How to Recover Data from Synology Hybrid RAID

Synology Hybrid RAID (SHR)

SHR is Synology’s automated RAID management system. It groups usable portions of installed drives into protected storage when the drive combination permits it. It is useful if you expect to replace disks with larger ones over time. Before building or expanding a pool, check drive compatibility, estimate usable capacity, and maintain a separate backup. If files are missing, a synology hybrid raid data recovery attempt should start with a record of the current pool state and a copy of anything still readable.

• Flexibility in Mixing Drives: SHR can use disks of different capacities more efficiently than a conventional array constrained by its smallest member. This can help a NAS owner add capacity gradually, although usable capacity still depends on the drive sizes and selected protection level.
• Data Protection: SHR-1 is designed for one-disk fault tolerance, while SHR-2 is designed for two-disk fault tolerance when the configuration supports it. Redundancy helps with a supported drive failure, but it does not protect against every source of data loss.
• Ease of Use: DSM guides storage-pool configuration and presents capacity and protection choices. Users should still review the proposed layout before applying it, especially when reusing disks that already contain data.
• Efficient Storage Utilization: By arranging capacity into smaller groups, SHR can use more space from mixed-size disks than a simple one-size RAID layout. Check DSM for the recoverable and usable capacity of the exact disk set.
• Scalability: A pool can be expanded with compatible disks or by replacing disks in a supported order. Expansion and rebuild operations can take time, so perform a current backup and health check before starting.
• Compatibility with Traditional RAID: Synology NAS devices can also use standard RAID levels such as RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10. The better choice depends on available bays, disk sizes, performance needs, and recovery requirements.
• Recovery Options: DSM features, backups, compatible recovery software, and specialist services may be relevant in different incidents. The safe route depends on whether the issue is logical, configuration-related, or physical; no tool can guarantee a successful recovery.

How to create a Synology Hybrid RAID

Creating an SHR storage pool involves planning followed by the DSM wizard. Confirm that the NAS model, disks, and intended redundancy level are appropriate before storing data on the pool. If a disk already contains files you need, copy them elsewhere first: creating a pool can initialize or reconfigure the selected drives.

Requirements:

• A compatible Synology NAS device with the required number of bays.
• One or more compatible hard drives; use at least two disks when redundancy is needed.
• Access to Synology DiskStation Manager (DSM) and an up-to-date backup of important files.

Steps to Create a Synology Hybrid RAID:

1. 1. Install Hard Drives:

• Shut down the NAS if the model and installation procedure require it.
• Install the selected disks in the bays, ensuring each drive is seated properly and supported by the NAS model.
• Start the NAS and allow DSM to detect the installed hardware.

1. 2. Access Synology DiskStation Manager (DSM):

• Connect the NAS to the network it will use.
• Open DSM from the NAS address in a browser, or locate the device with Synology’s discovery tool.

1. 3. Open Storage Manager:

• After signing in, open Storage Manager from DSM’s main menu and review any existing warnings.

1. 4. Create a Storage Pool:

• Choose the Storage Pool area in Storage Manager.
• Select Create to start the pool creation wizard.
• Choose SHR where DSM offers the relevant storage-pool type, then select the protection option that suits the number of disks.
• Add only the drives intended for the new pool, and review DSM’s capacity and redundancy estimate before continuing.

1. 5. Configure the SHR Volume:

• Create a volume after defining the storage pool.
• Use DSM’s guided settings, or select custom settings when you need to review the options yourself.
• Name the volume and choose a supported file system, such as Btrfs or ext4, for the NAS model and use case.

1. 6. Finalize the Setup:

• Read the summary carefully, including the disks that will be used, then apply the configuration.
• Allow the initial build to finish. Its duration varies by NAS, disk size, workload, and selected configuration.

1. 7. Check the Health of Your SHR:

• Review Storage Manager after creating the pool and whenever DSM reports a warning.
• Monitor drive health, storage-pool status, and backups rather than waiting for a failure to reveal a problem.

Additional Tips:

• Data Backup: Keep a separate, tested backup before creating, expanding, or repairing a pool. RAID redundancy does not replace another copy.
• Drive Compatibility: Check Synology’s documentation and the NAS model’s limits before purchasing or installing replacement disks.
• Firmware Updates: Apply DSM and drive updates through a planned maintenance process. Do not use an update as the first response to an unstable array.

Once configured, SHR can balance capacity and redundancy in a straightforward way. The important operational habits are simple: keep backups current, monitor the pool, and verify the intended disk layout before making a storage change.

