Shulou(Shulou.com)06/02 Report--

1. Description of server data recovery

The server that needs data recovery is Huawei OceanStor S6800T. The hardware configuration of the server is 15 disks to form a set of 80T raid5 array, which is divided into two lun and three partitions. After the server reinstalled the system, it was found that one of the disk partitions was missing and server data recovery was needed.

Second, server data backup

The first step of server data recovery requires mirrored backup of all the disks of the failed server, the customer takes all the disks of the server to the North Asia data recovery center, and the engineer mirrors the data of all disks to the backup server with the help of the data recovery tool. For later analysis and recovery of data.

Third, formulate a server data recovery plan

1. First of all, you need to search and view the FILE ID number with the help of the data recovery tool, and analyze the raid5 array's disk order, block size, stripe size, loop direction, asynchronous and other information through the numbering rule (Note: non-professionals are not recommended to operate on their own, and it is best to find a professional data recovery company to operate if the data is very important).

2. Through the analysis of the raid information, the raid structure is virtually reorganized.

3. Locate the starting location of the partition of the xfs file system; XFS INODE number: the number of digits with variable length, which is composed of three parts: starting block group number + starting block number + intra-block INODE number. The bit lengths of the starting block number and the INODE number within the block are specified by the parameters in SUPERBLOCK.

4. Check the integrity and correctness of the file system; through verification, it is found that the super block and some nodes and directory items in the head of the file system are missing.

5. Repair the super block structure of the xfs file system, repair and restore the super block according to the super block backup and the directory tree structure in the file system.

6. Repair the lost nodes and directory items in the xfs file system, repair and reconstruct the lost nodes and directory items.

7. After the repair is completed, write a program to parse the file system and extract the server data.

4. Screenshot of server data recovery process

Fifth, server data recovery results

Because the customer did not do any other destructive operations such as writing to the server after the data loss, most of the data and file system information remained intact, and the data was recovered 100% successfully.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.