Case:
A company is a Dell server, using 6 SAS 500GB hard disk RAID5 disk arrays.The operating system is RHEL 5.5, a server storage company’s application background, which is a large number of web file files and MySQL databases.RAID5 multiple disks have a failure line, causing RAID to collapse. When the administrator tries to restore RAID, there has been a reconstruction of RAID, but the data still cannot be recovered, so the data recovery center was found.
Solution:
The engineer of the data recovery center performs operation 1. First, it is a complete mirror backup of all disks, and it is also the process of comprehensively detecting the disk.2. The test found that there were two disks with serious physical bad sectors. You had to use a dedicated device to use the damaged disk for data mirrors.3. After the mirror is completed, start analyzing the disk data. Use the structure of the EXT3 file system to restore the location of the original disk on the RAID position and the size of the band. Use a special software to perform the virtual RAID combination of 6 disks.The original raid data.4. Analyze the virtual original RAID data, and find that the data of the first two blocks have been severely damaged. It is estimated that the initialization operation of RAID did when the management of RAID was reconstructed.Stop, otherwise it will be completely destroyed.5. The engineer fixed the EXT3 file system in the entire RAID, and finally successfully recovered by 100%data. The customer was very satisfied.