Forum Discussion

Aspirant

Oct 15, 2015

Emergency - OS 6.4.0 - All my data is gone! Cannot reboot.

Hi, My readynas updated just over a week ago to 6.4.0. Since then it has been a little unstable, but I was able to reboot when it became unresponsive. Today I couldn't access the admin page, or ...

Feature Request & Feedback

jameswalmsley1

Aspirant

Oct 15, 2015

md: md127 stopped.
md: bind<sdb3>
md: bind<sda3>
md/raid1:md127: not clean -- starting background reconstruction
md/raid1:md127: active with 2 out of 2 mirrors
md127: detected capacity change from 0 to 5996206882816
md: resync of RAID array md127
md: minimum _guaranteed_ speed: 30000 KB/sec/disk.
md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for resync.
md: using 128k window, over a total of 5855670784k.

jameswalmsley1
Aspirant
Oct 17, 2015
What I found in the end was that my btrfs volume takes a really long time to mount on every reboot.
To recover, (because I had a raid1 setup) I was able to remove 1 drive and use a linux box to mount the disk:

mdadm --verbose --assemble /dev/md127 /dev/sdb3 --run

The --run is required to mount a raid1 without all disks available.

I then was able to mount the btrfs disk, but I had to use special options, otherwise the mount process would take > 24 hours.

mount -t btrfs -o ro,recovery /dev/md127 /mnt

From there I did a factory reset on my readynas and am now able to rsync my old data from /mnt to my NAS box.

This problem can occur if the device gets powered off while the btrfs disk is being updated.
- BrianL2
  NETGEAR Employee Retired
  Oct 27, 2015
  Hi jameswalmsey1,
  
  It seems that you're able to fix the problem with your ReadyNAS and the data is currently being copied through RSYNC.
  
  Let us know if you have other questions or in need of assistance.
  
  Kind regards,
  
  BrianL
  NETGEAR Community Team