Shulou(Shulou.com)06/02 Report--

Server data recovery process:

A server in a court crashed due to a hard disk failure, and a data recovery operation was carried out at a local data recovery institution, but the data recovery was not successful, so the person in charge looked for a data recovery company in Beijing to carry out data recovery. The basic configuration of this server is shown in the following figure.

The person in charge of the server brought all the hard drives in the server to the Beijing data recovery Center. the hardware engineer first physically tested all the hard drives, and no physical failure of the hard disk was found, that is to say, the cause of the server crash was not the hard disk failure. The server data recovery engineer mirrored the hard disk and analyzed the image files to try to find out the cause of the server failure.

After analysis, it is found that at least two hard drives in the server are offline, which leads to the server crash. the data recovery engineer uses the exhaustive method to remove the earliest offline hard disk and reorganize the disk array, and mount the generated data and another set of intact raid in the server to the original server at the same time for verification. After customer verification, all the data in the server is successfully restored.

Common methods for server data recovery:

In the process of using the server, it is inevitable that all kinds of failures will lead to data loss, so it is necessary to restore the data to the server at this time, so what are the failures that the server is usually prone to:

First of all, the physical failure of multiple hard drives in the same array will lead to data loss; server module aging, server system updates, accidental power outages and other situations may lead to server crash and data loss; wrong unplugging of the hard disk in the server, erroneous deletion and other human factors are also another major factor leading to server data loss.

Once the failure of the server leads to the loss of data, first of all, all the normal non-hot spares in the failed server should be mirrored and backed up, and the hard disk with physical failure should be protected from bumps, water, etc. If conditions and conditions can be simply dealt with and the data in the failed hard disk can also be mirrored and backed up with the help of professional data recovery tools. After getting the mirror data, we need to analyze the data and find out the structural parameters in the original array in order to reconstruct the server array and logical verification. After verification, the server data can be successfully exported.

If the server crashes or fails to start due to unknown reasons, non-staff should not disassemble the hard disk in the server, replace the head and other data recovery operations in the non-clean space. It is also recommended that the server administrator take good care of the failed hard disk and wait for a professional data recovery engineer to deal with it.

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