NAS Huawei OceanStor 5800 Faulty RAID Array Recovery: Essential Tips

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?
  • Restoring data with Hetman RAID Recovery
  • Safe recovery from disk images
  • Where are user’s files stored?
  • Comparison of software for RAID recovery

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 Huawei 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 number of concurrent users or clients accessing a NAS Huawei OceanStor 5800 device affect data loss risks?

The number of concurrent users or clients accessing a NAS Huawei OceanStor 5800 device can affect data loss risks in the following ways:

1. Increased risk of data corruption: When multiple users or clients access the NAS device simultaneously, there is a higher chance of data corruption. If multiple users try to modify the same file or folder at the same time, conflicts can occur, leading to data loss or corruption.
2. Network congestion: The increased number of concurrent users can put a strain on the network infrastructure, leading to network congestion. Network congestion can result in data packets being dropped or delayed, which can cause data loss or inconsistency.
3. Performance degradation: With a large number of concurrent users, the NAS device's performance can degrade. This can lead to slower response times and increased latency, which can increase the risk of data loss. If the device becomes overloaded, it may fail to handle requests properly, resulting in data loss or corruption.
4. Security vulnerabilities: More concurrent users mean a larger attack surface for potential security breaches. If the NAS device is not properly secured or if user access controls are not implemented correctly, unauthorized users may gain access and compromise the data, leading to data loss.
5. Backup and recovery challenges: With a higher number of concurrent users, backup and recovery processes become more complex. It may be challenging to schedule regular backups without impacting user access. In case of data loss, the recovery process may take longer due to the increased number of files and users involved.

To mitigate these risks, it is essential to implement proper access controls, user permissions, and network infrastructure to handle the expected number of concurrent users. Regular backups should also be performed to ensure data can be recovered in case of any loss or corruption. Additionally, monitoring the performance of the NAS device and upgrading hardware or capacity as needed can help maintain optimal performance and minimize data loss risks.

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

Although NAS OceanStor 5800 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:

1. 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.

2. 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.

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

4. 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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   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 Huawei OceanStor 5800. 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.

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How to recover data from a Huawei

OceanStor 5800 has 2400 HDD slots, and it supports the following array types:

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

NAS supports:

• exFAT, VFAT, FAT 12 / 16 / 32;
• NTFS / ReFS;
• APFS / HFS+;
• Ext2 / 3 / 4 / ReiserFS / XFS / UFS / ZFS / Btrfs;
• VMFS / HikvisionFS;

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:

1. Make sure that you have enough free space to save the image. The image file size usually equals the disk size.

2. Select the disk in the main window, and choose from the menu Tools – Save Disk. You can select multiple disks to be saved.

3. 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.

   

4. 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 Huawei OceanStor 5800 network-attached storage keeps OS Linux 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