Hi all
I have a ReadyNAS device with 4 4TB disks. It was working all right
for couple of years. At one point the system became read-only, and
after reboot data is inaccessible.
Can anyone give some advise how to recover data from the file system?
system details are
root@Dyskietka:~# uname -a
Linux Dyskietka 4.4.116.armada.1 #1 SMP Mon Feb 19 22:05:00 PST 2018
armv7l GNU/Linux
root@Dyskietka:~# btrfs --version
btrfs-progs v4.12
root@Dyskietka:~# btrfs fi show
Label: '2fe4f8e6:data' uuid: 0970e8c4-fd47-43d3-aa93-593006e3d0c3
Total devices 1 FS bytes used 8.11TiB
devid 1 size 10.90TiB used 8.11TiB path /dev/md127
root@Dyskietka:~# btrfs fi df /dev/md127
ERROR: not a btrfs filesystem: /dev/md127
dmesg
[Sat Jun 1 13:18:48 2019] md/raid:md1: device sdc2 operational as raid disk 0
[Sat Jun 1 13:18:48 2019] md/raid:md1: device sda2 operational as raid disk 3
[Sat Jun 1 13:18:48 2019] md/raid:md1: device sdb2 operational as raid disk 2
[Sat Jun 1 13:18:48 2019] md/raid:md1: device sdd2 operational as raid disk 1
[Sat Jun 1 13:18:48 2019] md/raid:md1: allocated 4294kB
[Sat Jun 1 13:18:48 2019] md/raid:md1: raid level 6 active with 4 out
of 4 devices, algorithm 2
[Sat Jun 1 13:18:48 2019] RAID conf printout:
[Sat Jun 1 13:18:48 2019] --- level:6 rd:4 wd:4
[Sat Jun 1 13:18:48 2019] disk 0, o:1, dev:sdc2
[Sat Jun 1 13:18:48 2019] disk 1, o:1, dev:sdd2
[Sat Jun 1 13:18:48 2019] disk 2, o:1, dev:sdb2
[Sat Jun 1 13:18:48 2019] disk 3, o:1, dev:sda2
[Sat Jun 1 13:18:48 2019] md1: detected capacity change from 0 to 1071644672
[Sat Jun 1 13:18:49 2019] EXT4-fs (md0): mounted filesystem with
ordered data mode. Opts: (null)
[Sat Jun 1 13:18:49 2019] systemd[1]: Failed to insert module
'kdbus': Function not implemented
[Sat Jun 1 13:18:49 2019] systemd[1]: systemd 230 running in system
mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
+LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS
+KMOD +IDN)
[Sat Jun 1 13:18:49 2019] systemd[1]: Detected architecture arm.
[Sat Jun 1 13:18:49 2019] systemd[1]: Set hostname to <Dyskietka>.
[Sat Jun 1 13:18:50 2019] systemd[1]: Started Dispatch Password
Requests to Console Directory Watch.
[Sat Jun 1 13:18:50 2019] systemd[1]: Listening on /dev/initctl
Compatibility Named Pipe.
[Sat Jun 1 13:18:50 2019] systemd[1]: Listening on Journal Socket (/dev/log).
[Sat Jun 1 13:18:50 2019] systemd[1]: Listening on udev Kernel Socket.
[Sat Jun 1 13:18:50 2019] systemd[1]: Created slice System Slice.
[Sat Jun 1 13:18:50 2019] systemd[1]: Created slice
system-serial\x2dgetty.slice.
[Sat Jun 1 13:18:50 2019] systemd[1]: Reached target Encrypted Volumes.
[Sat Jun 1 13:18:50 2019] systemd[1]: Started Forward Password
Requests to Wall Directory Watch.
[Sat Jun 1 13:18:50 2019] systemd[1]: Listening on Journal Socket.
[Sat Jun 1 13:18:50 2019] systemd[1]: Started ReadyNAS LCD splasher.
[Sat Jun 1 13:18:50 2019] systemd[1]: Starting ReadyNASOS system prep...
[Sat Jun 1 13:18:50 2019] systemd[1]: Mounting RPC Pipe File System...
[Sat Jun 1 13:18:50 2019] systemd[1]: Starting Remount Root and
Kernel File Systems...
[Sat Jun 1 13:18:50 2019] systemd[1]: Starting Create list of
required static device nodes for the current kernel...
[Sat Jun 1 13:18:50 2019] systemd[1]: Mounting POSIX Message Queue
File System...
[Sat Jun 1 13:18:50 2019] systemd[1]: Created slice User and Session Slice.
[Sat Jun 1 13:18:50 2019] systemd[1]: Reached target Slices.
[Sat Jun 1 13:18:50 2019] systemd[1]: Created slice system-getty.slice.
[Sat Jun 1 13:18:50 2019] systemd[1]: Starting Load Kernel Modules...
[Sat Jun 1 13:18:50 2019] systemd[1]: Mounting RPC Pipe File System...
[Sat Jun 1 13:18:50 2019] systemd[1]: Starting Journal Service...
[Sat Jun 1 13:18:50 2019] systemd[1]: Listening on udev Control Socket.
[Sat Jun 1 13:18:50 2019] systemd[1]: Reached target Paths.
[Sat Jun 1 13:18:51 2019] systemd[1]: Mounted RPC Pipe File System.
