Case:
After the holiday, you cannot enter the system. Employees have misunderstandings (pull out the array hard disk 1 piece, try to find data and formatting the hard disk), and the database file needs to be restored.
Solution:
One hard disk is formatted, and two of the other three hard disks have 2 pieces of physical bad tracts. The fault hard disk is mirroring, and then the image disk is analyzed and virtual reorganization. The data recovers 100%.