How to recover data from Lenovo ThinkSystem SR250 V2 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 Lenovo also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

Can insufficient power supply or voltage fluctuations cause data loss on NAS Lenovo ThinkSystem SR250 V2 devices?

Insufficient power supply or voltage fluctuations can potentially cause data loss on any electronic device, including NAS (Network Attached Storage) devices like the Lenovo ThinkSystem SR250 V2.

Power supply issues can lead to unexpected shutdowns or unstable operation, which may result in data corruption or loss. Voltage fluctuations can cause similar problems, as they can disrupt the proper functioning of the device's components and storage media.

To mitigate the risk of data loss due to power supply issues or voltage fluctuations, it is recommended to:

1. Use a reliable and stable power source: Ensure that the NAS device is connected to a stable power outlet or use a UPS (Uninterruptible Power Supply) to provide backup power during power outages or voltage fluctuations.
2. Properly configure power management settings: Configure the NAS device's power management settings to prevent sudden shutdowns or power-related issues. This may include adjusting sleep or idle settings, setting up automatic power-on after power loss, or enabling power failure recovery options.
3. Implement data redundancy: Utilize RAID (Redundant Array of Independent Disks) or other data redundancy configurations to protect against data loss. This involves distributing data across multiple drives to ensure that if one drive fails, the data can be recovered from the remaining drives.
4. Regularly backup data: Implement a backup strategy to regularly backup important data stored on the NAS device. This can be done by utilizing external storage devices, cloud backup services, or network backups to ensure data redundancy and protection.

By following these precautions, you can minimize the risk of data loss on your Lenovo ThinkSystem SR250 V2 NAS device caused by insufficient power supply or voltage fluctuations.

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

Although NAS ThinkSystem SR250 V2 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 Lenovo ThinkSystem SR250 V2. 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 Lenovo

ThinkSystem SR250 V2 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 Lenovo ThinkSystem SR250 V2 network-attached storage keeps LifeLine 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