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Forum Discussion
Readynas 204 - v6.9.2 - Read only
It seems my RN204 decided to put shares into Ready Only mode. How do I find out why, and how do I fix it? Found this in dmesg.log: [Tue Feb 20 16:58:20 2018] BTRFS error (device md127): paren...
Generally this is happening when the system decides that allowing writes to the volume will put data at risk. That suggests the the best fix is to destroy and recreate the volume, and then reload the data from backup.
You can download the log zip file, and look for clues.
You could attempt to repair the volume using btrfs shell commands (at your own risk). I strongly recommend ensuring you have a full backup before attempting that.
Thank you. Yeah, I'll make sure to have a backup before proceeding. I don't really understand from logs what has happened and why it puts mounts in read-only.
Usually it's because the system is seeing btrfs errors.
Update: I got an external drive and did a backup (via PC).
* There is some data corruption unfortunatelly.
* Also the snapshots on one of the two shares, unfortunatelly the important one, are borked. They are sort of listed but when I open one it just opens the list of snapshots again.
* There are inconsistencies in the web UI. It says system is healthy, it says 0 snapshots in one place but a lot of snapshots in other place.
* I suspect that things went bad when I deleted a iSCSI LUN, possibly specifically when volume was rebalanced. iSCSI in itself has caused me lot of pain and tears with ReadyNAS. :/ Not touching iSCSI on ReadyNAS again.
* Currently scrubbing to see if any luck with the corrupt data.
* I have no idea how to remove the read-only stuff and try btrfs repairs.
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