Environmental Science ：
16 It's made up of two hard disks raid6 disk array .
fault ：
A hard disk in the disk array is disconnected due to physical failure , The virtual machine cannot be used normally , Some partitions are missing . After the administrator restarts the server, it is found that the upper data is still missing , Contact North Asia Data Recovery Center for data recovery .
Data recovery process ：
1、 By detecting the upper data of the server , The data recovery engineer of North Asia judged that the failure was caused by the drop of the hard disk, and the file system of the upper virtual machine was damaged . Generally, in this case, the method of splicing file fragments can be considered to recover the lost data .
2、 Splice existing file fragments . The splicing principle is ： adopt fbb In the bitmap information of the source file 512M The bitmap information is spliced . Usually , Different types of metafile pointers damaged by the upper virtual machine of the server will lead to different data index positions finally pointed to . Now the meta file of the virtual machine has been damaged , The existing data through the server cannot confirm the pointer type . If the final position of the pointer is not fbb Metafile area , Data cannot be recovered by splicing file fragments .
3、 Since the method of splicing file fragments doesn't work , Only through the method of reverse verification , Suppose that the damaged metafile pointer of the upper virtual machine does point to fbb Medium 512M Bitmap , According to this idea, the data recovery engineer of North Asia decided to scan and splice the underlying data of the server directly , Data inspection shall be carried out continuously during the splicing process .
4、 Data recovery engineers in North Asia found two directories during data splicing , After verification, it is found that the two directories are very similar , The North Asia data recovery engineer judges that the data in one of the directories is backup data . So the North Asian engineers compared this in detail 2 A directory in a similar directory 、 Files and underlying data , It is found that the data in the two directories are completely consistent , Confirm that one of them is backup data , Therefore, you only need to restore the data of either of these two directories .
5、 North Asia data recovery engineers continued to splice one of the directories and found that the file system was seriously damaged , All files cannot be opened and used normally . You can only splice and restore another directory . The North Asia data recovery engineer spliced and recovered the data in directory 2 . After the reply is completed, it is verified , Most files can be used normally .
6、 North Asia data recovery engineers continue to extract incomplete data 、 Splicing 、 Manual repair , Finally, all data in the server is successfully recovered , After the administrator personally verifies the data , Confirm that the upper virtual machine of the server can be used normally , Data integrity , This data recovery is successful .
