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Last updated: Apr 30, 2024

How to Recover Data from Synology Hybrid RAID

Synology Hybrid RAID (SHR) is a distinctive and innovative RAID technology, meticulously crafted for Synology NAS (Network Attached Storage) systems. Designed to merge flexibility, efficiency, and user-friendliness, SHR excels in maximizing storage potential while bolstering data security. Despite its advanced and resilient architecture, encountering data loss in SHR systems is still a possibility, arising from issues such as hardware malfunctions, unintentional file deletions, or software complications. This article offers an in-depth exploration of Synology Hybrid RAID, elucidating how it operates, its benefits, and how it distinguishes itself from conventional RAID technologies.

This comprehensive guide aims to arm you with the necessary knowledge and skills to confidently handle data loss incidents in SHR configurations. Whether you are a seasoned IT professional or a Synology NAS user looking to secure your digital assets, this article will equip you with the insights and tools required for proficient data recovery in SHR environments. Let’s dive into the world of Synology Hybrid RAID, preparing you to adeptly navigate through data loss challenges.

Synology Hybrid RAID (SHR)

Synology Hybrid RAID (SHR) is an automated RAID (Redundant Array of Independent Disks) management system, which is exclusive to Synology NAS (Network Attached Storage) devices. SHR is designed to make storage and volume management much easier, especially for individuals and businesses without extensive knowledge of RAID configurations. Here are the key aspects of SHR:

  • Flexibility in Mixing Drives: Unlike traditional RAID setups that require all drives to be of the same size, SHR allows for the use of drives of different sizes without wasting storage space. This flexibility is particularly advantageous for users who want to expand their storage capacity over time or utilize existing drives.
  • Data Protection: SHR provides one or two-disk redundancy, safeguarding data against the failure of up to two hard drives. This means that even if one (or two, in the case of SHR-2) drives fail, the data remains intact and accessible.
  • Ease of Use: SHR automates the RAID configuration process. Users don’t need to understand the complexities of different RAID levels. They can simply add drives to the pool, and SHR intelligently manages the configuration for optimal storage utilization and data protection.
  • Efficient Storage Utilization: SHR maximizes the storage capacity, especially when using drives of different sizes. It combines smaller disks to create larger storage volumes and uses the larger disks for redundancy or additional storage.
  • Scalability: With SHR, you can start with a smaller setup and expand your storage capacity as your needs grow. Adding new drives or replacing smaller drives with larger ones is straightforward, and SHR handles the integration of these new drives into the existing setup.
  • Compatibility with Traditional RAID: For those who prefer traditional RAID setups, Synology NAS devices also support standard RAID levels like RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10.
  • Recovery Options: In case of data loss due to drive failure or other reasons, SHR offers various recovery options. Synology's DSM (DiskStation Manager) provides tools for data recovery, and there are also third-party tools and professional services that specialize in data recovery from RAID systems, including SHR.

How to create a Synology Hybrid RAID

Creating a Synology Hybrid RAID (SHR) is a straightforward process, especially if you're familiar with the basics of using a Synology NAS (Network Attached Storage) device. Here's a step-by-step guide to setting up an SHR on your Synology NAS:


  • A Synology NAS device.
  • At least one hard drive (though two are recommended for redundancy).
  • Access to the Synology DiskStation Manager (DSM) software.

Steps to Create a Synology Hybrid RAID:

  1. 1. Install Hard Drives:

  • Power off your Synology NAS.
  • Insert one or more hard drives into the drive bays. For SHR, these drives can be of different sizes.
  • Power on the NAS.
  1. 2. Access Synology DiskStation Manager (DSM):

  • Connect your NAS to your network.
  • Access DSM by entering the IP address of your NAS in a web browser, or use the Synology Assistant tool to find your NAS on the network.
  1. 3. Open Storage Manager:

  • Once logged into DSM, open the ‘Storage Manager’ application from the main menu.
  1. 4. Create a Storage Pool:

  • In Storage Manager, go to the 'Storage Pool' section.
  • Click ‘Create’. This will start the storage pool creation wizard.
  • Select ‘Better performance’ (which represents SHR) as the type of storage pool.
  • Add the drives you wish to include in the SHR. The wizard will show how much space will be used for data and how much for redundancy.
  1. 5. Configure the SHR Volume:

