Quick Guide to NAS Lenovo ThinkSystem SR950 Mission-Critical Server Data Recovery

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Lenovo ThinkSystem SR950 Mission-Critical Server
• How to Remove Hard Disks from Your NAS and Connect Them to a PC
  • Step-by-Step Data Recovery with Hetman RAID Recovery
  • How to Safely Recover Data from Disk Images
  • Where Are the User’s Files Actually Stored?
  • RAID Recovery Software: Detailed Comparison

Why Regular Data Recovery Tools Can’t Restore Files from RAID

Conventional hard drives store user data by writing it sequentially across the disk surface, which means an entire file is typically located on a single drive. In contrast, when data is written to a RAID array, each file is split into multiple fragments. These fragments are then distributed and written in sequence across all the drives in the array. Depending on the configuration, fragment sizes can range from 2 KB to 2 MB, so every file is physically stored across several disks at once.

This approach significantly increases read and write performance — after all, writing two halves of a 1 GB file to two drives simultaneously is much faster than writing the full 1 GB to a single disk. However, this same mechanism makes file recovery far more complex.

Different RAID levels use different methods to distribute and protect data. On top of that, manufacturers like Lenovo often add their own proprietary structures and variations. As a result, data can be written to disks in many different formats, and each requires a specific approach during recovery.

Are there any preventive measures to minimize the risk of data loss on NAS Lenovo ThinkSystem SR950 Mission-Critical Server devices?

Yes, there are several preventive measures that can be taken to minimize the risk of data loss on NAS Lenovo ThinkSystem SR950 Mission-Critical Server devices. Here are some of them:

1. Regular backups: Implement a regular backup strategy to ensure that critical data is backed up frequently. This can be done using built-in backup tools or third-party backup software.
2. RAID configuration: Configure the server's RAID (Redundant Array of Independent Disks) for data redundancy. This helps protect against disk failures by distributing data across multiple drives.
3. Uninterruptible Power Supply (UPS): Connect the server to a UPS to protect against power outages or fluctuations. This helps prevent data corruption or loss due to sudden power failures.
4. Use redundant power supplies: Install redundant power supplies in the server to ensure continuous power availability. If one power supply fails, the other can take over without interrupting the server's operation.
5. Implement proper security measures: Use strong passwords and enable access controls to protect against unauthorized access. Regularly update firmware and software to patch any security vulnerabilities.
6. Monitor system health: Implement a system monitoring solution to track the health and performance of the server. This can help identify potential issues before they lead to data loss.
7. Regular maintenance and updates: Perform regular maintenance tasks such as cleaning the server, checking for firmware updates, and replacing aging hardware components. This helps ensure the server's reliability and reduces the risk of data loss.
8. Implement disaster recovery plan: Develop and implement a comprehensive disaster recovery plan that includes procedures for recovering data in case of a major failure or disaster.

It is important to note that these measures can greatly reduce the risk of data loss, but they cannot completely eliminate it. It is always recommended to have a comprehensive data backup and recovery strategy in place.

How to Remove Hard Disks from Your NAS and Connect Them to a PC

Although the NAS ThinkSystem SR950 Mission-Critical Server can be accessed over the network, you still need to remove its hard disks and connect them directly to a Windows PC. Only then can the recovery software properly scan and analyze the drives. Follow these steps:

1. Power off the NAS and disconnect it from the power source.

   WARNING! Before removing any drives, carefully read the device manual. Improper actions may damage both the NAS enclosure and the hard disks in the RAID array.

2. Remove the hard disks one by one, gently sliding each drive out of its slot. Remember that hard disks are highly sensitive: any impact or drop can cause serious physical damage.

3. Label each hard disk according to its position inside the NAS. The order of the drives is crucial for correct RAID reconstruction.

4. Connect the drives to your computer. In this video, we explain which ports you can use to connect hard disks and what to do if your PC does not have enough free connectors.

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   How to Order Remote Data Recovery

Step-by-Step Data Recovery with Hetman RAID Recovery

This program restores data from damaged RAID arrays and is fully compatible with Lenovo ThinkSystem SR950 Mission-Critical Server. Each hard disk in the array contains technical metadata describing how files were written. When launched, Hetman RAID Recovery analyzes this metadata, automatically reconstructs the damaged array, and provides access to its contents. After that, you can browse the recovered disk and save your files. The program can also restore files that were accidentally deleted from the network drive.

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How to recover data from a Lenovo

ThinkSystem SR950 Mission-Critical Server has 24 HDD slots, and it supports the following array types:

• RAID 0;
• RAID 1;
• RAID 5;
• RAID 6;
• RAID 50;
• RAID 60;
• JBOD;

NAS supports:

• exFAT, VFAT, FAT 12 / 16 / 32;
• NTFS / ReFS;
• APFS / HFS+;
• Ext2 / 3 / 4 / ReiserFS / XFS / UFS / ZFS / Btrfs;
• VMFS / HikvisionFS;

How to Safely Recover Data from Disk Images

This utility allows you to create a complete copy of a disk and work with the disk image instead of the physical drive. This approach helps protect your data from:

• Overwriting during the recovery process;
• Additional data loss caused by bad sectors;
• User errors.

To create a disk image, follow these steps:

1. Ensure you have enough free space to store the image. Its size will typically match the size of the original disk.

2. In the main window, select the target disk and choose Tools - Save Disk. You can also select multiple disks if needed.

3. When the Image Creation Wizard opens, select whether you want to save the entire disk or only a specific region. Adjust the settings and click Next.

   

4. Choose the directory where the image will be saved. You may select any available disk connected to your PC or upload the image via FTP.

   

Where Are the User’s Files Actually Stored?

The Lenovo ThinkSystem SR950 Mission-Critical Server network-attached storage keeps LifeLine operating system files on a separate RAID 1 (mirrored) array. Usually, all NAS systems create several volumes on every hard disk, and the first of them takes up to 2 Gb of space. This is where operating system files are stored. Other volumes are united into a RAID array where user’s data is written.

RAID Recovery Software: Detailed Comparison