Most of the customers who adopt diskless have more or less this worry: What should I do if the service is dead For other diskless systems, when the server fails, the following machines cannot be restarted and used, and the entire network
Paralyzed, many customers have experienced such heartache.
Here are some points to share:
Server data recovery backup
The first step of server data recovery is also a necessary step to make a full disk backup of the failed server, because in the process of data recovery, it is inevitable to analyze and reorganize the data.
Repeated analysis and extraction are required many times. If the analysis and reorganization on the original equipment will inevitably destroy the original data of the server, once the data recovery fails due to technical reasons of the data recovery engineer
As a result, the data in the original server is destroyed, and it becomes more difficult for other data recovery companies to perform data recovery operations or even cause the original data to be completely damaged and cannot be recovered. Therefore, the server must be restored to the server first
All disks in the backup are backed up. During the backup, data recovery engineers mostly use data recovery tools to perform full-disk mirroring (especially the hard disks that have failed must be backed up with professional equipment, and mirroring operations cannot be performed by ordinary methods)
Formulate a server data recovery plan
Server data recovery solution
If there is no physical failure of the offline hard disk, forcing the server to go online is the easiest way to repair the server failure. Generally, the offline hard disk will be repaired, and then the server will be forced to go online after reconnecting the server.
If the faulty hard disk is offline because the hard disk is physically faulty, forced online will not only fail but also increase the burden of the raid card. It is impossible to recover data by forcibly going online. In addition, even if there is no physical failure of the hard disk, the method of forced online is adopted
There is also a certain risk in data recovery. We all know that the server will be rebuilt after it is forced to go online. During the rebuilding process, the server may face a complete crash once it detects the failure of other hard drives in the server. Since we are specialized
Industry's data recovery company, so in this data recovery, another more reliable data recovery program was adopted.
Server data recovery solution
Extract the original server data by analyzing the underlying data structure. The principle of this data recovery scheme is to first classify all hard disks according to the original configuration information of the server according to the Mdisk group, analyze the basic raid information of each group of Mdisk, and then use the
Professional data recovery tools virtually reorganize the Mdisk, and then further analysis of the reorganized Mdisk to obtain basic information such as pool information and the distribution of the pool on the Mdisk, the size of the pool strip, and the distribution of the luns in the pool
The server data recovery engineer then writes a small program to extract the lun.
Server data recovery results migration
The server data recovery engineer verifies the extracted lun and migrates the extracted lun to the new server using dd. The server data recovery is successful this time.