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BTRFS error ReadyNAS 314, OS6.10.8
I wonder whether anyone can help? 314, four Toshiba DT01ACA200 drives in X-RAID (I normally use Flex-RAID; I guess I just forgot to change over...), and working perfectly until recently. Now every ...
Sandshark wrote:
Since a drive error is one potential cause,
It's hard to rule disks out, as I have seen them mis-behave in ways that don't affect the smart stats.
mfb9: If you want me to take a look, then send me a link to dropbox (or google drive, icloud, onedrive, ...) via a private message (PM). Please provide the full zip file. You send a PM using the envelope icon in the upper right of the forum page. Make sure the permissions allow anyone with the link to download
The OS is putting the volume into read-only mode to prevent you from doing any more damage to the already unreliable volume. Take the hint and make sure everything is backed up before the volume becomes inaccessible.
I had a similar issue some years back, and nothing I did short of destroying and re-creating the volume had a lasting effect.
Thanks very much. Yes, everything is backed up regularly, but it's still a worry! So the "damage" is likely to be what exactly? The drives seem reliable on the testing that the system does (although I recognise that a more in-depth test on drives taken out and interrogated individually can sometimes show problems that aren't picked up by the ReadyNAS system). Is it a volume structure problem? Because I thought the whole point of using BTRFS and copy-on-write as "Bit Rot Protection" was that volume errors were self-healing in a sense.
So if I destroy and re-create the volumes and write back the backup that should do the job? Without hardware change?
Thanks very much for your help.
mfb9 wrote:
Yes, everything is backed up regularly, but it's still a worry! So the "damage" is likely to be what exactly?
General possibilities:
- Disk errors
- File system metadata (folder structures, etc) have somehow gotten corrupted
Metadata can become corrupted due to lost disk writes, Causes include
- system power-fail
- system crash
- ungraceful shutdown
Some form of "bit-rot" also (memory corruption, perhaps due a bug, etc)
Since a drive error is one potential cause, I can't guarantee that destroying and re-creating your volume will fully fix the issue. It would be good to check the drives out as well.
I actually had this happen twice, now that I think about it. One was on an EDA500 that had the eSATA cable come loose. I didn't even mess with it, as what was on it was easily recovered from my backup. The first time, it was because my UPS battery got too old and didn't hold the unit up during a brown-out. I was hoping to recover the volume to reduce my recovery work, so I tried a lot of stuff. Ultimately, I gave up and did the backup (which doesn't take long to update if you've been backing up all along), destroy, and re-creation. A complete factory default is an even "cleaner" way to accomplish it if you have just the one volume. If you have "dead" ReadyCloud users accounts, that would clear them, too. Include backing up the configuration to be restored later. But if you do have ReadyCloud users, maybe you should see if there seems to be anything in the backup that you don't want restored because it would restore the ReadyCloud accounts.
Sandshark wrote:
Since a drive error is one potential cause,
It's hard to rule disks out, as I have seen them mis-behave in ways that don't affect the smart stats.
mfb9: If you want me to take a look, then send me a link to dropbox (or google drive, icloud, onedrive, ...) via a private message (PM). Please provide the full zip file. You send a PM using the envelope icon in the upper right of the forum page. Make sure the permissions allow anyone with the link to download
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