  • After creating the storage pool, you will be prompted to create a volume.
  • Choose 'Custom' to manually configure the volume settings, or select 'Quick' to let DSM handle the configuration.
  • Assign a name to your volume and specify the file system (e.g., Btrfs or ext4).
  1. 6. Finalize the Setup:

  • Review your settings and click ‘Apply’ to create the SHR volume.
  • The NAS will then start building the SHR volume. This process might take several hours, depending on the size and number of drives.
  1. 7. Check the Health of Your SHR:

  • Once the SHR volume is created, it's a good practice to periodically check its health.
  • Use the Storage Manager to monitor the status of your drives and the SHR volume.

Additional Tips:

  • Data Backup: Before creating an SHR, especially if you are reusing drives that contain data, ensure that you have a backup of any important data.
  • Drive Compatibility: Check that the drives you are using are compatible with your Synology NAS model.
  • Firmware Updates: Ensure your Synology NAS is running the latest DSM version for optimal performance and security.

By following these steps, you should have a fully functional Synology Hybrid RAID setup, providing a balance of data protection and efficient storage use. Remember, SHR is designed to be user-friendly, so even users with limited technical knowledge can set up and manage their RAID configuration easily.

How Does Synology Hybrid RAID (SHR) Work?

Synology Hybrid RAID (SHR) is an innovative RAID management system designed to simplify storage management and optimize efficiency, especially in mixed-drive environments. Here's an overview of how SHR works:

1. Automatic RAID Management:

  • Unlike traditional RAID configurations that require manual setup and specific knowledge of RAID levels, SHR automates the RAID setup process. When you add drives to a Synology NAS, SHR automatically manages the RAID configuration, making decisions based on the number and size of the drives inserted.

2. Optimized Use of Mixed Drive Sizes:

  • One of the key features of SHR is its ability to efficiently utilize drives of different sizes. In traditional RAID setups (like RAID 1, 5, or 10), all drives must be of the same size, or else the extra space on larger drives is wasted. SHR, however, can combine smaller drives to match the capacity of larger ones, maximizing the usable storage space.

3. Data Redundancy:

  • SHR offers one or two-disk redundancy, similar to RAID 1 or RAID 5/6. With one-disk redundancy (SHR-1), your data is protected against the failure of a single drive. With two-disk redundancy (SHR-2), it can withstand the failure of two drives. This redundancy is achieved by mirroring or parity:
    • Mirroring (SHR-1 with 2 drives): Data is duplicated across two drives. If one fails, the other still contains all the data.
    • Parity (SHR-1 with 3+ drives or SHR-2): Data is spread across the drives, along with parity information. This allows the system to reconstruct lost data in the event of a drive failure.

4. Dynamic Volume Expansion:

  • SHR allows for easy volume expansion. You can start with fewer or smaller drives and expand the storage pool by adding new drives or replacing existing drives with larger ones. SHR automatically integrates new drives into the existing pool, redistributing data and parity information to take advantage of the additional capacity.

5. Efficient Storage Management:

  • SHR is designed to be efficient in both storage capacity and data protection. It calculates the most effective way to use the available drive space while ensuring that data is protected against drive failure.

6. Compatibility and Flexibility:

  • While SHR is exclusive to Synology NAS systems, the data stored on an SHR volume can be accessed through standard network protocols (e.g., SMB, NFS, FTP). This makes SHR a flexible solution for various applications and environments.

Example Scenario:

  • Using Drives of Different Sizes: Imagine you have three drives of 2TB, 3TB, and 4TB. In a traditional RAID, you'd be limited to the smallest drive size for all drives (2TB each), resulting in 6TB of total usable space in a RAID 5 setup. With SHR, however, you can effectively use more of the total capacity, potentially getting closer to 7-9TB of usable space while still having redundancy.

