How to Recover a Faulty RAID Array from NAS Digiever MN-2109 Pro+

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Digiever MN-2109 Pro+
• 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 Digiever 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.

How can quality of service (QoS) settings impact data transfer reliability on NAS Digiever MN-2109 Pro+ devices?

Quality of Service (QoS) settings can have a significant impact on data transfer reliability on NAS Digiever MN-2109 Pro+ devices. Here are a few ways QoS settings can affect data transfer reliability:

1. Bandwidth allocation: QoS allows you to allocate specific bandwidth limits to different applications or services. By prioritizing certain applications over others, you can ensure that critical data transfers receive the necessary bandwidth, reducing the chances of congestion or network saturation that could lead to data transfer failures.
2. Traffic prioritization: QoS enables you to prioritize certain types of network traffic, such as video streaming or VoIP, over other less time-sensitive traffic. By giving priority to critical data transfers, you can minimize delays and ensure their reliable delivery.
3. Packet prioritization: QoS settings can prioritize specific packets within a data stream, ensuring that important packets are delivered first. This can be particularly useful in scenarios where data transfers are sensitive to latency or where real-time applications require uninterrupted data delivery.
4. Traffic shaping: QoS allows you to shape or limit the rate of data transfer for specific applications or services. By controlling the flow of data, you can prevent network congestion and ensure a more reliable transfer of data.
5. Error correction and retransmission: Some QoS mechanisms, such as Forward Error Correction (FEC) or Automatic Repeat Request (ARQ), can enhance data transfer reliability by detecting and correcting errors or retransmitting lost or corrupted data packets.

By configuring QoS settings appropriately on NAS Digiever MN-2109 Pro+ devices, you can optimize network resources, prioritize critical data transfers, and minimize the chances of data transfer failures or disruptions, ultimately improving overall reliability.

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

Although the NAS MN-2109 Pro+ 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 Digiever MN-2109 Pro+. 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 Digiever

MN-2109 Pro+ has 2 HDD slots, and it supports the following array types:

• RAID 0;
• RAID 1;
• 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 Digiever MN-2109 Pro+ network-attached storage keeps OS Linux 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