Introduce more server class data recovery cases, today small angle to restore virtual machine data from the introduction of a power failure due to abnormal data caused by the virtual machine can not start the recovery success stories for everyone. Which involves not only the virtual machine data recovery, while also relates to server data recovery, technical knowledge database repair.
Customers a virtual machine because the server can not start abnormal power failure, the client virtual machine based on a well-known brand EVA8400 server hardware, using ESXI5.5 operating system, virtual machine data in a database. 
Guest virtual machine can not start after a server restart operations, but the virtual machine still can not start, because the customer data confidential, but to contact a professional data recovery operations.
Data recovery engineers to the customer site for data recovery testing found, the user's virtual machine has two snapshots, the two virtual machine snapshots to disk format and then merge the virtual machine image file to open the analysis. The analysis found that the internal file system data has been cleared, is replaced by other forms of file data loss, the index file database to be replaced.
Data recovery process:
The main guest virtual machine data in the database file, so long as the extracted database file within the virtual machine to complete the virtual machine data recovery. Due to the use of the database is independent of engine mysisam space to store the table data, i.e. data table are independent of each store. Therefore it is destroyed but the presence of the file can still recover the database file by way of analysis of the underlying data in the index file. Database engineers through the analysis of customer image file and repair, eventually extracted a database file data, validate the data after the data recovery engineers rebuild a virtual machine, the data still partially destroyed, prediction may be due to system table space abnormal sake this part of the data has been determined beyond repair.
After contacting the customer to conduct on-site verification data represents data in the virtual machine about 3% of the data is not restored successfully, but the important data in the database has been successfully restored. It failed to restore 3% of the secondary data, customer acceptance of this data recovery result, virtual machine data recovery success.