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

Disaster recovery backup technology will play a strong role in the event of data loss or major disasters in enterprises. Enterprises do not have to worry about not being able to function properly due to data loss. The following more backups will take you to understand the specific classification of disaster recovery backup technology.

I. the basis for selecting disaster recovery backup technology

The purpose of disaster recovery backup is to ensure that the business recovers immediately after a disaster, and the application functions can be put into use as soon as possible. The various technologies adopted, whether they are data backup, data replication, or disaster recovery backup technology, are all carried out around the business continuity, and these technologies are the key links of disaster recovery backup. These technical standards are nothing more than RPO (recovery Point objective) and RTO (recovery time objective), that is, how long it takes to keep the business running in the event of a disaster, and how long data will be lost. The specific use of which technology, completely according to the actual needs, and then combined with various technologies can achieve the RTO and RPO indicators to decide.

II. Overview of major disaster recovery backup technologies

1. System disaster recovery (BMR)

System disaster recovery means that when the system crashes, the system can be rebuilt with very few steps, including the above system patches, applications and data. This can improve the accuracy of recovery, shorten the recovery time, and shorten the business interruption time.

At present, there are several ways to restore the main disaster recovery backup technology:

(1) A common optical disc is used, and all systems use this optical disc. This CD can boot the system and the network at the same time, and then the backup server will restore the entire hard disk contents or the first primary partition contents backed up in the tape library (or virtual tape library) to the disaster machine. In this way, no matter how much data the disaster machine originally has, it can be stored in the backup equipment of the entire backup system and managed uniformly, and the CD does not need to be carved frequently, that is to say, the CD does not need to be updated frequently. The typical representative is BakBone NetVault VaultDR.

(2) each computer needs to carve the CD separately, and the recovery needs to use the targeted CD to recover. Each machine needs its own CD, and it needs to be updated regularly. The biggest deficiency of this method is that it is often necessary to carve a CD, otherwise if there is no CD or CD for too long when a disaster occurs, it will affect the speed of recovery and the state after recovery. A typical example of this technology is the EMC NetWork Recovery Manager module.

(3) the recovery needs to be started with the help of the network, that is, it needs a host with the same operating system as the boot machine, and then use the contents of the backup to restore. A typical example of this technology is Symantec NetBackup's Bare Metal Restore module.

(4) disaster recovery backup technology disaster recovery backup technology tools provided by the operating system itself. For most Unix minicomputers, a system backup tool is provided. With the help of the tape drive provided by the system itself, the entire root volume can be backed up to the tape that comes with the server with a simple command. During recovery, the tape can boot the system and restore the entire root volume to the hard disk with a single command. The advantage of this approach is simple and economical, especially for Unix systems, which is far more convenient, secure and economical than the BMR module provided by the current backup software, because the BMR module provided by the backup software often requires other servers on the same platform to start.

two。 Remote data replication

Disaster recovery backup technology produces an available copy of the data in another place in real time. The use of this copy does not need to do data recovery, and the copy can be put into use immediately. The biggest advantage of data replication is that the copy data is available immediately, there is no data recovery time, RTO is very good, and because it is real-time replication, RPO is also very good, almost no data loss. But the cost is higher than the data backup, not only the high price of the data replication system, but also the need for additional hard disk storage space and host system, and even the establishment of another remote computer room, considering network wiring, which will lead to an increase in cost. suitable for large-scale data occasions.

Transferred from Multi-backup Forum

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.