Pros and Cons of SHR

Pros of SHRCons of SHR
Flexibility with Mixed Drive Sizes: SHR allows the use of drives of different sizes in the same RAID setup without wasting storage space.Limited to Synology: SHR is proprietary and only available on Synology NAS devices, limiting its usage to those specific models.
Automated RAID Management: SHR simplifies the RAID configuration process, making it accessible even to users without deep technical knowledge of RAID systems.Less Customization: Advanced users might find SHR less customizable compared to manually configuring traditional RAID setups.
Efficient Storage Utilization: Maximizes the storage capacity, especially beneficial when incorporating drives of varying sizes.Potential Performance Issues: In some configurations, especially with mixed drive sizes, SHR might offer slightly less performance than traditional RAID setups.
Easy Scalability: Users can easily expand their storage pool by adding new drives or replacing smaller drives with larger ones. SHR integrates these seamlessly.Dependency on Synology Ecosystem: Users become dependent on Synology's ecosystem and software updates for maintenance and support.
Data Redundancy: Offers one or two-disk redundancy (similar to RAID 1, 5, or 6), protecting data against drive failures.Recovery Complexity: Data recovery from an SHR setup, especially with mixed drive sizes, can be more complex than from standard RAID configurations.
User-Friendly Interface: Synology's DSM provides an intuitive interface for managing SHR, making monitoring and maintenance straightforward.Not Ideal for All RAID Needs: For specific RAID configurations or performance requirements, traditional RAID might still be preferable.

How Does Synology Hybrid RAID (SHR) Optimize Storage Space?

Synology Hybrid RAID (SHR) is engineered to maximize the effective use of storage space, particularly in environments where hard drives of varying sizes are employed. This optimization sets SHR apart from traditional RAID configurations, which typically require uniform drive sizes, often leading to underutilized disk space. The key to SHR's space efficiency lies in its intelligent approach to managing disparate drive capacities.

Understanding Traditional RAID Limitations:

In a standard RAID configuration (like RAID 1, 5, or 10), all drives need to be of the same capacity. If they are not, the RAID array is limited by the size of the smallest drive. For example, in a RAID 1 setup with a 2TB and a 4TB drive, only 2TB from each drive is usable, resulting in 2TB of mirrored storage and 2TB of wasted space on the larger drive.

SHR's Approach to Mixed Drive Sizes:

SHR overcomes this limitation by intelligently managing drives of different sizes. It does this through a two-step process:

  1. 1. Partitioning Drives into Smaller Units:

  • SHR partitions larger drives into smaller, equal-sized units that match the capacity of the smallest drive in the NAS.
  • For instance, in a NAS with 2TB, 3TB, and 4TB drives, SHR might partition the 3TB and 4TB drives into segments of 2TB each (the size of the smallest drive) and additional segments with the remaining capacities.
  1. 2. Creating Multiple RAID Arrays:

  • SHR then creates multiple RAID arrays across these partitions.
  • The first set of partitions (2TB from each drive in the example) forms the first RAID array, ensuring data redundancy.
  • The remaining partitions (if any) are used to create additional RAID arrays. In our example, there would be additional arrays from the remaining 1TB partition of the 3TB drive and the 1TB and 2TB partitions of the 4TB drive.

Dynamic Storage Expansion:

SHR is dynamic. When a new drive is added or an existing drive is replaced with a larger one, SHR can reconfigure the storage pool to include the additional space. This process is done without user intervention and ensures that no space is wasted.

Advantages of SHR's Approach:

  1. 1. Maximized Storage Utilization:
  • By partitioning and creating multiple RAID arrays, SHR effectively uses the entire capacity of each drive, minimizing wasted space.
  1. 2. Flexibility:
  • Users can add drives of any size at any time, making SHR ideal for gradual upgrades and expansion.
  1. 3. Data Redundancy:
  • SHR maintains redundancy (similar to RAID 1 or 5), protecting against single or double drive failures (depending on whether SHR-1 or SHR-2 is used).

Illustrative Example:

Imagine a scenario with a Synology NAS having three drives of 2TB, 3TB, and 4TB. Traditional RAID would limit the array to 6TB total (using 2TB from each drive). With SHR:

  • The first 2TB of each drive is combined into one RAID array, making 6TB with redundancy.
  • The remaining 1TB of the 3TB drive and the 2TB and another 1TB segments of the 4TB drive are used to create additional RAID arrays, increasing the total usable capacity beyond the 6TB limit of traditional RAID, while still maintaining data protection.

