What is SSH and how does it work?

SSH stands for Secure Shell, which is a cryptographic network protocol used for secure communication between two networked devices. It provides a secure channel over an unsecured network, such as the internet, to enable remote access and control of devices.SSH works by establishing a secure connection between a client and a server. The client initiates the connection by sending a request to the server, which responds by providing its public key. The client then verifies the server's authenticity using the public key.Once the server is authenticated, the client and server negotiate an encryption algorithm and a session key is generated. This session key is used to encrypt all subsequent data exchanged between the client and server.SSH also supports various authentication methods, such as password-based authentication or public key authentication. These methods ensure that only authorized users can access the server.Overall, SSH provides a secure and encrypted communication channel, protecting data and preventing unauthorized access during remote access sessions. It is widely used for secure remote administration of servers and for secure file transfers.

How does the NAS QNAP EJ1600 utilize SSH protocol for remote access and management?

The NAS QNAP EJ1600 utilizes the SSH (Secure Shell) protocol for remote access and management in the following ways:Secure Remote Access: SSH provides secure remote access to the QNAP NAS EJ1600. Users can remotely connect to the NAS using an SSH client, such as PuTTY, from any location with an internet connection.Encrypted Communication: SSH ensures that the communication between the remote client and the NAS is encrypted, preventing any unauthorized access or eavesdropping. This encryption protects sensitive data and credentials transmitted over the network.Command-Line Interface (CLI): SSH allows users to access the NAS's command-line interface remotely. This provides advanced users or system administrators with direct access to the NAS's operating system, enabling them to execute various commands for configuration, troubleshooting, or system management purposes.Secure File Transfer: SSH also facilitates secure file transfer between the remote client and the NAS. Users can securely transfer files to and from the NAS using SSH's built-in file transfer capabilities, such as SCP (Secure Copy) or SFTP (SSH File Transfer Protocol).Remote Management: Through SSH, users can remotely manage various aspects of the NAS, including system settings, user accounts, network configurations, and services. This allows system administrators to perform management tasks without physically accessing the NAS.Overall, the NAS QNAP EJ1600 utilizes the SSH protocol to ensure secure and encrypted remote access, enabling users to manage and interact with the NAS remotely while maintaining data confidentiality and integrity.

What are the advantages and security features of using SSH for accessing and controlling the QNAP EJ1600 NAS device?

Using SSH for accessing and controlling the QNAP EJ1600 NAS device offers several advantages and security features:Secure Remote Access: SSH (Secure Shell) provides a secure encrypted connection between the client and the server, ensuring that data transmitted over the network is protected from eavesdropping and tampering.Authentication: SSH uses various authentication methods, including password-based authentication and public key authentication. This adds an extra layer of security by verifying the identity of the user before granting access to the NAS device.Encryption: SSH encrypts all data transmitted between the client and the server, including login credentials and commands. This prevents unauthorized access to sensitive information.Port Forwarding: SSH allows for port forwarding, which enables secure access to services running on the NAS device from remote locations. This feature eliminates the need to expose ports directly to the internet, reducing the risk of unauthorized access.Command Execution: SSH provides a secure command-line interface to control and manage the QNAP EJ1600 NAS device remotely. It allows administrators to execute various commands, perform system administration tasks, and troubleshoot issues without physically accessing the device.Secure File Transfer: SSH includes the ability to securely transfer files between the client and the server using the Secure File Transfer Protocol (SFTP). This ensures that files are transmitted securely and protected from interception.Two-Factor Authentication (2FA): QNAP NAS devices often support two-factor authentication for SSH access. This adds an extra layer of security by requiring users to provide a second form of authentication, such as a verification code from a mobile app, in addition to the password.Auditing and Logging: SSH provides detailed logging capabilities, allowing administrators to monitor and track all SSH sessions, including login attempts, commands executed, and file transfers. This helps in auditing and investigating any security incidents or suspicious activities.Overall, using SSH for accessing and controlling the QNAP EJ1600 NAS device enhances security, ensures secure remote management, and protects sensitive data during transmission.

RAID Array Recovery on NAS QNAP EJ1600 (RAID 5, 6, 0, 1, JBOD, etc): How to Recover When It Breaks Down

Name: How to recover data from a QNAP
Uploaded: 2024-05-28T18:19:54+03:00
Description: How to recover data from a QNAP

RAID Array Recovery on NAS QNAP EJ1600: How to Recover When It Breaks Down

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?

RAID Recovery™ 2.6

Recover data from damaged RAID arrays inaccessible from a computer.

Download

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 QNAP also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

How can the NAS QNAP EJ1600 device's CPU or processing power affect data transfer and potential loss?

The CPU or processing power of the NAS QNAP EJ1600 device can affect data transfer and potential loss in several ways:

Data transfer speed: The CPU plays a crucial role in handling data transfer requests and managing network traffic. A more powerful CPU can process these requests faster, resulting in higher data transfer speeds. Conversely, a slower CPU may cause delays in data transfer, especially when dealing with large files or multiple concurrent transfers.
RAID calculations: The NAS device uses RAID (Redundant Array of Independent Disks) technology to provide data redundancy and protection against disk failures. The CPU performs various calculations related to RAID, such as parity calculations for RAID 5 or RAID 6. A faster CPU can perform these calculations more efficiently, reducing the time required for RAID operations and improving overall data transfer performance.
Data integrity checks: The CPU is responsible for performing data integrity checks, such as checksum calculations or error correction codes (ECC). These checks ensure that data transferred to and from the NAS device remains intact and error-free. A more powerful CPU can handle these checks more quickly and accurately, reducing the chances of data corruption or loss during transfer.
Network protocol processing: The CPU also handles the processing of various network protocols, such as TCP/IP, SMB, NFS, or FTP. Efficient processing of these protocols is essential for smooth data transfer and optimal network performance. A faster CPU can handle protocol processing more efficiently, reducing latency and potential data loss during transfer.
Concurrent user access: The CPU's processing power determines the number of concurrent users or connections the NAS device can handle effectively. If the CPU is underpowered, it may struggle to handle multiple users accessing and transferring data simultaneously. This can lead to slower transfer speeds, increased latency, and potential data loss due to congestion or resource limitations.

In summary, a more powerful CPU in the NAS QNAP EJ1600 device can significantly improve data transfer speeds, reduce latency, enhance data integrity checks, and handle concurrent user access more efficiently. These factors collectively contribute to a lower risk of potential data loss during transfer.

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

Although NAS EJ1600 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:

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.
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.
Make sure to mark each hard disk in accordance with how they were installed inside the NAS.
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.

Go to view

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 QNAP EJ1600. 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.

Go to view

How to recover data from a QNAP

EJ1600 has 16 HDD slots, and it supports the following array types:

RAID 50;
RAID 60;
RAID 6;
RAID 5;
RAID 10;
RAID 0;
RAID 1;
JBOD;

NAS supports:

ZFS;
EXT4;
EXT3;
exFAT;
FAT32 (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:

Make sure that you have enough free space to save the image. The image file size usually equals the disk size.
Select the disk in the main window, and choose from the menu Tools – Save Disk. You can select multiple disks to be saved.
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.
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 QNAP EJ1600 network-attached storage keeps QTS (QuTS hero) 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