CN112596945A

CN112596945A - Disaster recovery method based on double main units

Info

Publication number: CN112596945A
Application number: CN202011375958.0A
Authority: CN
Inventors: 邬玉良
Original assignee: Zhongke Hot Standby Beijing Cloud Computing Technology Co ltd
Current assignee: Zhongke Hot Standby Beijing Cloud Computing Technology Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-04-02

Abstract

The invention provides a disaster recovery method based on double masters, which relates to the field of computer data processing and realizes the disaster recovery method based on double masters.

Description

Disaster recovery method based on double main units

Technical Field

The invention relates to a disaster recovery method based on double masters, and belongs to the field of computer data safety processing.

Background

In recent years, with the development of information methods, enterprises are gradually increasing in information application and requirements, information coverage is increasing, and information is more and more important in life and work of people, so that the information security problem also becomes a key point in the field of computer data security at present. Disaster recovery backup in the modern society has solved the information security problem of the IT industry and has been well popularized.

The disaster-backup system is characterized in that two or more sets of IT systems with the same function are established in different places far away from each other, health status monitoring and function switching can be performed among the IT systems, and when one system stops working due to accidents (such as fire, earthquake and the like), the whole application system can be switched to the other system, so that the functions of the system can continue to work normally. The disaster recovery technology is a component of the high-availability technology of the system, and the disaster recovery system emphasizes the processing of the influence of the external environment on the system, particularly the influence of a catastrophic event on the whole IT node, and provides a node-level system recovery function.

The technology for enabling the main production end database and the standby machine end database to simultaneously run on line and be in a readable and queryable state in the double-main disaster backup, namely the disaster backup system.

The disaster recovery system is divided into a data disaster recovery system and an application disaster recovery system according to the protection degree of the disaster recovery system on the system. Data disaster recovery refers to the establishment of a data system in a different location, which is a real-time copy of local critical application data. The application disaster recovery is that a set of complete backup application systems (which can be mutual backup) equivalent to the local production system is established in different places on the basis of data disaster recovery, and under the disaster condition, the remote system takes over the service operation rapidly. The data disaster recovery is the guarantee against disaster, and the application of the disaster recovery is the target of the disaster recovery system construction.

Data disaster recovery

The data disaster recovery refers to establishing a data system at a different place, wherein the system is an available copy of local critical application data. When the local data and the whole application system have disasters, the system at least stores a piece of available data of key services in different places. This data may be a full real-time copy of the local production data, or may be slightly behind the local data, but must be available. The main technologies used are data backup and data replication technologies.

The method for applying disaster recovery is to establish a set of complete backup application systems (which can be mutual backups) equivalent to a local production system in different places on the basis of data disaster recovery. The set-up of such a system is relatively complex, requiring not only a copy of the available data, but also resources including network, host, application, and even IP, and good coordination between the resources. The main technologies include load balancing and clustering technologies. The data disaster recovery is a technology of application disaster recovery, and the application disaster recovery is a target of the data disaster recovery.

When the structure of the disaster recovery system is selected, a multi-level wide area network fault switching mechanism is also established. The local high-availability system means that in the case that a plurality of servers run one or more applications, when any fault occurs to any server, the running application cannot be interrupted, and the application programs and the system should be quickly switched to other servers to run, namely, the local system cluster and the hot backup.

In a remote disaster recovery system, to implement complete application disaster recovery, the system should include a security mechanism of a local system and a remote data replication mechanism, and also have a remote fault switching capability and a fault diagnosis capability in a wide area network range.

The cluster system is formed by running high-reliability software on the basis of a redundant common availability system. The high-reliability software is used for automatically detecting the running state of the system, and automatically transferring the set service to another server in the case of failure of one server. When the service provided by the operating server is unavailable, the backup server automatically takes over the work of the operating server without restarting the system, and when the operating server is recovered to be normal, the service is switched to the operating service to operate in an automatic or manual mode according to the setting of a user. The backup server may execute other applications in addition to taking over its services when the active server fails.

Depending on these factors and different applications, disaster backup is typically divided into four levels.

Stage 0: without a backup center

The primary disaster recovery backup has no disaster recovery capability, only carries out data backup locally, and the backed-up data is only stored locally and is not sent to a different place.

Stage 1: local tape backup, off-site storage

And backing up the key data locally and then sending the key data to a remote place for storage. And after the disaster happens, recovering the system and the data according to a preset data recovery program. This solution is low cost and easy to configure. However, when the amount of data increases, there is a problem that the storage medium is difficult to manage, and when a disaster occurs, there is a problem that a large amount of data is difficult to recover in time. To solve this problem, when a disaster occurs, critical data is restored first, and then non-critical data is restored.

Stage 2: hot backup site backup

And establishing a hot backup point in different places, and backing up data through a network. That is, the data of the primary site is backed up to the backup site in a synchronous or asynchronous manner through the network, and the backup site generally only backs up the data and does not undertake the service. When a disaster occurs, the backup site takes over the service of the primary site, thereby maintaining the continuity of service operation.

Stage 3: movable standby center

Two data centers are respectively established at remote places, are in working states and carry out mutual data backup. When a disaster occurs in one data center, another data center takes over its work tasks. The backup of this level can be divided into two types according to the actual requirement and the amount of invested funds: firstly, mutual backup of key data is limited between two data centers; and the two data centers are mirror images of each other, namely zero data loss and the like. Zero data loss is the most demanding backup mode at present, and it requires that the system can ensure the safety of data no matter what disaster happens. Therefore, it requires complex management software and dedicated hardware devices, requiring relatively maximum investment, but also the fastest recovery speed.

Disclosure of Invention

The invention aims to realize double main disaster recovery, data is processed and stored, so that the data is consistent between two storages, and when one storage is damaged, the data can be accessed through the other storage, thereby improving the safety of the data and more effectively protecting the data of a user.

The scheme of the invention is realized by a double-main-based disaster recovery method, which comprises the following steps:

the client application program sends out a write request

Write requests sent to MDC over LAN

MDC processes the request, responds to which disk blocks data are written by the client through LAN by using double main disaster backup method

The client side directly writes the data into the storage at a linear speed, and synchronously copies the data to the disaster recovery center to realize double-main disaster recovery.

Drawings

Fig. 1 is a schematic diagram of a disaster recovery application with two main systems.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention aims to realize the dual main functions of data storage, data is processed and stored, so that the data is consistent between two storages, and when one storage is damaged, the data can be accessed through the other storage, thereby improving the safety of the data and more effectively protecting the data of a user.

The method comprises the following steps:

the client application program sends out a write request

Write requests sent to MDC over LAN

The MDC processes the request, responds to which disk blocks the client writes data to through the LAN using dual-master technology

Claims

1. A disaster recovery method based on double main is characterized in that a writing request is sent to a software modem through a network;

the software modem processes the request, and responds to which disk blocks the client writes data through the network by using a double-active technology;

the client side directly writes the data into the storage at a linear speed, and synchronously copies the data to the disaster recovery center to realize double-activity disaster recovery.

2. A dual master based disaster recovery method as claimed in claim 1 wherein the sending of the write request to the software modem over the network means that the user issues the request.

3. A dual-master-based disaster recovery method as claimed in claim 1, wherein the software modem processes the request and responds to which disk blocks the client writes data to by using dual-active technology through the network, which means that the database of the production center is backed up to the disaster recovery center by using dual-active technology.