[server data recovery] data recovery case of server storage shared folder loss

Server data recovery environment ：

DroboPro FS Network memory ;
8 Single disk capacity 2TB Of SAS Hard disk composition raid5 disk array .

 

Server failure ：

A shared folder was lost due to unknown reasons during the operation of the server , Administrator contact our data recovery center , Require the server data recovery engineer to provide on-site service .

Server data recovery process ：

1、 After the server data recovery engineer arrives at the site, the storage of the faulty server is preliminarily checked .

2、 The backup data . Store all the data stored in the failed server for mirror backup , All data recovery operations are performed on the image file .

3、 Through the detection and analysis of the image file , The server data recovery engineer preliminarily determined that the reason for the loss of the shared folder was the underlying system error of the server storage .

4、 Server storage structure test . With the consent of the administrator , The server data recovery engineer tests the storage structure of the failed server storage . The test results show that the storage uses ext4 file system , Fixed management space is 16T, Other structures are used on the upper layer ext4 File system management , The figure shows how to manage the file structure in the server storage ext4 The super block structure of the file system ：

 

5、 Analyze raw data . Analyze the original data stored in the server , First, check the bottom layer ext4 File system integrity . After analysis, it is found that some of the missing shared folders have complete structures , But some node indexes are missing .

6、 Because the storage structure of this server is complex , Use multi-layer index structure to manage the overall space , North Asia data recovery engineers spend a lot of time testing and studying the structural details of the server storage , Finally understand the structure in the storage of the faulty server , Write a program to repair the file system and extract data .

7、 Due to the failure of ext4 Some node indexes in the file system are damaged , Finally, the integrity of the recovered data did not reach 100%, After the administrator's personal inspection , Important data are basically recovered , Only a small part of the data cannot be recovered , Confirmed the results of this data recovery .