How Does Synology Hybrid RAID (SHR) Work?

SHR divides capacity into portions that can be combined into one or more protected RAID groups, then presents them as a storage pool in DSM. A mixed-size set can use space that a single classic RAID group would leave idle. DSM cannot create redundancy from an unmatched portion of one disk, so some capacity may remain unavailable.

1. Automatic RAID Management:

• Instead of requiring the user to assemble every underlying RAID group manually, DSM calculates a layout from the selected disks and requested SHR protection. This reduces routine setup work, but the user should still confirm the disks and options in the wizard.

2. Optimized Use of Mixed Drive Sizes:

• SHR is especially useful when disk capacities differ. Conventional RAID commonly limits an array to its smallest member; SHR can organize compatible capacity portions into additional protected groups when the disk combination allows it. This reduces unused space without making every size combination equivalent.

3. Data Redundancy:

• SHR-1 and SHR-2 use redundancy appropriate to their configuration. With two disks, SHR-1 can mirror data; with more disks, it can use parity-based protection. Redundancy can keep a supported pool available through the loss of the number of disks it was designed to tolerate, but it does not remove the need for backups.
  • Mirroring (SHR-1 with 2 drives): Two members can hold matching data, allowing the remaining member to retain access if the other fails.
  • Parity (SHR-1 with 3+ drives or SHR-2): Data and parity information are distributed across the member disks so that a supported failed-disk condition can be rebuilt after replacement.

4. Dynamic Volume Expansion:

• When the model and pool support it, DSM can add a disk or incorporate a larger replacement disk, then rebuild the protected layout. Capacity may not appear immediately, and the system should remain powered and monitored until the operation completes.

5. Efficient Storage Management:

• The aim is to balance usable capacity with the selected redundancy. Check the capacity calculator and Storage Manager for the result with a specific set of drives rather than relying on a generic estimate.

6. Compatibility and Flexibility:

• SHR is a Synology NAS feature, while shared data is normally provided through network services such as SMB, NFS, or FTP. Network file access does not make the disk layout a standard RAID layout, so preserve configuration information when a problem occurs.

Example Scenario:

• Using Drives of Different Sizes: With 2 TB, 3 TB, and 4 TB disks, a classic RAID 5 group uses a 2 TB portion of each. About 4 TB is available for data before overhead, while 2 TB provides parity. SHR-1 can protect an additional 1 TB portion shared by the two larger drives, for about 5 TB of nominal data capacity. The unmatched 1 TB on the largest disk remains unused. Check the exact result in Synology’s RAID Calculator.

Pros and Cons of SHR

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

Plan an SHR expansion based on the current pool status, not disk sizes alone. Check that the pool is healthy, confirm that the NAS supports the intended drives, and make a readable backup before starting. Synology’s calculator can estimate the gain, while Storage Manager provides the procedure for your DSM version. Let each repair finish before changing another disk, and check whether the volume needs expansion after the pool grows.

1. Assessing Current Setup:

• Review Storage Manager for the pool’s health, disk sizes, available bays, and whether it uses SHR-1 or SHR-2. Record warnings and the current configuration before changing hardware.

2. Choosing the Right Drives:

• Select disks supported by the NAS model. For practical capacity growth, a replacement or added disk normally needs to meet the size rules DSM displays for the existing pool.

3. Preparing for Expansion:

• Make or verify a separate backup of important data before starting; redundancy does not remove this requirement.
• Check DSM’s current guidance for the NAS model and defer the operation if the system is degraded or a drive has warnings.

4. Installing New Drives:

• Install a new disk in an available bay, or follow the model-specific replacement procedure when every bay is occupied.
• Start the NAS and confirm that DSM recognizes the disk before adding it to a pool.

5. Expanding the Storage Pool:

• Open Storage Manager and select the intended storage pool.
• Use the pool-management action DSM provides for adding or replacing a drive.
• Review the displayed disks, capacity, and redundancy before confirming the operation.
• Follow DSM’s guidance and allow it to rebuild the pool without interrupting power or removing other disks.

6. Volume Expansion:

• After the pool has additional available capacity, check whether the associated volume also needs expansion.
• Select the intended volume in Storage Manager and review the size change before applying it.
• Confirm the new capacity only after DSM reports that the operation completed normally.

7. Rebuilding the Array:

• DSM may rebuild or reorganize the protected layout after an expansion. The duration depends on the hardware, disk sizes, array activity, and amount of data, so keep the NAS powered and avoid unrelated storage changes.

