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

[introduction to server data recovery failure]

The data recovery center recently received a customer server data recovery case and successfully recovered. With the permission of the customer, the data recovery process is now shared with you. Here is a brief introduction to the failure of this server data recovery.

Customers use a certain brand of server, with multiple hard drives to form a set of raid5 disk array, which is used as the company's shared storage pool, and the server contains company database files and ordinary files. Due to the failure of the hard disk to identify the D partition in the server, the server administrator restarts the server after checking the device, causing the server to go online again and synchronize the data. When the synchronization progress reaches 36%, the server is forced to shut down by the administrator.

[server data recovery detection]

The data recovery center arranges engineers to go to the customer site for server failure detection and data recovery operations. First of all, the hardware data recovery engineer carries on the physical inspection to the client server hard disk to eliminate the impact of physical failure on the hard disk. After testing, the hard disk is normal and there is no physical fault. Therefore, it can be concluded that the reason why the hard disk is offline is caused by unstable reading and writing. Then the server data recovery engineer makes a mountain-level mirror backup of all the hard drives in the customer server, and the backup file will be the operation data for the data recovery engineer to reorganize the server and restore the data.

[server data recovery process]

The server data recovery engineer analyzes the mirror data and obtains the raid array stripe size, disk order and other key information in the original server. Then get the configuration information of the original server array from the customer, classify all the hard drives in the server according to the mdisk group, analyze the mdisk group to get the array group information of all the hard drives, and then reorganize the raid array to extract the array data.

After the above server data recovery operation, the data in the customer's original server was successfully extracted and verified. The server data recovery engineer checked and found that the data was incomplete and some database files were destroyed. The server data recovery engineer re-adjusts the data recovery tool parameters, scans the data fragments in the client server and extracts them. The database data recovery engineer joined the data recovery team to analyze and reassemble the extracted dat fragments to verify the integrity of dat data and the underlying structure showed damage. Continue to scan the free space of the partition, piece together the free space data fragments, regenerate the database file and verify the availability. It is verified that the database can be loaded normally and the upper application can be used normally.

[server data recovered successfully]

The engineer of the data recovery center verified the reorganized data and found no abnormality, and contacted the client server administrator to verify the data recovery result. after verification, all the data in the customer's original server were recovered successfully. the server data is restored successfully.

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