NAS Synology ioSafe 1515+ RAID Arrays: Recovering Data After Natural Wear of Components

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Synology ioSafe 1515+
• How to Remove Hard Disks from Your NAS and Connect Them to a PC
  • Step-by-Step Data Recovery with Hetman RAID Recovery
  • How to Safely Recover Data from Disk Images
  • Where Are the User’s Files Actually Stored?
  • RAID Recovery Software: Detailed Comparison

Why Regular Data Recovery Tools Can’t Restore Files from RAID

Conventional hard drives store user data by writing it sequentially across the disk surface, which means an entire file is typically located on a single drive. In contrast, when data is written to a RAID array, each file is split into multiple fragments. These fragments are then distributed and written in sequence across all the drives in the array. Depending on the configuration, fragment sizes can range from 2 KB to 2 MB, so every file is physically stored across several disks at once.

This approach significantly increases read and write performance — after all, writing two halves of a 1 GB file to two drives simultaneously is much faster than writing the full 1 GB to a single disk. However, this same mechanism makes file recovery far more complex.

Different RAID levels use different methods to distribute and protect data. On top of that, manufacturers like Synology often add their own proprietary structures and variations. As a result, data can be written to disks in many different formats, and each requires a specific approach during recovery.

How can regular performance monitoring and optimization help in preventing data loss on NAS Synology ioSafe 1515+ devices?

Regular performance monitoring and optimization can help in preventing data loss on NAS Synology ioSafe 1515+ devices in the following ways:

1. Early detection of issues: Regular monitoring allows you to identify any performance issues or anomalies that may indicate potential problems with the device. By detecting these issues early on, you can take proactive steps to address them before they lead to data loss.
2. Maintaining optimal performance: Monitoring the performance of your NAS device helps ensure that it is operating at its peak efficiency. By optimizing settings, storage configurations, and network performance, you can reduce the risk of data loss due to system slowdowns, bottlenecks, or failures.
3. Monitoring storage health: Regularly monitoring the health of your storage drives is crucial for preventing data loss. By monitoring metrics such as SMART (Self-Monitoring, Analysis, and Reporting Technology) data, you can identify signs of drive degradation or potential failures. This allows you to replace failing drives before they lead to data loss.
4. RAID monitoring: If you have configured your ioSafe 1515+ device with RAID (Redundant Array of Independent Disks), monitoring the RAID array is essential. Regularly checking the status of the RAID array, including the integrity of the data and the synchronization of drives, helps identify any potential issues that could result in data loss.
5. Backup monitoring: It is important to monitor the status and effectiveness of your backup processes. Regularly verify that backups are running successfully, and periodically test the restoration process to ensure that your data can be recovered in case of a failure.
6. Firmware and software updates: Keeping your NAS device's firmware and software up to date is crucial for security and performance reasons. Regularly monitoring for updates and applying them in a timely manner helps ensure that your device is protected against known vulnerabilities and that it operates optimally.

By regularly monitoring and optimizing the performance of your NAS Synology ioSafe 1515+ device, you can minimize the risk of data loss and ensure the safety and integrity of your data.

How to Remove Hard Disks from Your NAS and Connect Them to a PC

Although the NAS ioSafe 1515+ can be accessed over the network, you still need to remove its hard disks and connect them directly to a Windows PC. Only then can the recovery software properly scan and analyze the drives. Follow these steps:

1. Power off the NAS and disconnect it from the power source.

   WARNING! Before removing any drives, carefully read the device manual. Improper actions may damage both the NAS enclosure and the hard disks in the RAID array.

2. Remove the hard disks one by one, gently sliding each drive out of its slot. Remember that hard disks are highly sensitive: any impact or drop can cause serious physical damage.

3. Label each hard disk according to its position inside the NAS. The order of the drives is crucial for correct RAID reconstruction.

4. Connect the drives to your computer. In this video, we explain which ports you can use to connect hard disks and what to do if your PC does not have enough free connectors.

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   How to Order Remote Data Recovery

Step-by-Step Data Recovery with Hetman RAID Recovery

This program restores data from damaged RAID arrays and is fully compatible with Synology ioSafe 1515+. Each hard disk in the array contains technical metadata describing how files were written. When launched, Hetman RAID Recovery analyzes this metadata, automatically reconstructs the damaged array, and provides access to its contents. After that, you can browse the recovered disk and save your files. The program can also restore files that were accidentally deleted from the network drive.

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How to recover data from a Synology

ioSafe 1515+ has 5 HDD slots, and it supports the following array types:

• Synology Hybrid RAID (SHR);
• RAID 6;
• RAID 5;
• RAID 10;
• RAID 1;
• RAID 0;
• Basic;
• JBOD;

NAS supports:

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

How to Safely Recover Data from Disk Images

This utility allows you to create a complete copy of a disk and work with the disk image instead of the physical drive. This approach helps protect your data from:

• Overwriting during the recovery process;
• Additional data loss caused by bad sectors;
• User errors.

To create a disk image, follow these steps:

1. Ensure you have enough free space to store the image. Its size will typically match the size of the original disk.

2. In the main window, select the target disk and choose Tools - Save Disk. You can also select multiple disks if needed.

3. When the Image Creation Wizard opens, select whether you want to save the entire disk or only a specific region. Adjust the settings and click Next.

   

4. Choose the directory where the image will be saved. You may select any available disk connected to your PC or upload the image via FTP.

   

Where Are the User’s Files Actually Stored?

The Synology ioSafe 1515+ network-attached storage keeps DSM (DiskStation Manager) 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.

RAID Recovery Software: Detailed Comparison