EMC Storage XFS File System RAID5 Data Recovery Darth Technology

Media Information: RAID 5 configuration with four hard drives, model ST2000DM001.

Fault Type: RAID failure, resulting in the inability to read or write data.

Troubleshooting Process:

The engineer began by testing each individual hard drive to identify potential issues. It was discovered that the storage system used an EMC XFS file system, which is known for using a 520-byte sector size—8 bytes of which are reserved for parity information. This differs from the standard 512-byte sector size found in most common storage systems. After thorough analysis, it was determined that the root cause of the problem was the loss of RAID metadata, leading to the array being unmountable and inaccessible.

Data Recovery Process:

To begin the recovery process, each hard drive was imaged to create a bit-by-bit copy of its contents. Using specialized data recovery software called Darth, the team converted the 520-byte sector images into 512-byte sector format to match the expected structure of the RAID array. The next step involved analyzing the block size and determining the correct disk order. Once the layout was understood, the RAID array was successfully reconstructed, and the data was recovered without any loss.

Data Recovery Results:

The data recovery was 100% successful, with all files and data restored accurately and intact.

Recommendations for Customers:

When a RAID array fails, it's crucial not to make any changes or attempt to fix it yourself, as this can lead to further damage and reduce the chances of successful recovery. If the data has been accidentally deleted or corrupted, it's best to consult a professional data recovery service immediately. Taking unnecessary actions may result in permanent data loss and additional costs for the company.

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