Unable to enter the operating system after the server is powered off

Case:
The client server starts after the power is disconnected. The hard disk cannot be found. The customer can find the hard disk after re -inserting the RAID card and hard disk. The raid information is not wrong.

Solution:
After testing and analysis by the engineer, RAID information was damaged, and one of the three plates in RAID had different data caused by different errors. Analysis of the original RAID information, the data restructuring was successfully recovered