········ VSAN is a used in servers, storage in vSphere kernel as the basis for the development of scalable distributed storage architecture. By installing a flash memory and a hard disk VSAN server cluster master vSphere constructed which VSAN memory layer. These devices are controlled and managed by the VSAN, VSAN form a unified shared memory layer for use vSphere cluster. Like other server architectures, vsan will cause the server to fail loss of data, today to introduce one case of abnormal power failure due to server vsan abnormal logic architecture, virtual disk files lost data recovery success stories.
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First, server data recovery fault description
········ server data recovery in this case is described in a VMware vsan over converged infrastructure, including four server nodes, equipped with a total of eight SSDs and mechanical hard disk on the server 8, in which a solid hard drive as a cache disk. Due to unstable power supply causes the server to the client computer room abnormal shutdown, restart the server administrator to find fault vsan logic architecture, part of a virtual disk component exception, disk files are missing. Loss of important data, emergency contact data recovery center for server data recovery operations. 
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Second, the server data recovery detection process
First of all clients on the server after receiving the customer's telephone consultation ········ server data recovery center within 30 minutes of schedule engineer from Beijing headquarters of home visits for fault detection server data recovery, server data recovery engineers arrived at the customer site the original hard drive image backup. Backup data recovery center is to be numbered on all hard vsan server node server and removed, using the data recovery device is connected to a read-only data recovery on a dedicated server, the underlying data will be byte-wise mirroring of all hard disk in the client server. After the completion of data recovery engineers mirror mirrored server files are scanned to resolve the customer's virtual machine discovery information is lost without the formation of a very serious, important information intact data recovery, server data recovery success rate is expected to more than 90%.
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Third, server data recovery process
········ server data recovery engineers use to write their own data recovery program scans all components of customer data mirroring information scanning, information components and the component ID for each component of the information recorded in the attached object ID, etc. . The assembly is then traced back to each block runlist logical location within the assembly is affiliated, and then by means of self-developed server data recovery tool assembly and recombinant full extraction.
After the server data recovery engineer ········ All extracted components in accordance with a logical combination of the position information of each component in the description information recorded in the server, so that a complete splicing vmdk file.
Parse again ········ server data recovery engineer will scan all the data to the overall analysis, the internal server disk snapshots and Father of all there is a snapshot vmdk file merge, extract the data backup file.
First, data recovery installed on the client server database environment after ········ due within the customer's server stores the file type is a database file, the server data recovery engineers to extract all the data out of the database files will be restored to restore data to verify the correctness of the recovery server. By the server data recovery engineers to recover data to verify the database found no error, database integrity.
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Fourth, server data recovery results show
········ server data recovery after the completion of the data recovery results are verified by the customer administrator, all validated all data recovery, this data recovery success rate of 100%. Finally, the data recovery engineers with customers to migrate all the data back to the client server data recovery this end.
········ These are the course of this server data recovery, if you have better data on vsan recovery program please call our 24-hour customer service telephone technical learn, or give me a message for more data data recovery knowledge and safety knowledge.