- 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?
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 Synology 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 the use of specific data synchronization or replication mechanisms mitigate data loss risks for NAS Synology RackStation RS2818RP+ devices?
Yes, the use of specific data synchronization or replication mechanisms can help mitigate data loss risks for NAS Synology RackStation RS2818RP+ devices.
Synology offers various data protection and backup features that can be utilized to ensure data availability and minimize the risk of data loss. Some of these mechanisms include:
- RAID (Redundant Array of Independent Disks): The RS2818RP+ supports various RAID configurations, such as RAID 1, RAID 5, RAID 6, and RAID 10. RAID provides redundancy by distributing data across multiple disks, ensuring that even if one disk fails, the data remains accessible.
- Snapshot Replication: This feature allows you to take point-in-time snapshots of your data and replicate them to another Synology NAS or an off-site location. In case of accidental file deletion, data corruption, or ransomware attacks, you can restore the data from a previous snapshot.
- High Availability (HA): By configuring two RS2818RP+ devices in an HA cluster, you can ensure continuous service availability. In the event of a hardware failure, the secondary device takes over seamlessly, minimizing downtime and data loss.
- Hyper Backup: This backup solution allows you to create scheduled backups of your data to various destinations, including local shared folders, external drives, remote Synology NAS, or cloud storage services. It provides versioning and incremental backups, reducing the risk of data loss.
- Cloud Sync: With Cloud Sync, you can synchronize your data between your RS2818RP+ and popular cloud storage providers like Dropbox, Google Drive, or Amazon S3. This ensures an additional copy of your data is stored off-site, protecting against local disasters.
By implementing a combination of these data synchronization and replication mechanisms, you can significantly mitigate the risk of data loss for your NAS Synology RackStation RS2818RP+ devices.
How to take hard disks out of the NAS and connect them to a PC?
Although NAS RackStation RS2818RP+ 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:
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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.
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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.
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Make sure to mark each hard disk in accordance with how they were installed inside the NAS.
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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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Restoring data with Hetman RAID Recovery
This program recovers data from damaged RAID arrays and is fully compatible with Synology RackStation RS2818RP+. 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.
RackStation RS2818RP+ has 16 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);
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:
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Make sure that you have enough free space to save the image. The image file size usually equals the disk size.
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Select the disk in the main window, and choose from the menu Tools – Save Disk. You can select multiple disks to be saved.
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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.
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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 Synology RackStation RS2818RP+ 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.
Comparison of software for RAID recovery
Product | Operating system | License type | RAID controller support | Supported file systems | Virtual RAID controller support | Data recovery from damaged RAID | File preview |
---|---|---|---|---|---|---|---|
Hetman RAID Recovery | Windows | Paid | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
DiskInternals RAID Recovery | Windows | Paid | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | No | Yes | Yes |
R-Studio | Windows, Mac, Linux | Paid | Yes, over 200 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
UFS Explorer RAID Recovery | Windows, Mac, Linux | Paid | Yes, over 1,000 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
EaseUS Data Recovery | Windows | Paid | Yes, over 20 controllers | FAT, NTFS, Ext2/3/4, HFS+ | No | Yes | Yes |
ReclaiMe Free RAID Recovery | Windows | Free | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |