Understanding RAID Controller Failure on NAS QNAP Turbo Station TS-439U-RP / SP: Causes and Consequences

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 QNAP 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 specific precautions to take while migrating data between NAS QNAP Turbo Station TS-439U-RP / SP devices?

Yes, there are specific precautions to take while migrating data between NAS QNAP Turbo Station TS-439U-RP/SP devices. Here are some important steps to follow:

1. Backup your data: Before starting the migration process, it is crucial to create a backup of all your important data. This ensures that even if something goes wrong during the migration, your data will remain safe.
2. Check compatibility: Make sure that the target NAS device (TS-439U-RP/SP) is compatible with the source NAS device. Check the QNAP website or user manual for compatibility information.
3. Update firmware: Ensure that both the source and target NAS devices are running the latest firmware version. Updating the firmware reduces the risk of compatibility issues and ensures a smoother migration process.
4. Verify network connectivity: Ensure that both NAS devices are connected to the same network and can communicate with each other. Check the network settings and configurations to avoid any connectivity issues.
5. Plan the migration: Decide on the migration method you want to use. QNAP provides various migration options such as QNAP External RAID Manager, QNAP NetBak Replicator, or QNAP Snapshot Replica. Choose the method that suits your requirements and follow the provided instructions.
6. Follow the migration process: Depending on the chosen migration method, follow the step-by-step instructions provided by QNAP. Pay attention to any warnings or precautions mentioned in the documentation.
7. Monitor the migration process: During the migration, keep an eye on the progress and make sure there are no errors or issues. If you encounter any problems, refer to the QNAP support resources or contact their technical support for assistance.
8. Test the migrated data: Once the migration is complete, verify that all your data has been successfully migrated to the new NAS device. Access your files, folders, and applications to ensure everything is working as expected.

By following these precautions, you can minimize the risk of data loss or migration issues while transferring data between NAS QNAP Turbo Station TS-439U-RP/SP devices.

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

Although NAS Turbo Station TS-439U-RP / SP 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.

   Go to view

   

   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 QNAP Turbo Station TS-439U-RP / SP. 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.

Go to view

How to recover data from a QNAP

Turbo Station TS-439U-RP / SP has 4 HDD slots, and it supports the following array types:

• RAID 5;
• RAID 6;
• RAID 10;
• RAID 0;
• RAID 1;
• JBOD;

NAS supports:

• ZFS;
• EXT4;
• EXT3;
• FAT32 (External Disk Only);
• NTFS (External Disk Only);
• HFS+ (External Disk Read Only);

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 QNAP Turbo Station TS-439U-RP / SP network-attached storage keeps QTS (QuTS hero) 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