On CDP's past and present

I. The birth of CDP

CDP (continuous data protection), literally, is a continuous data protection. Continuous means continuous execution. There are many understandings of one thing. For example, running for 50 minutes every day is a type of continuous exercise. For example, if you are doing well, doing well is a continuous virtue. But running is good or doing well. Although it is continuous, there is an interval between the two, not always running, or always doing well.

Therefore, the earliest concept of CDP is to protect data every day and back up data every day. There are no more subdivided indicators. So before and after 2005, IBM's TSM product shouted: data protection is only performed once for seven days, but every day, CDP is required! This can be said to be the earliest proposal of the CDP concept. In this case, it is applied to the data backup field as a scheduled backup with an obvious backup interval and a backup time window.

Ii. Evolution of CDP

With the advent of the big data era, people have entered the age of information consumption. Information Data is inseparable from everyone, which makes data security an unprecedented level. In this way, if there is still a backup interval window for data backup, it will lead to data loss within the backup interval. The larger the interval, the more data is lost! This is not allowed in the Information Consumption Age.

This requires shortening the backup window and reducing the backup interval to reduce data loss. The ideal state is Zero loss, which means that the backup interval is 0, that is, there is no backup window.

To better express this CDP state, two concepts are introduced: RPO and RTO.

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RPO (rediscovery Point Object): recovery point objective, refers to the amount of data that will be lost in the event of a disaster, that is, the backup interval.

RTO (recovery time object): the recovery time objective, which refers to the time when the business can continue to operate in the event of a disaster, that is, the recovery time.

With these two standards, the new CDP concept will back up a new interpretation, and it must be RPO = 0, RTO approaches 0 to become CDP. To distinguish this new concept from CDP a few years ago, the industry officially called the previous CDP concept near CDP (quasi CDP ), the new concept is true CDP ).

Iii. CDP international standards

I have to mention an organization that has been focusing on CDP. It is snia. The Global Network Storage Industry Association (snia) is an industry association that was established earlier and neutral to storage manufacturers, the purpose is to lead the development and promotion of standards, technologies and training services in the storage industry around the world and enhance the organization's information management capabilities.

As a non-profit industry organization, it has more than 420 company members from around the world and more than 7,100 individual members throughout the storage industry. Its members include different vendors and users, voting core members include Dell, IBM, netapp, EMC, Intel, Oracle, Fujitsu, Juniper, Qlogic, HP, LSI, Symantec, Hitachi, Microsoft, VMWare, Huawei Symantec 15th home, there are more than other members. From the composition of the members, we can see that the core members are from the core storage vendors. Therefore, snia is the leading organization in the storage industry.

Snia established a five-member CDP research team in 2005. This team lasted six years and published a research document in 2011, giving CDP a more detailed and accurate concept, clearly states which are not CDP.

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What is CDP:1. Back up data when changes occur. 2. Back up data to another place. 3. Restore data to any point in time.

CDPYou can:1. Zero data loss; 2. Any time point rollback; 3. fast recovery; 4. Full-time protection.

Implementation of CDP:1. Block-based; 2. file-based; 2. Application-based.

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What is CDP:

1Replication is not CDP:Synchronous replication only contains one copy of data and only a limited number of snapshots.

2Snapshot is not CDP:There is a time interval between snapshots; data may be lost between two snapshots; frequent reading of the operating system; lack of embedded associations between data, files, applications, and systems.

3Regular backup is not CDP:Specifies the backup plan; regular log backup.

From this document, we can clearly define CDP: Real-time backup, Remote Disaster Tolerance, and any point in time rollback (any point in time ).

Iv. CDP manufacturers in China

According to the international definition of CDP, the most difficult one is to roll back at any point in time. For structured database data, not only can rollback at any point in time, but also can ensure that each point that can be rolled back is an available effective point. This is based on the knowledge of the physical structure and internal logic structure of the database!

Beijing Hutchison Yiyi Technology Co., Ltd. has been developing a powerful analysis model for various mainstream database versions in windows, Linux, and UNIX for ten years. It has obtained the internal physical structure, the logical relationship is analyzed to ensure that 100% of structural data rollback is available! It is currently the only true CDP manufacturer in China.

This article from the "disaster tolerance backup-Hutchison Yi Liu nazhe" blog, please be sure to keep this source http://471014.blog.51cto.com/461014/1534132