Shulou(Shulou.com)06/01 Report--

At present, enterprises have high requirements for business continuity and data disaster recovery, and the main management objectives are as follows:

1. Provide data security and avoid business risks.

2. Ensure high availability, eliminate unplanned downtime, reduce unplanned downtime, and improve business continuity.

3. Consider the combined scheme to improve the return on investment.

Traditional enterprises have built or are planning business continuity and data disaster recovery systems. Generally speaking, three offline disaster recovery methods are considered:

1. Local disaster recovery: high business availability and read-write separation to improve business continuity

2. Disaster recovery in the same city: taking into account business continuity and data security, and dealing with regional-level

3. Remote disaster recovery: take data security as the goal and deal with regional data risks.

Each way of disaster preparedness has different management objectives, and different schemes need to be adopted to meet the needs.

The Construction Scheme of data disaster tolerance for Enterprises under the traditional Mode

Disaster recovery is a comprehensive system engineering. Disaster preparedness technology involves the specific application of many technologies, such as data replication, data and application switching, data deletion, data encryption and transmission, data storage and so on. In the construction of system disaster recovery, the most important thing is data disaster recovery. At present, the mainstream data disaster recovery modes under the traditional mode are:

1. Database-based logical replication: real-time acquisition of data logs for replication, asynchronous scheme, typical representatives: Shareplex for Oracle, Oracle GoldenGate, MySQL master-slave complex, PostgreSQL logic stream replication

2. Physical replication based on database: replication using physical log, asynchronous scheme, typical representative: Oracle Datagurad,PostgreSQL physical stream replication, SQL Server AlwaysOn

3. Host-based logical volume replication: replicated through TCP/IP network in units of logical volumes. Typical representative: Symantec VVR

4. Storage-based block replication: depending on the transmission network of storage devices, synchronous and asynchronous technologies can be adopted. Typical representatives: EMC,HP,IBM and other storage manufacturers.

The above four methods replicate from the bottom of the application to the upper layer of the application, the amount of data replicated is getting smaller and smaller, the occupation of bandwidth is getting lower and lower, the dependence on hardware equipment is less and less, and the flexibility of replication is higher and higher. Each solution has its own advantages and disadvantages, the database logic replication efficiency is high, the spirit is high, the database can be used double active, but the data consistency can not be completely guaranteed, and it is difficult to maintain. Physical database replication has high requirements for the system environment, requiring the same database version and the same operating system platform, and the standby database can only be opened in read-only mode; logical volumes are inefficient and generally will not be used as a database disaster recovery solution; storage and replication data is consistent and efficient, but the standby database is not available, so it is possible to copy the bad disk blocks of the main database.

Tencent Cloud data disaster recovery construction plan

Tencent Cloud data disaster recovery architecture chart

Tencent Cloud data disaster recovery advantages:

1. High compatibility: support backup data in both virtual and physical environments to cloud successfully, covering mainstream virtual machines, databases, mail systems and unstructured files

2. High performance: hundreds of virtual machines can be backed up at the same time within an hour, TB-level data can be instantly restored in minutes, and 70% storage space can be saved by data re-deletion technology.

3. High protection: use CDP technology to achieve effective protection of the system, support disaster recovery in the same region / different places, support fast recovery from cloud mount, and effectively ensure that the business can be traced back and recoverable.

4. Low cost: no need to purchase additional hardware, greatly reduce costs, and save up to 60% in TCO. At the same time, connect cloud storage to achieve postpaid and flexible billing.

5. Based on Tencent Cloud snapshot technology and mirror technology, quickly realize data backup and transmission between database and virtual machine.

​ 6. Priority to ensure the business system, off-peak transfer backup data, optimized data re-deletion technology, under the premise of ensuring the backup effect, greatly reduce network consumption

7. Integrated hierarchical storage of standard, low frequency and archive to effectively deal with backup data of different business value.

8. Support the master / backup remote location and the multi-backup mechanism of "two places, three centers". There is no cap on the cloud storage space.

The selection of the Construction Scheme of Enterprise data disaster tolerance

No matter how complex the enterprise's business environment is, the core of disaster recovery is to solve the problem of data synchronization and multi-location release of application changes, and formulate disaster recovery strategies according to the requirements of RPO and RTO. The core technology of data synchronization is mainly the way described above, and incremental snapshots are mostly used in application synchronization. Each cloud manufacturer has developed its own data disaster preparedness scheme, and enterprises can choose their own data disaster preparedness plan according to their own application characteristics.

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