In summary, Synology's SHR technology offers a more efficient and flexible approach to storage management, especially useful for NAS users who plan to expand their storage capacity over time or have a collection of different-sized drives. This intelligent management of drive space maximizes storage capacity while still ensuring data redundancy and protection.

Tip: SHR vs. RAID

How To Increase the Storage Space in Synology Hybrid RAID (SHR)?

Expanding the storage capacity of a Synology Hybrid RAID (SHR) setup is a user-friendly process that allows you to adapt to increasing storage needs over time. SHR's design is particularly accommodating for upgrades, even when using drives of different sizes. Here’s a step-by-step guide on how to enhance the storage space in your SHR configuration:

1. Assessing Current Setup:

  • Before proceeding, it's important to review your current SHR setup in the Synology DiskStation Manager (DSM). Check the number of bays available, the size of the existing drives, and the current RAID type (SHR-1 or SHR-2).

2. Choosing the Right Drives:

  • Select new hard drives for expansion. Ensure they are compatible with your Synology NAS model. The drives should be of equal or larger size than the smallest drive in your existing setup for optimal space utilization.

3. Preparing for Expansion:

  • Back up your data. Although SHR expansion is generally safe, having a backup is a prudent precaution against unforeseen issues.
  • Ensure your Synology NAS is running the latest version of DSM.

4. Installing New Drives:

  • Power off your NAS and install the new drives in the empty bays. If all bays are occupied, you can replace existing drives one at a time with larger ones.
  • Power on your NAS after installing the new drives.

5. Expanding the Storage Pool:

  • In DSM, open the Storage Manager.
  • Navigate to the 'Storage Pool' section, and select the storage pool you wish to expand.
  • Click on ‘Add Drive’ or ‘Replace Drive’ to start the expansion process.
  • Follow the on-screen instructions to integrate the new drive(s) into your SHR volume. The system will guide you through adding or replacing drives.

6. Volume Expansion:

  • After adding the new drives to the storage pool, you may also need to expand the volume to utilize the newly added storage space.
  • In the Storage Manager, go to the 'Volume' section and select the volume you want to expand.
  • Click on ‘Expand Volume’ and follow the prompts to increase the volume size.

7. Rebuilding the Array:

  • Once the new drives are added, the SHR will begin rebuilding the array to include the new drives. This process can take several hours or longer, depending on the size of the drives and the amount of data.

8. Monitoring the Process:

  • During the expansion and rebuilding process, it's essential to monitor the progress through DSM. Ensure there are no errors, and the process completes successfully.

9. Verification:

  • After the expansion process is complete, verify the new storage capacity in the Storage Manager. Ensure that the system is stable and the data integrity is maintained.

By following these steps, you can seamlessly expand the storage capacity of your Synology Hybrid RAID, making room for more data while maintaining the integrity and redundancy of your existing setup. This flexibility is one of the key advantages of using SHR in a Synology NAS environment.

Is Synology Hybrid RAID (SHR) Capable of Fault Tolerance?

Yes, Synology Hybrid RAID (SHR) is specifically designed to provide fault tolerance, safeguarding data against potential drive failures. This feature is a cornerstone of SHR's functionality, ensuring data protection and system reliability even in the event of hardware malfunctions. Here's a breakdown of how SHR achieves fault tolerance:

1. Redundancy Mechanism:

  • Similar to traditional RAID configurations, SHR uses redundancy to protect against drive failure. It creates duplicates of data (in SHR-1) or parity blocks (in SHR-2) across multiple drives. This redundancy allows the system to rebuild lost data if one or two drives (depending on the SHR type) fail.

2. SHR-1 and SHR-2 Configurations:

  • SHR-1: This configuration is analogous to RAID 1 or RAID 5. It provides fault tolerance against the failure of one drive. In the event of a drive failure, the system continues to operate normally, and data remains accessible while the failed drive is replaced.
  • SHR-2: Similar to RAID 6, this configuration offers enhanced fault tolerance by protecting against the failure of two drives simultaneously. It's ideal for larger arrays where the risk of a second drive failing before the first failed drive is replaced is higher.

3. Dynamic RAID Management:

  • SHR dynamically manages the RAID configuration, which includes handling drive failures and rebuilding the array with replacement drives. This management ensures continuous protection and minimal user intervention in maintaining fault tolerance.

