Best Practices for Recovering Data from NAS Promise UltraTrak RM15000 RAID Array Failures

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 Promise 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 data fragmentation impact data availability and potential loss on NAS Promise UltraTrak RM15000 devices?

Data fragmentation can have a significant impact on data availability and potential loss on NAS Promise UltraTrak RM15000 devices. Here are some ways data fragmentation can affect these devices:

1. Reduced Performance: Data fragmentation leads to scattered data blocks across the storage system, causing increased seek times and reduced read/write speeds. This can result in slower data access and overall degraded performance on the NAS device.
2. Increased Disk Wear: Fragmentation forces the hard disk drives (HDDs) to work harder to retrieve scattered data blocks, leading to increased disk activity and wear. This can potentially shorten the lifespan of the drives and increase the risk of data loss due to drive failures.
3. Higher Probability of Data Loss: Fragmented data is more susceptible to data loss or corruption. If a fragmented file is partially overwritten or damaged, it becomes much more difficult to recover the complete file. This can result in permanent data loss or require expensive and time-consuming data recovery processes.
4. Difficulty in Backup and Restore: Fragmented data can complicate backup and restore operations. Backing up fragmented data may take longer and require more storage space, while restoring fragmented data may be slower and more error-prone. This can impact data availability and recovery in case of system failures or accidental deletions.
5. Limited Storage Efficiency: Fragmentation reduces the effective storage capacity of the NAS device. As files are fragmented and scattered across the drives, it becomes challenging to utilize the available storage efficiently. This can lead to wasted disk space and the need for frequent disk optimizations or defragmentation processes.

To mitigate these impacts, it is important to regularly monitor and defragment the data on NAS Promise UltraTrak RM15000 devices. Performing routine disk defragmentation and implementing strategies to prevent fragmentation can help maintain data availability, reduce the risk of data loss, and optimize the performance of the NAS device.

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

Although NAS UltraTrak RM15000 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 Promise UltraTrak RM15000. 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 Promise

UltraTrak RM15000 has 15 HDD slots, and it supports the following array types:

• RAID 0;
• RAID 1;
• RAID 1E;
• RAID 3;
• RAID 5;
• RAID 6;
• RAID 30;
• 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 Promise UltraTrak RM15000 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