide a method of redundancy of the data storage unit in the AT exchange system comprising a.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the ATM switching system according to the present invention, the redundant configuration of the data storage unit is shown in FIG. 2, an operation management processor 21, a redundant control unit 22-1 and 22-2, and a plurality of data storage units ( 23-1a to 23-na and 23-1b to 23-nb are respectively redundant and include a plurality of floating hard disks 24 and 25.

The operation management processor 21 is duplicated in the operation / standby state, and in the operation state, the operation control processor 21 controls the redundancy control units 22-1 to 22-2 through an external SCSI bus to read necessary data during system operation.

The redundancy control units 22-1 to 22-2 are duplicated in an operation / standby state, a SCSI interface for connection with the operation management processor 21 via an external SCSI bus, and a data storage unit 23- via an internal SCSI bus. Performs SCSI interface functions for connecting 1a to 23-na, 23-1b to 23-nb, performs data conversion and processing, and multiple data storage units 23-1a to 23-na, 23-1b. 23-nb) to control the error recovery and redundancy, and to control the floating hard disk (24, 25).

At this time, the operation management processor 21 and the redundancy control unit 22-1 to 22-2 support a SCSI-2 or SCSI-3 type SCSI bus, and the corresponding SCSI termination resistor is provided by the operation management processor 21. Then, an LED (not shown) is attached to check the state of the data storage units 23-1a to 23-na and 23-1b to 23-nb and the floating hard disks 24 and 25. .

The data storage units 23-1a to 23-na and 23-1b to 23-nb are redundant in operation / standby state and provide a mirroring function to prevent data loss, and provide system package, dynamic data and remote system data. And data such as billing data.

The floating hard disk 24.25 is used as a means for simply moving the stored data to another place.

Referring to the redundant control operation of the data storage unit in the ATM switching system according to the present invention configured as described above are as follows.

First, one redundant control unit 22-1 is designated as an operation state, that is, a master, by the operation management processor 21, and another redundant control unit 22-2 is in a standby state, that is, a slave. Assume that it is specified as

At this time, the process according to the state change of one redundant data storage unit 23-1a, 23-1b by the master redundancy control unit 22-1 according to the redundancy control and state management instruction of the operation management processor 21 Referring to Figure 3 attached to the operation as follows.

First, when the redundant data storage units 23-1a and 23-1b are mounted as shown in FIG. 3A, the master redundancy control unit 22-1 designated as the master by the operation management processor 21 is initialized. After the state is changed to the normal state at, the data storage units 23-1a and 23-1b are transferred from the initialization state to the normal state capable of providing a service from the mirror state.

The master redundancy control unit 22-1 monitors the states of the data storage units 23-1a and 23-1b. However, as shown in FIG. If there is an error or detachment, it is notified to the operator through the LED, and if the data storage where the error occurs is in the current operation state, it is transferred to the operation state so that the data service can continue with another data storage unit in standby state. Let's do it.

Subsequently, when a new data storage unit is installed instead of the data storage unit in which an error occurs as shown in FIG. 3C, the corresponding master redundancy control unit 22-1 enters a recovery state and the data storage unit currently operating. The stored data is copied to the newly mounted data storage, and the newly mounted data storage is transferred to the standby state.

According to the above operation, the master redundancy control unit 22-1 performs redundancy control on the data storage units 23-1a and 23-1b, and the state change of the data storage units 23-1a and 23-1b. By transmitting the information to the slave redundancy control unit 22-2, which is another redundancy control unit, and maintaining the mirror state with each other, it is prepared for an error occurrence of the redundancy control unit.

Next, a description will be given of the processing operation according to the state change of the duplication control unit 22-1 and 22-2 with reference to FIG. 4.

First, as shown in FIG. 4A, when an error occurs in the master redundancy control unit 22-1 designated as the master by the operation management processor 21, that is, the redundancy control unit in the operating state, the corresponding master redundancy control unit 22-. 1) becomes a panic state, and the change of this state is performed by another master redundancy controller configured as redundancy in the corresponding master redundancy control unit 22-1, that is, slave redundancy control unit 22 as shown in FIG. By periodically sending the heartbeat message to -2), the slave duplication control unit 22-2 can check the state change of the master duplication control unit 22-1.

That is, when an error occurs in the master redundancy control unit 22-1, the corresponding slave redundancy control unit 22-2 analyzes the heartbeat message transmitted from the master redundancy control unit 22-1 and thereby master master control unit 22-1. When the error occurrence of the) is detected, an error occurrence of the master redundancy control unit 22-1 is notified to the operator through the LED, and the user is transferred as a master, that is, the operating state, and thus the data storage unit 23 as the master redundancy control unit. -1a, 23-1b) continues to perform the redundancy control.

As described above, the present invention transmits information on the state change of the data storage unit to the slave redundancy control unit while maintaining the mirror state while performing redundancy control of the data storage unit in the redundancy control unit designated as a master, and heartbeat in the slave redundancy control unit. When the error occurrence of the master duplication control unit is detected by analyzing the message, by switching its state to the master and continuously performing redundancy control and state management for the corresponding data storage unit, stable data management is possible.

Claims (4)

An operation management processor dualized in an operation / standby state to control system operation; A redundant data storage unit for storing data required during operation of the system; And a redundancy control unit configured to perform data conversion and processing between the operation management processor and the data storage unit, and perform error recovery and redundancy control for the data storage unit. . The AMS exchange of claim 1, wherein the redundancy control unit performs error recovery and mirroring control by performing redundancy control and management in an operation / standby state so that each of the redundant data storage units maintains a mutual mirror state. Redundancy of data storage in the system. 2. The heart of claim 1, wherein the redundancy control unit is redundant, and is transmitted from a state side duplication control unit to enable redundancy control and state management of the duplicated data storage unit even when an error occurs in any one of the duplicated control units. The redundancy apparatus of the data storage unit in the ATM switching system, characterized in that for detecting the error occurs by analyzing the bit message. When the redundant data storage unit is mounted, transferring the data storage unit from an initialization state to a normal state by a duplication control unit designated as a master, and then switching them to an operation or standby state; Monitoring a state of the redundant data storage unit and transferring an error state of the data storage unit to a standby state when an error occurs in the data storage unit in an operational state; When the new data storage unit is mounted, the process of copying the data stored in the data storage unit transferred to the operation state to the newly mounted data storage unit, and transferring the newly mounted data storage unit to the standby state to perform redundancy control and state management. Redundancy method of the data storage unit in the AMT exchange system comprising a.