4. Flexible Drive Replacement:

  • SHR allows for the replacement of failed drives with new ones, which can be of equal or larger size than the failed drive. The system automatically integrates the new drive into the array and restores redundancy.

5. Data Integrity During Drive Failure:

  • Even during a drive failure and the subsequent rebuilding process, SHR ensures that data integrity is maintained, and the risk of data loss is minimized.

6. Regular Health Checks:

  • Synology's DiskStation Manager (DSM) software provides tools for regular monitoring and health checks of hard drives. This proactive approach helps in identifying potential drive issues before they lead to failure.

In conclusion, SHR’s design offers robust fault tolerance capabilities, making it a reliable choice for both individual users and businesses concerned with data security and system resilience. By providing flexible redundancy options and seamless integration of replacement drives, SHR ensures that data remains protected in various failure scenarios.

Comparing SHR and Classic RAID: Which is the Optimal Choice?

When deciding between Synology Hybrid RAID (SHR) and traditional RAID configurations, it's essential to consider their respective strengths and limitations to determine which is better suited to your specific needs. Both have unique features and cater to different requirements. Here’s a comparative analysis to help you make an informed decision:

Flexibility and Ease of Use:

  • SHR: Known for its flexibility, especially with mixed-size drives, and automated RAID management, making it user-friendly and ideal for those who prefer a simpler setup process.
  • Classic RAID: Requires manual configuration and identical drive sizes for optimal performance, favoring users who seek more control over their RAID setup and have specific performance requirements.

Storage Efficiency:

  • SHR: Maximizes storage efficiency, especially in systems with drives of different sizes, reducing wasted disk space.
  • Classic RAID: In configurations like RAID 1, 5, or 6, the storage capacity is limited to the size of the smallest drive, potentially leading to underutilized space.


  • SHR: Offers reliable performance, though it may slightly vary in systems with mixed drive sizes.
  • Classic RAID: Typically provides predictable and consistent performance, particularly important in environments with high data throughput requirements.


  • SHR: Highly scalable, allowing for easy expansion by adding or replacing drives with larger ones without worrying about uniform sizes.
  • Classic RAID: Scalability is limited by the need for uniform drive sizes; replacing with larger drives requires replacing all drives in the array.

Data Redundancy:

  • SHR: Offers flexible redundancy options (SHR-1 and SHR-2), similar to RAID 1/5/6, providing good protection against drive failures.
  • Classic RAID: Provides various levels of redundancy, depending on the RAID level chosen (e.g., RAID 1, 5, 6, 10).


  • SHR: Exclusive to Synology NAS systems, limiting its use to Synology environments.
  • Classic RAID: Widely compatible with various hardware and NAS systems, offering greater versatility.

Ideal Use Cases:

  • SHR: Best suited for home users, small businesses, or those who need an easy-to-manage, flexible storage solution with mixed drive sizes.
  • Classic RAID: Ideal for enterprise environments, specialized applications, or scenarios where consistent performance and specific RAID configurations are crucial.

The choice between SHR and classic RAID depends on your specific requirements. SHR excels in flexibility, ease of use, and storage efficiency, making it ideal for a broad range of users. In contrast, classic RAID configurations offer more control, consistent performance, and are better suited for environments with specific data throughput and redundancy needs.

Details on Data Recovery in Synology Hybrid RAID (SHR)

When it comes to recovering data from a Synology Hybrid RAID (SHR) setup, understanding the specifics of the process is crucial. SHR, with its unique approach to RAID management, presents specific considerations and steps for effective data recovery. Here’s a closer look at what's involved in the recovery process for SHR systems:

Understanding SHR's Complexity:

  • Mixed-Size Drives: SHR's ability to handle drives of different sizes can add complexity to the recovery process, especially compared to traditional RAID systems with uniform drive sizes.
  • Dynamic RAID Configuration: SHR's automated RAID management means that the configuration can vary significantly based on the number and size of the drives used.

Preliminary Steps:

  • Diagnosing the Issue: Identifying the root cause of data loss is the first step, whether it's due to hardware failure, accidental deletion, or software issues.
  • Safe Mode Operation: Before attempting recovery, it's advisable to operate the NAS in a safe mode, if available, to prevent further data loss.

