RN104 Remove inactive volumes to use the disk. Disk #1,2,3,4 after balance

Your best option is to contact paid Netgear support via my.netgear.com.

Hi again ronaldo864 

Thanks for sending over the logs. Here are my thoughts on this.

Firstly, your raid and your disks are all OK. So, the issue is not on the hardware side of things. The reason your are getting the error is because your data volume cannot mount. After your raid starts, the filesystem (BTRFS) cannot be mounted as it is damaged. Seen in the kernel logs:

Mar 25 10:56:34 kernel: BTRFS: device label 0e3565da:data devid 1 transid 584789 /dev/md127
Mar 25 10:56:35 kernel: BTRFS info (device md127): setting nodatasum
Mar 25 10:56:35 kernel: BTRFS info (device md127): has skinny extents
Mar 25 10:56:35 kernel: BTRFS critical (device md127): unable to find logical 285914365952 len 4096
Mar 25 10:56:35 kernel: BTRFS critical (device md127): unable to find logical 285914365952 len 4096
Mar 25 10:56:35 kernel: BTRFS critical (device md127): unable to find logical 285914365952 len 4096
Mar 25 10:56:35 kernel: BTRFS critical (device md127): unable to find logical 285914365952 len 4096
Mar 25 10:56:35 kernel: BTRFS critical (device md127): unable to find logical 285914365952 len 4096
Mar 25 10:56:35 kernel: BTRFS critical (device md127): unable to find logical 285914365952 len 4096
Mar 25 10:56:35 kernel: BTRFS error (device md127): failed to read chunk root
Mar 25 10:56:35 kernel: BTRFS error (device md127): open_ctree failed

The good news is that the NAS can see attributes of the file system so it is not entirely unreadable. I suspect corruption to the filesystem is quite "light" here. There are ways to recover from this and I think your NAS has quite good chances of recovery. BTRFS has some excellent built-in tool for this sort of situation - however, unless you are very familiar with Linux I suggest that you reach out to NETGEAR and ask their assistance in recovering from this.

It is gonna cost you a coupled hundred bucks for the data recovery contract and will be "best effort" but if you have no backup, it is certainly worth doing.

Cheers