Server data recovery user: A university in Jiangxi Province
Server data recovery failure description:
The user is using Sugon Model 16-bay optical fiber storage cabinet, the underlying storage medium is 16 600GB optical disks, which are made into two groups of RAID5 disk arrays, each group of raid has 7 disks, and the other two disks are made into global hot spare disks.
The first group of RAID disk array has 3 LUNs, which are allocated to a linux host, a sun minicomputer and an esxi host. The second group of RAID is all given to an ESXI5.0 host, which stores the data of about 10 virtual machines. 
The process of server disk array failure:
Storage disk alarm, server storage original technicians perform the operation of replacing disks on the raid disk array and optimize the storage. When optimizing storage After deleting all the VGs and importing the backup information, after the second group of RAID is recognized by the ESXi host, it prompts that it needs to be initialized.
Raid disk array data recovery program analysis and data recovery process:
- The failed raid array was synchronized after the disk was replaced. This When the VG information is deleted, the data synchronization is terminated. After the operation and maintenance personnel import the backup VG information, the RAID is a new RAID array. Generally speaking, once the data is synchronized, the new raid array will be synchronized to a blank disk, and the data cannot be recovered. Fortunately, the manufacturer’s technicians turned off the data synchronization function for safety. It is this operation that saved the data, otherwise the server data will suffer irreversible damage.
- The customer brings all the disks to our company, and then the engineer separately mirrors all the disks to the secure storage, and then no longer operates the original disks to ensure the originality of the user’s disks.
- Analyze the underlying structure, reconstruct the original RAID, reorganize the RAID virtually, and mirror it to the temporary storage again. Use the VMWare ESX data recovery software: Frombyte Recovery For ESX. All the data can be seen normally and will be restored. The good storage is attached to the ESXi server, and it is verified that all virtual machines can be started normally and there is no problem with the data.