As long as you are the original purchaser and have registered the NAS with Netgear, they will support it. Not for free, of course. Recovery isn't covered by warranty, anyway.
The pay-per-incident support and data recovery contract purchase should still be available for your device. You can purchase the support contract by logging in to my.netgear.com. You can also open a support ticket there.
I have paid £80 for 3 year support ( per case support was not available for my NAS) Spent 45 minutes on call and been told that I need to buy data recovery from Netgear for £160/ hour. ( My support contract can be credited towards recoery).
So no guarantee that my data recovery will not extend for another few hours.
I can easily telnet on the NAS in the Tech support mode, I am seriously considering trying it by myself though it might cost some time.
I tried to build the RAID by running start_raid.sh, but it looks like this script is not found .
I do not have experience in btrfs recovery , I am aware it might cost me data though willing to try , if worse come to worse I will have to revert to backup and loose 2 weeks ( already started recreating lost data from othe rsources). Can you help with further steps for btrfs recovery?
It is good starting point i will do some reading, just to make my work easier: how to gracefully shutdown NAS in tech support mode, shall I run something to stop RAID, I guess I just exit from chroot. How to shutdown NAS then, shutdown command does not work?
Try rn_shutdown. That's an r & n (for ReadyNAS), not an m before the underscore. That's the command for standard SSH, I have never tried it in tech support mode. It's located in /usr/bin.
Now I started and not sure why my nas is md126, see attached screenshot.
Unfortunatelly btrfs commands do not work on md127, md126 checksum incorrect.
Can you say if md126 is an sensible raid alias or i need to rearange something?
Your NAS was vertically expanded (disks 1 and 3 appear to be larger), so you have two RAID groups. Normally md127 would be the original group. But in your case that appears to be md126.
Have you given up on Netgear tech support? They should have gotten back to you by now.
root@3EPB43EE0025E:/# btrfs check --repair /dev/md126 enabling repair mode checksum verify failed on 9150299111424 found 10BC57A5 wanted 18B79090 checksum verify failed on 9150299111424 found 10BC57A5 wanted 18B79090 parent transid verify failed on 9150299111424 wanted 88714 found 86890 checksum verify failed on 9150299111424 found 10BC57A5 wanted 18B79090 Csum didn't match ERROR: cannot open file system
I know you not an expert on btrfs, though any suggestion might put me in right direction.
On netgear tech support
They contacted me origianly, spent 45 minutes on the NAS and decided I need to pay ~£160/hour for data recovery - of course no guarantee.
I am afraid they either want more hours, or recover partial data which does not contain what I have really lost. I accept I will loose 2 weeks of family pictures, so be it.
On shutdown
In chroot I can see both files
/sbin/shutdown
/usr/bin/rn_shutdown
issuing rn_shutdown: causes some noise from disks and nothing happends,
issuing shutdown: "Running in chroot, ignoring request"
After typing "exit", rn_shutdown, shutdown are no longer present.
If I run new telent also rn_shutdown, shutdown are not present unless I enter chroot
