Media Information: HP MSA1000, RAID ADG configured with seven hard drives, operating system: Windows Server 2003.
Fault Description:
The system started displaying an $MFT error. The user was advised to run the CHKDSK command to fix it, but the administrator ignored the warning. One day, the second disk in the array suddenly turned red, indicating a failure. The administrator unplugged the second drive and replaced it with a new one. After completing all the steps, the disk partition still could not be accessed, and the data remained inaccessible.
Data Recovery Process:
Upon analyzing the underlying data, the RAID data recovery engineer discovered that the first 15 GB of each disk contained redundant information that matched the RAID ADG configuration rules. Each disk had about 15 GB of data that aligned with the RAID ADG structure. This suggested that the data reconstruction method followed the RAID ADG rules. However, the actual layout didn't match expectations, which might have been due to several possible reasons. For example, after replacing the second drive, the system may have mistakenly used the new drive as the seventh disk, or the seventh disk may have failed earlier, leading the system to rebuild using the second drive as the replacement. Additionally, physical swapping of the second and seventh disks, or other similar actions, might have contributed to the confusion. Based on the 15 GB per disk data pattern, the engineer reconstructed the RAID array using an "escort ship" approach. The result showed that the directory structure was disordered, but most files were successfully recovered and appeared to be normal.
Data Recovery Results:
Most of the data was successfully recovered, with only minor issues in the directory structure. The majority of files were intact and accessible.
Advice to Customers:
If a RAID server fails, the first step should be to stop the server immediately. It is crucial to label the hard drive sequence accurately and avoid making any further changes. Then, contact a professional RAID data recovery company to perform the recovery before attempting to repair the server itself. This approach helps prevent further data loss and increases the chances of successful recovery.
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