Case:
Data restores a set of RAID5 composed of 8 hard disks of Siemens. The server was inexplicable a few days ago. After viewing by the technicians, all the hard disks on the array are online.But when it starts, it is prompted to find the array.Unable to start.Customers contact data recovery through the data center.Data recovery immediately detects and takes the machine to the data recovery center recovery.
Solution:
Data recovery engineer testing, RAID5 can theoretically reduce a hard disk, and RAID fails to get off at least two hard disks.However, one of the hard disks may be dropped at a certain time before one of them, one month, or even a year ago, it is possible.It’s just that RAID can be used normally, so most technicians have not found it.Display the hard disk online when viewing the tool, but repeatedly restart after falling or re -insert the hard disk and re -launched.But it does not mean that RAID is intact.Because the hard disk data is not synchronized after the launch, RAID is still invalid. At this time, do not do synchronous operations.Otherwise, the data may not be opened after the data is inconsistent after synchronization, and all damage is damaged.This group of RAID hard disks has a bad sector, causing the unable to read normally to drop, and the other hard disk is dropped normally this time.The engineer damaged the hard disk data through a certain algorithm, reappeared the correct RAID, and launched the entire set of RAIDs, and the data recovered successfully.