SHR Data Recovery Approaches:

  1. 1. Using Synology's Tools: Synology's DiskStation Manager (DSM) software includes built-in tools for data recovery. These tools can help in scenarios like accidental file deletion or minor corruption.
  2. 2. Professional Data Recovery Services: In more complex cases, such as multiple drive failures or severe data corruption, seeking professional data recovery services is recommended. These services have expertise in dealing with SHR configurations.
  3. 3. Third-Party Recovery Software: There are various third-party software options available that can assist in SHR data recovery. It's important to choose software that specifically supports SHR and Synology NAS systems, like DiskInternals RAID Recovery.

Important Considerations:

  • Data Backup: Always keep regular backups. Having a backup can significantly simplify the recovery process and reduce the risk of permanent data loss.
  • Drive Handling: Be cautious when handling physical drives, especially if hardware failure is suspected. Mishandling can further damage the drives and complicate recovery.
  • Firmware and Software Updates: Ensure that your Synology NAS and DSM are updated to the latest versions before initiating recovery, as updates can resolve certain issues and improve recovery chances.

Post-Recovery Actions:

  • Verify Data Integrity: After recovery, verify the integrity and completeness of the recovered data.
  • Review RAID Setup: Consider reviewing your SHR setup to enhance data protection, such as upgrading to SHR-2 for additional redundancy or reassessing your backup strategy.

Circumstances Necessitating Recovery in Synology Hybrid RAID (SHR) Systems

Recovery in Synology Hybrid RAID (SHR) setups becomes necessary under certain conditions where data accessibility is compromised. Understanding when to initiate recovery processes is crucial for maintaining data integrity and system functionality in SHR environments. Here are typical scenarios that may require recovery efforts in SHR configurations:

1. Drive Failures:

  • One of the most common triggers for SHR recovery is the failure of one or more drives in the RAID array. While SHR can tolerate the failure of one (SHR-1) or two (SHR-2) drives without data loss, recovery is needed to restore full redundancy and functionality.

2. Accidental Data Deletion or Modification:

  • Instances of inadvertently deleting files or folders, or making unintended modifications, can necessitate a recovery process to restore the lost or altered data.

3. File Corruption:

  • Corruption of files due to software errors, virus attacks, or other unforeseen issues can lead to the need for data recovery to retrieve the original, uncorrupted files.

4. System Failures or Crashes:

  • If the Synology NAS experiences a system failure or crashes due to hardware or software issues, this can result in data becoming inaccessible, thus triggering a recovery process.

5. Power Surges or Outages:

  • Unexpected power issues like surges or outages can cause data loss or corruption, especially if the NAS was writing data at the time of the incident.

6. Natural Disasters or Physical Damage:

  • Events such as floods, fires, or other physical damage to the NAS device can lead to a loss of data, necessitating a recovery process.

7. RAID Configuration Errors:

  • Mistakes in configuring or modifying the RAID setup can sometimes lead to data loss or access issues, requiring recovery efforts to rectify.

8. Hardware Upgrades or Replacements:

  • During processes like upgrading or replacing drives, data can occasionally be lost or compromised, especially if proper procedures are not followed.

Simple Steps to Retrieve Deleted or Lost Data from SHR-Based Synology NAS

Use DiskInternals RAID Recovery

To retrieve deleted or lost data from an SHR-based Synology NAS using DiskInternals RAID Recovery, you can follow these simple steps. DiskInternals RAID Recovery is a third-party software designed to recover data from various RAID configurations, including Synology Hybrid RAID (SHR). Here’s how to use it:

1. Prepare for Recovery:

  • Assess the Data Loss: Determine the type of data lost (deleted files, corrupted data, etc.) and the cause, if known.
  • Install DiskInternals RAID Recovery: Download and install DiskInternals RAID Recovery on a Windows computer.

2. Connect NAS Drives to Your Computer:

  • If possible, directly connect the drives from your Synology NAS to your Windows computer. This might require a SATA to USB adapter or a similar interface.

3. Launch DiskInternals RAID Recovery:

  • Open the DiskInternals RAID Recovery software.
  • The software might automatically detect the connected RAID array. If not, you can manually configure the RAID parameters.

