Advanced RAID Array Tips for NAS Digiever DFS-16364-RM Data Recovery

Contents

• Why can’t ordinary software tools restore files from RAID?
• How to take hard disks out of the NAS and connect them to a PC?
  • Restoring data with Hetman RAID Recovery
  • Safe recovery from disk images
  • Where are user’s files stored?
  • Comparison of software for RAID recovery

Why can’t ordinary software tools restore files from RAID?

Conventional hard disks keep user’s data by writing it to their surface in a consecutive way, and this is how an entire file is stored on a single hard disk. However, when data is written to a RAID system, a file is divided into several parts. Then these parts are written consecutively to all hard disks within such array. The size of such parts may range from 2 KB to 2 MB, so each file is stored on several hard disks at the same time.

Such approach helps to speed up read and write operations, and it is evident that saving two parts of a file having the size of 1 GB to two hard disks simultaneously is much faster than saving the same 1 GB of data to one hard disk. However, this peculiarity makes file recovery more complicated.

Various RAID levels store information in different ways. Additionally, manufacturers like Digiever also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

How can the NAS Digiever DFS-16364-RM device's CPU or processing power affect data transfer and potential loss?

The CPU or processing power of the NAS Digiever DFS-16364-RM device can affect data transfer and potential loss in the following ways:

1. Data Transfer Speed: The CPU's processing power plays a crucial role in determining the data transfer speed of the device. A powerful CPU can handle data processing tasks more efficiently, resulting in faster data transfer rates. On the other hand, a slower CPU may struggle to keep up with high data transfer demands, leading to slower transfer speeds.
2. Data Loss Prevention: The CPU's processing power also impacts the device's ability to handle data encryption, compression, and error correction during data transfer. A robust CPU can quickly perform these tasks, ensuring data integrity and reducing the chances of data loss or corruption during transfer. In contrast, a weaker CPU may struggle to perform these operations effectively, increasing the risk of potential data loss or corruption.
3. Concurrent Connections: A powerful CPU can handle a larger number of concurrent connections from multiple users or devices. This capability is particularly important in a network-attached storage (NAS) device, as it allows multiple users to access and transfer data simultaneously without affecting performance. Insufficient processing power may lead to bottlenecks and slower data transfer rates when multiple users are accessing the device concurrently.
4. RAID Rebuilding: The NAS Digiever DFS-16364-RM device supports RAID configurations for data redundancy and protection. In the event of a drive failure, the CPU's processing power is crucial for efficiently rebuilding the RAID array by redistributing data across the remaining drives. A faster CPU can expedite the rebuilding process, reducing the vulnerability window and minimizing the risk of data loss.

In summary, the CPU or processing power of the NAS Digiever DFS-16364-RM device plays a significant role in determining data transfer speeds, data integrity during transfer, handling concurrent connections, and RAID rebuilding efficiency. A more powerful CPU can ensure faster and more secure data transfers while reducing the potential for data loss or corruption.

How to take hard disks out of the NAS and connect them to a PC?

Although NAS DFS-16364-RM can be accessed over the network, you still need to take the hard disks out of the storage device and connect them to a Windows computer. Only in this case will the software be able to scan them properly. Here is what you should do:

1. Turn off the storage and disconnect it from the power supply.

   WARNING! Before you start taking hard disks out of your NAS device, read the manual carefully. Incorrect actions may damage your network-attached storage and/or the hard disks within the RAID system.

2. Take the hard disks out of the NAS one by one, carefully removing them from their slots. Remember that the disks are extremely vulnerable: hitting or dropping them may result in serious physical damage.

3. Make sure to mark each hard disk in accordance with how they were installed inside the NAS.

4. Remove the hard disks and connect them to the computer. In this video, we have explored what ports are used to connect hard disks, and what to do if there are not enough ports or connectors.

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   How to Order Remote Data Recovery

Restoring data with Hetman RAID Recovery

This program recovers data from damaged RAID arrays and is fully compatible with Digiever DFS-16364-RM. The hard disks that make up the RAID contain technical information about the algorithm used to save files. When launched, Hetman RAID Recovery reads this information and puts the damaged array together. Then you can open the disk and save your files. Also, you can recover the files accidentally deleted from the network drive.

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How to recover data from a Digiever

DFS-16364-RM has 16 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;

Safe recovery from disk images

This utility lets you save an entire copy of the disk to file and then work with this image instead of the actual disk. Such feature helps to protect data on the disk from:

• Overwriting during the recovery process;
• Loss resulting from bad sectors;
• User mistakes.

To create an image, do the following:

1. Make sure that you have enough free space to save the image. The image file size usually equals the disk size.

2. Select the disk in the main window, and choose from the menu Tools – Save Disk. You can select multiple disks to be saved.

3. When the image creation wizard starts, you can choose to save the entire disk or select only a part of it. Specify the parameters and click Next.

   

4. At this stage, you need to choose a directory where to save the image. Choose any disk connected to this PC, or save the image by FTP.

   

Where are user’s files stored?

The Digiever DFS-16364-RM 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.

Comparison of software for RAID recovery