Data recovery process

When we lose important data, we must want to do data recovery, but we don't know how the data is recovered. What kind of process is this process? Therefore, in order to facilitate beginners to learn, this paper uses raid card reconfiguration, RAID can not be used normally as a case, focusing on the strict data recovery process, so that beginners find the direction of learning progress in practice.

First, preliminary inspection

Storage media: 16 500G hard drives

Fault description: raid card Bios is reconfigured so that the raid information in the 16 hard drives is not recognized and the RAID cannot be used properly.

II. Technical process

1. Prophase backup process

A, power off and shut down the original server.

B, carefully mark all the hard drives on the original server with serial numbers, take the hard drives out of the server, and do not turn on the server until you plug it back in as is.

C, put the original failed hard drive into another read-only professional backup environment, prepare enough target space, and use North Asia disk backup work (or tools such as dd) to make a full sector backup.

D. after the backup is completed, provide a detailed report on the health status of each disk and a list of possible bad channels.

E, return the original faulty disk to the user (it is recommended to put it back in the device as is), and then no longer operate the original disk directly.

2. Restore files

A. through the analysis of the direction of the data in the mirrored disk, the RAID structure (data area start, disk order, block size, check direction, check mode) is obtained.

B. Construct the virtual RAID volume according to the obtained RAID structure.

C. explain the partition structure of the virtual RAID volume and get the file system.

D. interpret the file system and export data.

E, check the data, if there is any error, repeat the Amurd process. If there are errors in the file that cannot be repaired, transfer to other services (such as database repair, see other solutions).

3. Data verification

After all the data is verified correctly, the data recovery is complete.

In analyzing and reorganizing RAID, we should pay attention to the distribution of RAID stripe mirror data based on parity. However, no matter what kind of data recovery you want to do, you should find a professional technology company.

III. North Asia performance Pledge

1. The whole process will not have any write operation to the customer's original disk to ensure the data security of the original disk.

2. Try your best to ensure that the operation of the service is reversible and that the operation can be traced back within the scope of human control.

3. If the data security rescue is not successful, there is no charge.

4. Provide late-stage data storage and service tracking.