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VSAN is a scalable distributed storage architecture based on vSphere kernel, which is used in server and storage. VSAN builds the VSAN storage layer by installing flash memory and hard drives in the server vSphere cluster host. These devices are controlled and managed by VSAN, and VSAN forms a unified shared storage layer for vSphere clusters. Like other server architectures, vsan failures can lead to server data loss. Today, we will introduce a successful data recovery case of abnormal vsan logical architecture and loss of virtual disk files due to abnormal server power outage.

Description of server data recovery failure

The server data recovery case introduced in this paper is a set of VMware vsan super-converged infrastructure, including 4 server nodes, and a total of 8 solid state drives and 8 mechanical hard drives are configured on the server, of which solid state drives are used as cache disks. Due to the unstable power supply in the client computer room, the server was shut down abnormally. After restarting the server, the administrator found that the vsan logical architecture failed, some virtual disk components were abnormal and the disk files were lost. It is very important to lose data, so urgently contact the data recovery center for server data recovery operation.

Second, the server data recovery detection process

Within 30 minutes after receiving the inquiry call from the customer, the server data recovery center arranges an engineer from the headquarters in Beijing to come to the door to detect the failure of server data recovery. after arriving at the customer site, the server data recovery engineer first mirrors all the original hard drives on the client server. The backup mode of the data recovery center is to number all the hard drives on the vsan node server and take out the server, use the data recovery read-only device to connect to the special data recovery server, and mirror the underlying data of all the hard drives in the client server byte by byte. After the completion of the image, the data recovery engineer scanned and parsed the mirrored server files and found that the loss of the virtual machine construction information of the customer was not very serious, and the important data recovery information was preserved completely. the success rate of server data recovery is expected to be more than 90%.

III. Server data recovery process

The server data recovery engineer scans all the component information of the customer mirror data using the data recovery scanning program written by himself, and gets the component ID recorded in each component information and the object ID to which the component belongs. Then trace back to the logical position of each data block in the component according to the runlist in the component, and then reorganize and extract the complete component with the help of the self-developed server data recovery tool.

The server data recovery engineer extracts all the component information and combines them according to the logical location of each component recorded in the description information in the server to piece together a complete vmdk file.

The server data recovery engineer will analyze all the scanned data as a whole, merge the snapshots of all the vmdk files with snapshots and the parent disk in the server, and parse again to extract the data backup files.

Because the type of files stored in the customer's server is database files, after extracting all the data, the server data recovery engineer first installs the customer's database environment on the data recovery server to restore the recovered database files to the data recovery server for correctness verification. After the server data recovery engineer verified the recovered data, it was found that the database did not report an error, and the database was complete.

IV. Verification of server data recovery results

After the server data recovery is completed, the data recovery results are verified by the customer administrator, and it is verified that all data are restored, and the success rate of data recovery is 100%. Finally, the data recovery engineer will cooperate with the customer to migrate all the data back to the customer server, and this data recovery is over.

The above is the process of server data recovery, if you have a better data recovery plan about vsan, please call our 24-hour customer service phone for technical discussion, or leave me a message to learn more about data recovery and data security.

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