How to Recover Lost Data from a Faulty RAID Array in NAS Idis DR-2404P

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 Idis also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

Are there any preventive measures to minimize the risk of data loss on NAS Idis DR-2404P devices?

Yes, there are several preventive measures that can be taken to minimize the risk of data loss on NAS Idis DR-2404P devices. Here are some recommendations:

1. Regularly backup data: Implement a regular backup schedule to ensure that important data is backed up regularly. This can be done either manually or through automated backup solutions.
2. RAID configuration: Configure the NAS device in a RAID (Redundant Array of Independent Disks) configuration to provide data redundancy. RAID levels like RAID 1 or RAID 5 can help protect against data loss in case of disk failures.
3. Uninterruptible Power Supply (UPS): Connect the NAS device to a UPS to protect it from power outages and surges. Sudden power loss can cause data corruption or loss, so having a UPS can prevent such incidents.
4. Security measures: Implement strong security measures like using complex passwords, enabling two-factor authentication, and regularly updating the firmware of the NAS device. This can help protect against unauthorized access and potential data breaches.
5. Regular maintenance and updates: Keep the NAS device firmware, operating system, and applications up to date. Manufacturers often release updates to fix vulnerabilities and improve system stability, so regularly applying these updates is essential.
6. Physical security: Ensure that the NAS device is stored in a secure location to prevent physical theft or damage. Limit access to authorized personnel only and consider using security cameras or alarms to enhance physical security.
7. Monitoring and alerts: Set up monitoring and alert systems to notify you of any potential issues like disk failures, high temperatures, or network connectivity problems. This allows you to take immediate action and minimize the risk of data loss.
8. Regular testing and verification: Periodically test the backup and restore processes to ensure that the backups are working correctly and can be restored successfully. This helps identify any issues beforehand and ensures the integrity of the backup data.

By following these preventive measures, you can significantly minimize the risk of data loss on NAS Idis DR-2404P devices and ensure the safety and availability of your data.

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

Although NAS DR-2404P 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 Idis DR-2404P. 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 Idis

DR-2404P 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;

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 Idis DR-2404P 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