Pool turned read-only at 100% usage

@schoschi12 wrote:

Hi everyone

A few days ago I let the usage of a raid5 pool get up to 100%. This has also happened before and didn’t lead to any problem, this time however the pool went read-only, and I can’t get it to mount read-write.
I tried remounting the pool with sudo mount -o remount /dev/sda, but that does not seem to do anything.
I have tried extending the pool with usb drive, I tried changing the pool to “single” instead of raid5.
I have some device errors, which I don’t really know where they come from.
Is there a way to upload a *.txt file? I have the response to ‘btrfs check -force -p /dev/sda’ concluding with “ERROR: errors found in fs roots” and also for ‘dmesg’ which again is riddled with errors. If that or anything else helps locating the problem, please let me know. Any help is much appreciated.

Edit: I just got a little further. By adding the extra mount option “skip_balance”, the pool mounts as rw. I can also enter the file structure with “cd”, but as soon as I try to delete anything or even just list directories through “ls”, the pool switches to read-only again. Trying to add a disk (well, an 8GB USB drive) also switches the pool back to read-only.

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