How to recover data from QNAP TVS-951X NAS

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 system logs or event notifications to monitor for early detection of data loss on NAS QNAP TVS-951X devices?

Yes, there are specific system logs and event notifications that you can monitor for early detection of data loss on QNAP TVS-951X NAS devices. Here are a few key logs and notifications to keep an eye on:

1. System Logs: QNAP NAS devices maintain system logs that record various events and activities. Monitor the system logs for any error messages related to storage, file system, or disk issues. Look for warnings or errors that indicate potential data loss or corruption.
2. SMART Logs: SMART (Self-Monitoring, Analysis, and Reporting Technology) logs provide detailed information about the health and status of hard drives. QNAP NAS devices support SMART monitoring, and you can check the SMART logs regularly for any signs of impending hard drive failure or data loss.
3. RAID Health Notifications: If you have configured your QNAP NAS with RAID (Redundant Array of Independent Disks), monitor the RAID health notifications. QNAP NAS devices typically send email alerts or push notifications when there are issues with the RAID array, such as disk failures or degraded performance.
4. Storage Pool Notifications: QNAP NAS devices use storage pools to manage storage resources. Monitor the storage pool notifications for any warnings or errors related to storage pool integrity, capacity, or performance. These notifications can help you identify potential data loss situations.
5. Backup Job Notifications: If you have configured backup jobs on your QNAP NAS, monitor the backup job notifications. These notifications will inform you if any backup jobs have failed or encountered errors while backing up your data. Failed backups can indicate potential data loss if not addressed promptly.

It's essential to regularly review these logs and notifications to proactively detect any potential data loss situations on your QNAP TVS-951X NAS device. Additionally, consider implementing a comprehensive backup strategy to safeguard your data in case of any unforeseen data loss events.

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

Although NAS TVS-951X 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 TVS-951X. 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

TVS-951X has 9 HDD slots, and it supports the following array types:

• RAID 50;
• RAID 60;
• RAID 6;
• RAID 5;
• RAID 10;
• RAID 0;
• RAID 1;
• JBOD;

NAS supports:

• ZFS;
• EXT4;
• EXT3;
• exFAT;
• 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 TVS-951X 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