No volume exists

Yesterday in the morning NAS started to behave extremely slow. Found out it was stuck in a rsync process for days (replication to another NAS), but I was unable to stop the process. So NAS was restarted. RSync was not working anymore, but wotking with it was still a nightmare.

Since it was begging for update for a few weeks already, I updated it to 6.9.5. After reboot everything went to normal - except speed. But I left it alone.

But today in the morning all the shares disappeared... Web interface announced

- No volume exists. Netgear recommends that you create a volume before configuring other settings.

- Remove inactive volumes to use disk #1,2,3,4,1,2,3,4.

- Volume is inactive or dead

 

 

Upgraded to 6.10.0 (RC1), multiple reboots, no change. Configuration : 4 x 6 TB HDD

 

dmesg output :

[ 72.906823] systemd[1]: Starting MD arrays...
[ 73.232007] md: md127 stopped.
[ 73.270323] md: bind<sdd3>
[ 73.284432] md: bind<sdb3>
[ 73.287420] md: bind<sda3>
[ 73.288151] md: bind<sdc3>
[ 73.298544] md/raid:md127: device sdc3 operational as raid disk 0
[ 73.298566] md/raid:md127: device sda3 operational as raid disk 3
[ 73.298575] md/raid:md127: device sdb3 operational as raid disk 2
[ 73.298583] md/raid:md127: device sdd3 operational as raid disk 1
[ 73.302839] md/raid:md127: allocated 4294kB
[ 73.314299] md/raid:md127: raid level 5 active with 4 out of 4 devices, algorithm 2
[ 73.314317] RAID conf printout:
[ 73.314325] --- level:5 rd:4 wd:4
[ 73.314334] disk 0, o:1, dev:sdc3
[ 73.314342] disk 1, o:1, dev:sdd3
[ 73.314349] disk 2, o:1, dev:sdb3
[ 73.314357] disk 3, o:1, dev:sda3
[ 73.314830] md127: detected capacity change from 0 to 11987456360448
[ 73.408064] systemd[1]: Started Journal Service.
[ 73.648881] BTRFS: device label 0e352432:data devid 1 transid 1251517 /dev/md127
[ 73.649826] systemd-journald[1086]: Received request to flush runtime journal from PID 1
[ 73.696635] Adding 1046524k swap on /dev/md1. Priority:-1 extents:1 across:1046524k
[ 73.955192] md: md126 stopped.
[ 73.966942] md: bind<sda4>
[ 73.967525] md: bind<sdd4>
[ 73.968059] md: bind<sdc4>
[ 73.968620] md: bind<sdb4>
[ 73.983011] md/raid:md126: device sdb4 operational as raid disk 0
[ 73.983032] md/raid:md126: device sdc4 operational as raid disk 3
[ 73.983041] md/raid:md126: device sdd4 operational as raid disk 2
[ 73.983050] md/raid:md126: device sda4 operational as raid disk 1
[ 73.984769] md/raid:md126: allocated 4294kB
[ 73.984959] md/raid:md126: raid level 5 active with 4 out of 4 devices, algorithm 2
[ 73.984970] RAID conf printout:
[ 73.984977] --- level:5 rd:4 wd:4
[ 73.984985] disk 0, o:1, dev:sdb4
[ 73.984993] disk 1, o:1, dev:sda4
[ 73.985000] disk 2, o:1, dev:sdd4
[ 73.985008] disk 3, o:1, dev:sdc4
[ 73.989401] md126: detected capacity change from 0 to 6000767729664
[ 74.336354] BTRFS: device label 0e352432:data devid 2 transid 1251517 /dev/md126
[ 74.824574] BTRFS info (device md126): setting nodatasum
[ 75.604171] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.604200] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624049] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624076] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624162] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624176] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624214] BTRFS warning (device md126): failed to read tree root
[ 75.624249] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624262] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624310] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624324] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624369] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624383] BTRFS critical (device md126): unable to find logical 9046860824576 len 4096
[ 75.624416] BTRFS warning (device md126): failed to read tree root
[ 75.624490] BTRFS critical (device md126): unable to find logical 9046856433664 len 4096
[ 75.624502] BTRFS critical (device md126): unable to find logical 9046856433664 len 4096
[ 75.624554] BTRFS critical (device md126): unable to find logical 9046856433664 len 4096
[ 75.624567] BTRFS critical (device md126): unable to find logical 9046856433664 len 4096
[ 75.624614] BTRFS critical (device md126): unable to find logical 9046856433664 len 4096
[ 75.624626] BTRFS critical (device md126): unable to find logical 9046856433664 len 4096
[ 75.624661] BTRFS warning (device md126): failed to read tree root
[ 75.624718] BTRFS critical (device md126): unable to find logical 9046852075520 len 4096
[ 75.624731] BTRFS critical (device md126): unable to find logical 9046852075520 len 4096
[ 75.624779] BTRFS critical (device md126): unable to find logical 9046852075520 len 4096
[ 75.624792] BTRFS critical (device md126): unable to find logical 9046852075520 len 4096
[ 75.624839] BTRFS critical (device md126): unable to find logical 9046852075520 len 4096
[ 75.624852] BTRFS critical (device md126): unable to find logical 9046852075520 len 4096
[ 75.624886] BTRFS warning (device md126): failed to read tree root
[ 75.624937] BTRFS critical (device md126): unable to find logical 9046846832640 len 4096
[ 75.624950] BTRFS critical (device md126): unable to find logical 9046846832640 len 4096
[ 75.625001] BTRFS critical (device md126): unable to find logical 9046846832640 len 4096
[ 75.625013] BTRFS critical (device md126): unable to find logical 9046846832640 len 4096
[ 75.625060] BTRFS critical (device md126): unable to find logical 9046846832640 len 4096
[ 75.625072] BTRFS critical (device md126): unable to find logical 9046846832640 len 4096
[ 75.625106] BTRFS warning (device md126): failed to read tree root
[ 75.800322] BTRFS error (device md126): open_ctree failed

 

Any idea how to get data back ?