Click image to enlargeĪs it was said before in this article, the disks should be taken out of the NAS device and connected to a computer with installed R-Studio and data recovery should take place on that computer.ġ. Click image to enlargeĭue to this hardware failure the NAS share became inaccessible on the local network. status went red (a failure) and soon the disk stopped working at all. To make the situation much worse, one disk in the RAID5 failed. File system on the NAS device with the deleted SF folder. Then the SF folder containing jpg files was deleted. 2 shows the file system stored on this NAS device. Then some files were written to that share. Click image to enlargeĪn ext4fs volume based on this RAID5 was created and made accessible on a local network as the //NAS-TEST/NAS-test/ share. 1 shows the components of such a RAID5 created using the mdadm technology. This is a good trade-off between storage space and reliability.įig.
The most efficient way to utilize them is to create a RAID5. We used three 500 GB disks in this configuration. If the NAS volumes were reformatted, you can also use this article to re-create the RAIDs and then follow the instructions in our article Data Recovery from a Re-formatted ext4FS disk.Ī mdadm RAID-based NAS NAS configuration:
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In this article we'll use free OpenMediaVault as our test NAS because it can use the RAID and LVM2 technologies in the most transparent way. It may be an internal or external disk, or other storage device visible to the host computer, including connected network disks.
You'll also need a free disk space large enough to store recovered files. You may check this using disks S.M.A.R.T. The drawback of this approach is that such images may be quite large, and if disk space to store those images is a problem, you may recover data directly from the disks, provided that you're absolutely sure that the disks in the NAS device are healthy. Our articleĬlone Disks before File Recovery explains why. We also recommend you to save images of the disks, as data recovery professionals always do, and perform all file recovery from such images. R-Studio supports both of these technologies and can assemble such RAIDs automatically in most cases. Those systems create more user-friendly interfaces for disk management, whereas the underlying technology remains pure native Linux. All various proprietary RAID management systems are based on two Linux RAID technologies: mdadm and LVM2. Most NAS devices runs on a customized version of the Linux OS. That's why disks should be taken out from such devices and connected to a computer where R-Studio is installed. Therefore none of the available data recovery tools, R-Studio or R-Studio Agent included, can run directly on such devices. Most commercial NAS devices differ from regular PCs: quite often they use Intel-incompatible CPUs (usually PowerPC processors), they have no video output ports, and it's impossible to connect a keyboard and mouse to them. General notes on data recovery from NAS devices
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This article will show you how to use our data recovery program R-Studio to recover files from typical simple NAS configurations. Those systems allow home or small business users to efficiently utilize their spare hard drives, but they also come with one drawback: when it comes to data recovery, it's not clear how handle such RAID systems. Many NAS vendors offer their customers their proprietary RAID management systems that are able to combine different hard drives into quite complex RAID systems without much knowledge of RAID technology. Most NAS devices use RAIDs of various types for disk fault tolerance and data consistency. Compared to PC-based file servers, they are inexpensive, consume less electricity, and are easy to maintain even for a not so experienced person. NAS (Network Attached Storage) devices are becoming more and more popular both in home and small to medium size business environments.
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