This will allow you to access the machine remotely and check on the progress! Furthermore, this will also allow you to perform the recovery remotely. Top tip! Don’t have access to the machine all the time? You may want to consider installing openssh-server. Lastly, we installed and used a powerful tool known as MDADM to assemble the array from the images. The more technical are probably thinking here “How could you if the RAID array isn’t available?”.
A very powerful data copying tool that copies at the block level.įrom there, we booted into an Ubuntu 16.04 live CD in order to perform some scans for the file system. The best tool for us to use in this case was ddrescue. This is to ensure we have a copy of the data, should the worst case scenario happen and the drives fail completely. Next up, we created an image of each drive before continuing our work. This can cause the drive to fail completely and make recovery almost impossible! Quick note: When scanning the drives that are potentially failing, do not perform a read/write scan. That way, we can get an idea if there’s an offending drive, or if it was simply a software fault (considering this was a software RAID). Next, we carefully error scanned each hard drive to look for weak sectors/errors/bad blocks. We’ll be diving into the nitty gritty soon enough.įirstly, we pulled all 4 drives out of the NAS and carefully labelled each one to correspond with the slot they were in. That way, you can get an idea of the steps we took to recover the data off this array. So, I think this time we’ll start off with the overview of what we did. Never run into the situation below with a planned, monitored and maintained backup service! Call 01865 717088 for a quick quote and pricing. We also provide a flexible backup service for all.
It’s going to get technical, but extremely interesting.Ī quite note. So, how are we going to be able to do any data recovery on this? But on top of that, we have no way to access the current array from the NAS whatsoever. As you probably noticed with the title, this was a software based RAID5 array, as opposed to hardware based. No real technical info presented or error codes to work from.
Now, the user interface (UI) that comes with the Netgear NAS was showing that the RAID had failed. The customer came to us with a Netgear NAS (Network Attached Storage) with 4 HDDs (Hard Disk Drives) configured in RAID5 (Redundant Array of Inexpensive Disks). At Computer Assistance, we’re pretty comfortable with more advanced data recovery methods and approaches, however this one was something else. His week, a rather interesting issue was presented to us. A Tech Adventure: Data Recovery of Software RAID5 with BTRFS
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