[Sat Jun 1 13:18:51 2019] systemd[1]: Mounted RPC Pipe File System.
[Sat Jun 1 13:18:51 2019] systemd[1]: Mounted POSIX Message Queue File System.
[Sat Jun 1 13:18:51 2019] systemd[1]: Started ReadyNASOS system prep.
[Sat Jun 1 13:18:51 2019] systemd[1]: Started Remount Root and Kernel
File Systems.
[Sat Jun 1 13:18:51 2019] systemd[1]: Started Create list of required
static device nodes for the current kernel.
[Sat Jun 1 13:18:51 2019] systemd[1]: Started Load Kernel Modules.
[Sat Jun 1 13:18:51 2019] systemd[1]: Starting Apply Kernel Variables...
[Sat Jun 1 13:18:51 2019] systemd[1]: Mounting FUSE Control File System...
[Sat Jun 1 13:18:51 2019] systemd[1]: Mounting Configuration File System...
[Sat Jun 1 13:18:51 2019] systemd[1]: Starting Create Static Device
Nodes in /dev...
[Sat Jun 1 13:18:51 2019] systemd[1]: Starting Load/Save Random Seed...
[Sat Jun 1 13:18:51 2019] systemd[1]: Starting Rebuild Hardware Database...
[Sat Jun 1 13:18:51 2019] systemd[1]: Mounted Configuration File System.
[Sat Jun 1 13:18:51 2019] systemd[1]: Mounted FUSE Control File System.
[Sat Jun 1 13:18:51 2019] systemd[1]: Started Apply Kernel Variables.
[Sat Jun 1 13:18:51 2019] systemd[1]: Started Load/Save Random Seed.
[Sat Jun 1 13:18:51 2019] systemd[1]: Started Create Static Device
Nodes in /dev.
[Sat Jun 1 13:18:51 2019] systemd[1]: Starting udev Kernel Device Manager...
[Sat Jun 1 13:18:51 2019] systemd[1]: Started udev Kernel Device Manager.
[Sat Jun 1 13:18:51 2019] systemd[1]: Starting MD arrays...
[Sat Jun 1 13:18:51 2019] systemd[1]: Started Journal Service.
[Sat Jun 1 13:18:51 2019] systemd-journald[1058]: Received request to
flush runtime journal from PID 1
[Sat Jun 1 13:18:52 2019] md: md127 stopped.
[Sat Jun 1 13:18:52 2019] md: bind<sdd3>
[Sat Jun 1 13:18:52 2019] md: bind<sdb3>
[Sat Jun 1 13:18:52 2019] md: bind<sda3>
[Sat Jun 1 13:18:52 2019] md: bind<sdc3>
[Sat Jun 1 13:18:52 2019] md/raid:md127: device sdc3 operational as raid disk 0
[Sat Jun 1 13:18:52 2019] md/raid:md127: device sda3 operational as raid disk 3
[Sat Jun 1 13:18:52 2019] md/raid:md127: device sdb3 operational as raid disk 2
[Sat Jun 1 13:18:52 2019] md/raid:md127: device sdd3 operational as raid disk 1
[Sat Jun 1 13:18:52 2019] md/raid:md127: allocated 4294kB
[Sat Jun 1 13:18:52 2019] md/raid:md127: raid level 5 active with 4
out of 4 devices, algorithm 2
[Sat Jun 1 13:18:52 2019] RAID conf printout:
[Sat Jun 1 13:18:52 2019] --- level:5 rd:4 wd:4
[Sat Jun 1 13:18:52 2019] disk 0, o:1, dev:sdc3
[Sat Jun 1 13:18:52 2019] disk 1, o:1, dev:sdd3
[Sat Jun 1 13:18:52 2019] disk 2, o:1, dev:sdb3
[Sat Jun 1 13:18:52 2019] disk 3, o:1, dev:sda3
[Sat Jun 1 13:18:52 2019] md127: detected capacity change from 0 to
11987456360448
[Sat Jun 1 13:18:53 2019] Adding 1046524k swap on /dev/md1.
Priority:-1 extents:1 across:1046524k
[Sat Jun 1 13:18:53 2019] BTRFS: device label 2fe4f8e6:data devid 1
transid 155439 /dev/md127
[Sat Jun 1 13:18:53 2019] BTRFS info (device md127): setting nodatasum
[Sat Jun 1 13:18:54 2019] BTRFS critical (device md127): unable to
find logical 62139990016 len 4096
[Sat Jun 1 13:18:54 2019] BTRFS critical (device md127): unable to
find logical 62139990016 len 4096
[Sat Jun 1 13:18:54 2019] BTRFS critical (device md127): unable to
find logical 62139990016 len 4096
[Sat Jun 1 13:18:54 2019] BTRFS critical (device md127): unable to
find logical 62139990016 len 4096
[Sat Jun 1 13:18:54 2019] BTRFS critical (device md127): unable to
find logical 62139990016 len 4096
[Sat Jun 1 13:18:54 2019] BTRFS critical (device md127): unable to
find logical 62139990016 len 4096
[Sat Jun 1 13:18:54 2019] BTRFS error (device md127): failed to read chunk root
[Sat Jun 1 13:18:54 2019] BTRFS error (device md127): open_ctree failed
--
regards
Robert