4. RAID Configuration and Scan:

  • Follow the software’s wizard to properly configure the RAID. For SHR, select parameters that match your NAS setup.
  • Start the scanning process. The software will search for lost or deleted data on the NAS drives.

5. Preview Recoverable Files:

  • Once the scan is complete, browse through the recoverable files. DiskInternals RAID Recovery allows you to preview files before recovery.

6. Select and Recover Data:

  • Choose the files or folders you wish to recover.
  • Specify a location on your computer or another external storage device to save the recovered data. Avoid saving the data back to the NAS during recovery to prevent data overwriting.

7. Post-Recovery Process:

  • After recovery, verify the integrity of the retrieved data.
  • If the NAS drives were physically removed, safely reinstall them in your Synology NAS.
  • Perform any necessary configurations on your NAS to return it to its normal operational state.

8. Backup and Prevention Strategies:

  • Consider implementing or enhancing backup solutions for your NAS to prevent future data loss.
  • Regularly monitor the health of your NAS drives and backup systems.

By using DiskInternals RAID Recovery, you can effectively recover lost or deleted data from your SHR-based Synology NAS. This tool is particularly useful for complex data recovery scenarios where standard methods may not be sufficient. Remember, handling RAID configurations and data recovery can be risky, so proceed with caution and consider professional assistance if the process seems too daunting. Learn more on how to fix Broken or Crashed Synology RAID Set.

How to migrate from SHR to SHR2

Migrating from SHR (Synology Hybrid RAID) to SHR-2 on a Synology NAS is a process that enhances your data redundancy, protecting against the failure of two drives instead of just one. The process involves upgrading your existing SHR volume to SHR-2, which requires additional disk space. Here's how to do it:


  • Sufficient Drives: Ensure you have enough drives in your NAS. SHR-2 requires at least four drives to function.
  • Backup: Before making any changes to your RAID configuration, back up all important data to prevent accidental loss.

Steps to Migrate from SHR to SHR-2:

  1. Verify Current Setup:

    • Log into your Synology DiskStation Manager (DSM).
    • Check your current SHR setup in the Storage Manager to ensure it's healthy and to understand your current configuration.
  2. Add Additional Drives (if needed):

    • If you don’t have enough drives to support SHR-2, you will need to add more. Power down your NAS, insert the new drives, and then power it back on.
    • The new drives should be of equal or larger size than the smallest drive in the existing array.
  3. Expand the Storage Pool:

    • In DSM, go to the Storage Manager.
    • Expand your existing storage pool to include the new drives, if you added any. This is done by selecting the storage pool and clicking on "Manage" to add the new drives.
  4. Convert to SHR-2:

    • Still in the Storage Manager, select the storage pool you wish to convert.
    • Click on the 'Configuration' button, and then choose 'Change RAID Type'.
    • Select 'SHR-2' from the list of available options.
    • Follow the prompts to start the conversion process.
  5. Rebuilding the Array:

    • The conversion process involves rebuilding the RAID array to distribute data across the drives with the added redundancy. This can take a considerable amount of time, especially if you have a lot of data and/or large drives.
    • During this time, your NAS will still be operational, but performance may be impacted.
  6. Monitor the Process:

    • Regularly check the progress in the Storage Manager. Ensure there are no errors during the rebuilding process.
  7. Post-Conversion Checks:

    • Once the conversion process is complete, verify the RAID type has changed to SHR-2 in the Storage Manager.
    • Perform a health check of the drives and the overall system to ensure everything is functioning correctly.
  8. Update Backup Strategy:

    • After successful migration, consider updating your backup strategy to reflect the new storage configuration.

Migrating from SHR to SHR-2 increases your NAS's fault tolerance, making your data more secure against multiple drive failures. Remember, while your data should be safe during this process, having a current backup is crucial in case of unexpected issues. This process can be lengthy and resource-intensive, so plan accordingly to minimize disruption.