8. Monitoring the Process:

• Monitor Storage Manager for progress and warnings. If it reports a disk, pool, or file-system issue, preserve the state and investigate the warning rather than making multiple corrective changes.

9. Verification:

• When the operation completes, verify the pool and volume status, confirm the expected capacity, and test that backups still run and restore as intended.

A successful expansion leaves the pool healthy, expected capacity available, and an independent backup intact. SHR’s flexibility is safest when each disk change is a single, observed maintenance step.

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

Choose between SHR and traditional RAID configurations by considering the disks you have, the capacity you need, and the failures the pool must tolerate. SHR lets DSM plan a protected layout and can use mixed disk sizes more efficiently. A classic RAID level gives the administrator a specific layout to manage. Neither choice replaces a separate backup.

Flexibility and Ease of Use:

• SHR: DSM handles much of the layout planning and is practical when a NAS contains mixed-size disks or will be expanded in stages.
• Classic RAID: A conventional level gives an administrator direct control over the selected layout, but capacity planning and disk matching usually require more hands-on work.

Storage Efficiency:

• SHR: DSM can place matching extra portions of larger drives into additional protected groups. Space left on only one drive may still remain unused.
• Classic RAID: A single group generally uses each member only up to the capacity of the smallest drive. With unequal disks, that can leave more space outside the array.

Performance:

• SHR: Performance depends on the NAS model, disks, workload, and underlying layout DSM creates; mixed disks may not behave like a matched set.
• Classic RAID: A deliberately selected, matched RAID configuration can make performance characteristics easier to predict for a defined workload.

Scalability:

• SHR: It is designed for supported incremental changes, such as adding disks or replacing members with larger compatible drives.
• Classic RAID: Expansion options vary by level and platform, and equal-sized replacements are often necessary to unlock additional capacity.

Data Redundancy:

• SHR: SHR-1 and SHR-2 provide one- or two-disk fault tolerance when their configuration requirements are met.
• Classic RAID: Standard levels offer different protection trade-offs, from no redundancy in RAID 0 to mirrored or parity-based options such as RAID 1, 5, 6, and 10.

Compatibility:

• SHR: The storage-management format is intended for Synology NAS systems, so preserve DSM configuration details if the disks require specialist attention.
• Classic RAID: Standard RAID concepts are used across many operating systems, controllers, and NAS products, although their on-disk implementation can still differ by platform.

Ideal Use Cases:

• SHR: It suits many home and small-business NAS owners who value mixed-drive flexibility and guided management.
• Classic RAID: It suits environments where a specific, deliberately engineered RAID layout or platform-wide compatibility is the primary requirement.

There is no general winner. Select SHR when Synology’s guided capacity management and staged expansion suit the NAS plan; select a classic RAID level when its explicit layout, performance model, or cross-platform requirements better suit the workload. In either case, maintain a backup separate from the array.

Use DiskInternals RAID Recovery

Before scanning the NAS drives, check the Recycle Bin, snapshots, backups, and Storage Manager status. If those options do not restore the files, DiskInternals RAID Recovery may be worth evaluating when the member disks are readable and the software recognizes this SHR layout. The video shows the software workflow; the result of any scan still depends on drive health and whether the missing data has been overwritten.

1. Prepare for Recovery:

• Identify the loss: Note whether files were deleted, a disk failed, or the pool became inaccessible. Record the DSM status and avoid new writes to the affected pool. If it is still readable, copy priority files before changing hardware.
• Install DiskInternals RAID Recovery: Download and install DiskInternals RAID Recovery on a Windows computer.

2. Connect NAS Drives to Your Computer:

• Record each disk’s original bay and serial number before removing it. Connect the required member drives to the Windows recovery computer without accepting any prompt to initialize or format them. If a disk is unstable or physically damaged, seek specialist advice before repeated scans.

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:

• Check that the software identifies the member disks, their order, and the file system. Do not guess at missing RAID parameters. If feasible, create disk images and scan those copies while leaving the original drives unchanged.
• 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.
• Save the selected files to another disk with enough space, never back to the affected pool. Open a sample on the destination to confirm that the copy is usable before returning the NAS to service.

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.

Synology hybrid raid recovery is straightforward when a readable backup exists, but an inaccessible pool has no guaranteed outcome. If several drives have failed, the layout cannot be identified, or the scan finds no usable files, pause for a case-specific assessment. The separate guide explains how to fix Broken or Crashed Synology RAID Set.

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.