RN104 raid volume recovery

Question

I understand this could be a duplicate post but I tried looking several other posts on Netgear community and could not find a solution so I am posting my problem here.

I had a NAS (RN104) with 4TB capacity (2x4TB) with x-raid configuration. I was assigned the task to increase the capacity with two more disks provided of 4TB. Accidently I messed up with raid configuration and lost the volume/raid configuration on those disks and have urgent requirement of restoring the raid md volumes and get the data back.

Current Status: When I boot the NAS with original disks, it gave error of "data degraded" on the screen. It looks like the definition of "data" volume also lost in the process.

I took out both the drives and connected to one of Linux (Fedora) system. I can see the software raid partition on that drive and md volume but inactive. Is there a way I can mount this volume on Linux and access my data from there. Attached are few outputs related to that. md125 (sda3) is the volume I guess which holds the data. Please help.

StephenB · Answer

Marc_V&nbsp;wrote:
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https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Mounting-ReadyNas-Duo-hardrive-in-Linux/td-p/1264837
https://ubuntuforums.org/showthread.php?t=2265348
&nbsp;

These won't work with an OS-6 NAS.
&nbsp;
Something like this should work:
# apt-get update# apt-get install mdadm btrfs-tools# mdadm --assemble --scan# cat /proc/mdstat# mount -t btrfs -o ro /dev/md127 /mnt
&nbsp;
Though if the system were shut down in the middle of converting RAID-1 to RAID-5 you likely will need data recovery (such as ReclaiMe).

varunmsh · Answer

Attached is the second screenshot for reference.

Marc_V · Answer

varunmsh

&nbsp;

Welcome to the Community!

&nbsp;

Did the expansion finished before this happened? it would be best if you can send us the full logs on a shared link. You can PM it to us.

&nbsp;

Regards

&nbsp;

varunmsh · Answer

Hello Marc,Thanks for looking into this. Unfortunately logs are not available now. There was a requirement of shares availability and someone reset the whole NAS device and rebuild the OS on new drives.However when I had discussed with the person who was working on it and I am completely sure that expansion was not completed. When the new drives were added, it started re-sync process which was interrupted and never completed. I recently discovered that someone disabled the x-raid also (hoping to create a new volume on new added drives) and since then it has this issues.Right now I have those two drives with me which were in x-raid (raid1) configuration earlier. I am hoping that I could mount the md raid volume in Linux and access the data from there.I can provide more outputs from that drive if that helps. Sorry I have only limited data to provide here.&nbsp;Thanks,Varun

Marc_V · Answer

varunmsh

So your previously RAID1 was expanded to RAID5 but did not complete right? since Flex-RAID was used and it was manually added. Then there was a reset if I understand correctly.

&nbsp;

If you have a Windows PC trying out ReCLAIMe to access the data would be suggested. If you are using Linux then you should be able to mount the RAID using CLI.

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Here are some Community post that might help

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https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Mounting-ReadyNas-Duo-hardrive-in-Linux/td-p/1264837

https://ubuntuforums.org/showthread.php?t=2265348

https://unix.stackexchange.com/questions/300122/mount-a-single-hard-disk-that-was-part-of-raid-1

&nbsp;

DDRescue might also be of use. Haven't use much of Linux to be honest but I'm sure other members will be able to help as well.

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Hope this helps!

&nbsp;

Regards

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RN104 raid volume recovery

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