ReadyNas 314 lost volume

Hi Matt-I 

Thanks for the logs.

The good news is that your data raid starts just fine and is running. The reason you are getting the cryptic message of: "Remove inactive volumes", is because the filesystem cannot mount. When the NAS boots up, we can see that the BTRFS filesystem fails do a log-replay as it cannot read the log-tree. Essentially, the log-tree has some sort of corruption. That log is the filesystem journal and because the filesystem has issues reading that log-tree, it just stops and refuses to mount. BTRFS is doing this for data integrity to prevent any further/actual data corruption due to a damaged journal.

[Sun Oct 31 19:29:16 2021] BTRFS info (device md127): start tree-log replay
[Sun Oct 31 19:29:16 2021] BTRFS error (device md127): parent transid verify failed on 9746886656 wanted 7573031 found 7532096
[Sun Oct 31 19:29:16 2021] BTRFS error (device md127): parent transid verify failed on 9746886656 wanted 7573031 found 7532096
[Sun Oct 31 19:29:16 2021] BTRFS warning (device md127): failed to read log tree
[Sun Oct 31 19:29:16 2021] BTRFS error (device md127): open_ctree failed

This is a good match running a zero-log against the filesystem. You can reset the journal which should allow the filesystem to mount again. This should solve your issue and is quite safe to run and especially given that you have most of the data backed up. I would suggest trying this.

Clearing the journal-log may lead to loss of changes that were made since the last transaction commit, but the risks should be fairly low here.

In order to do this, you need to access the NAS over SSH and login as the "root" user. Then run this command from the command line.

btrfs rescue zero-log /dev/md127

Hereafter, reboot the NAS from the Web admin page.

Instructions on how to access the NAS via SSH, are below.

1. Go to System > Settings > Services.
2. Click on SSH.
3. When prompted with the support warning, click Yes if you are sure you want to proceed.
4. Select Enable SSH and Enable password authentication.
5. Click Apply.
6. You can now connect to the ReadyNAS through SSH as the root user.

Note: The root password is the same as the admin password to the web admin page.

Now, open command prompt in Windows and type:

ssh root@192.168.0.1

---> Replace 192.168.0.1 with the actual IP of your NAS

Then, you will be presented with a prompt to whether you trust and want to connect to the NAS. Type "yes" and hit Enter.

This should take you to the login prompt to the NAS.
---> Username: root (and hit Enter)
---> Password: The root password is the same as the admin password to the web admin page (and hit Enter).

Once you are in, run the command from above

btrfs rescue zero-log /dev/md127

It can take up to 30 seconds to complete but once done, then you can exit the NAS command line. Type:

exit

Last step, go to the admin web page and reboot the NAS.

Let us know how you get on and if you have any questions.

Cheers