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This article Xiaobian for you to introduce in detail "RAID information lost data how to recover", the content is detailed, the steps are clear, the details are handled properly, I hope this "RAID information lost data how to recover" article can help you solve your doubts, the following follow the editor's ideas slowly in depth, together to learn new knowledge.

[description of data recovery failure]

Server basic information of this data recovery: a certain brand DL380 series server, the storage is a RAID5 disk array composed of 6 73GB SAS hard drives, the upper operating system of the server is WINDOWS 2003 SERVER, the server mainly stores the enterprise's internal files, there are no database files, and there have been several unexpected power outages before the failure of the host of the server (without UPS), because there is no exception after reboot. Therefore, the server has been in use until there was a power outage and restart after RAID reported an error, indicating that the storage device could not be found, and the operation crashed after entering the RAID management module. The administrator still had no way to enter the system after many attempts to restart the server. In order to prevent data loss in the server, the administrator contacted the data recovery center for server data recovery.

[data recovery failure analysis]

Usually, the data loss of the server in this situation is mostly due to the damage of the RAID module caused by the unexpected power outage of the server (including the loss of RAID management information and the hardware damage of the RAID module). Generally speaking, the information of the management module of the RAID array is fixed and will not change after the creation of the raid array, but the module information of the raid array still belongs to the modifiable part. The accidental power outage of the server can easily cause this information to be tampered with or even lost, and multiple power outages may even lead to damage to the components on the raid card, thus making the host lose the middle layer module for RAID management of multiple physical hard disks. In this case, the operation crash of the RAID module is most likely caused by the raid card hardware damage (later verified by the HP after-sales technical staff). At this time, it is impossible to obtain the data in the 6 hard drives through the normal way, and can only rely on the third party to provide data recovery services to solve.

[server data recovery process]

The first step of server data recovery is to carry out strict physical inspection of all the hard drives in the customer's server in order to check whether the hard drives have hardware faults. After inspection, it is found that all the hard drives in the server can be read normally.

As all the hard drives are normal, there is no need for hardware repair, just mirror the hard disk in the server.

After the mirroring is completed, the server data recovery engineer begins to analyze the structure of this group of raid, mainly in order to determine the hard disk order of the raid array, the size of the data block and the array verification mode for rebuilding the raid array.

The server data recovery engineer uses the analyzed raid array information to virtually reconstruct a set of raid arrays and perform logical verification to ensure that the parameters applied in the reconstructed RAID are correct, and then fully verify the data that users are most concerned about.

Finally, the data recovery engineer contacted the customer to verify the recovered data. After verification, all the data has been successfully restored, and the data recovery has been successfully completed after the successful data migration.

[server storage security recommendations]

Try to ensure a stable power supply in the computer room, so as to reduce the impact of abnormal power supply on the host and storage

It is best to configure UPS for important servers and storage, which can ensure that the core business system can continue to work normally for a certain period of time in case of accidental power outage in the computer room, thus winning valuable time for enterprises to seek emergency solutions.

The security status of the server that has been in service for a long time should be checked regularly, and its overall operation status should be evaluated to determine whether to upgrade the hardware and system comprehensively, and to formulate an emergency plan to deal with sudden data disasters in advance to reduce business losses caused by data disasters.

After reading this, the article "how to recover the lost data of RAID" has been introduced. If you want to master the knowledge points of this article, you still need to practice and use it yourself to understand it. If you want to know more about related articles, welcome to follow the industry information channel.

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