How to recover data from Synology Hybrid RAID-2

Recovering data from a Synology Hybrid RAID-2 (SHR-2) setup, particularly when facing drive failures or data corruption, involves several steps. SHR-2, similar to RAID 6, can tolerate the failure of up to two drives without data loss. Here’s a guide to recovering your data:

1. Assess the Situation:

  • Identify the Problem: Determine whether the issue is due to drive failure, accidental deletion, or corruption.
  • Check Drive Status: Use Synology's DiskStation Manager (DSM) to check the status of your drives. If one or two drives have failed, SHR-2 should still protect your data.

2. Attempt Basic Recovery:

  • If the problem is accidental deletion or a minor issue, check the Synology Recycle Bin or use DSM’s File Station to recover files.
  • For minor corruption, DSM may offer tools to repair the volume or file system.

3. Replace Failed Drives (if applicable):

  • If one or two drives have failed, replace them with new ones of equal or larger capacity.
  • The system will start rebuilding the data onto the new drives, a process that can take a considerable amount of time depending on the size of the drives and the amount of data.

4. Use Built-In Recovery Tools:

  • Synology’s DSM includes tools like Hyper Backup and Snapshot Replication, which can be used to restore data from backups.
  • If you have a backup, you can restore your data from it.

5. Third-Party Data Recovery Software:

  • For more complex situations, consider using third-party data recovery software that supports Synology NAS systems and RAID configurations.
  • Ensure the software is compatible with SHR-2 and the file system used on your NAS.

6. Professional Data Recovery Services:

  • In cases of severe drive damage or complex data loss scenarios, it might be necessary to seek professional data recovery services.
  • Choose a service experienced with RAID systems, particularly those familiar with Synology devices.

7. Post-Recovery Actions:

  • After recovering your data, verify its integrity and completeness.
  • Run a health check on your NAS to ensure all drives are functioning correctly and the SHR-2 setup is stable.

8. Enhance Data Protection Measures:

  • Review and enhance your backup and data protection strategies.
  • Consider implementing regular scheduled backups and using features like Snapshot Replication for added security.

In summary, recovering data from an SHR-2 setup involves diagnosing the issue, replacing any failed drives, and using the tools available within DSM or third-party software for recovery. The robustness of SHR-2 provides a good level of protection, but having regular backups and a solid data protection plan is crucial for minimizing data loss risks.


The Synology Hybrid RAID (SHR) system presents a flexible and user-friendly solution for managing storage in Synology NAS devices, balancing ease of use with efficient data protection. Its ability to accommodate mixed drive sizes and automatically manage RAID configurations makes it an ideal choice for a wide range of users, from home environments to small businesses.

Key Takeaways:

  • SHR's Flexibility and Efficiency: SHR stands out for its ability to efficiently use drives of different sizes, maximizing storage capacity without the complex setup typically associated with traditional RAID systems.
  • Data Protection with SHR-1 and SHR-2: SHR offers robust data protection options. SHR-1 provides single-drive failure protection, similar to RAID 5, while SHR-2, akin to RAID 6, offers additional security by tolerating two simultaneous drive failures.
  • Ease of Storage Expansion: Expanding storage capacity in an SHR setup is relatively straightforward, allowing for easy scalability as storage needs grow.
  • Recovery Options: While SHR configurations provide a level of fault tolerance, data loss can still occur due to various reasons. Synology offers built-in tools for basic recovery needs, and third-party software or professional services can be sought for more complex recovery scenarios.
  • Migration to SHR-2 for Enhanced Redundancy: For those needing greater redundancy, migrating from SHR to SHR-2 is a viable option, especially for larger arrays where the likelihood of multiple drive failures is higher.
  • Regular Backups are Crucial: Despite the redundancy and fault tolerance of SHR and SHR-2, regular backups remain essential. They are the most reliable safeguard against data loss from unforeseen events like catastrophic drive failures or natural disasters.

Final Thoughts:

Synology's Hybrid RAID technology offers a harmonious blend of user-friendliness, flexibility, and robust data protection. Its design caters to a range of users, simplifying RAID management without compromising on key features like scalability and fault tolerance. However, as with any RAID system, SHR is not a substitute for regular backups. The importance of a comprehensive backup strategy cannot be overstated for ensuring data integrity and availability, especially in critical or sensitive data scenarios. Whether you're a home user or managing a small business, understanding and utilizing the full capabilities of SHR can lead to a more efficient and secure data management experience.

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