Re: Corrupted files support needed

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2019/4/15 下午7:44, Daniel Brunner wrote:
> Hi,
> 
> after normal a reboot I noticed that many files fail to open / read
> (Input/Output error). I don't really have a backup of it (only
> snapshots which also seem to be corrupted too).
> The machine is remote, I can only ssh into it (at the moment). The
> raid consists of 8x 10TB drives.
> 
> System & Metadata is RAID1
> Data is RAID6
> 
> kernel is the most recent from arch linux repositories:
> 5.0.7-arch1-1-ARCH #1 SMP PREEMPT Mon Apr 8 10:37:08 UTC 2019 x86_64 GNU/Linux
> 
> Disk layout & usage:
> https://0x0.st/zNBl.log
> 
> Output of btrfs check:
> https://0x0.st/zNJs.log

Strange, btrfs check reports no error at all.

Would you please try btrfs check unmounted just in case.

> 
> Kernel messages:
> http://cwillu.com:8080/84.115.44.105/2

According to the dmesg, it looks like one device is bad, affecting both
data and metadata.

And thanks to recent RAID6 enhancement to try all possible mirror
combination, it doesn't cause too many problem to metadata at least.

Although data csum is not that good.
Quite a lot of combination doesn't match checksum, and even more, some
check doesn't exist in csum tree.

An unmounted btrfs check is recommended.
# btrfs check --check-data-csum --readonly

This would be better than scrub.

And please check the SMART info, some devices look suspicious.

Also, please remount the fs read only at least to prevent further
corruption.

Thanks,
Qu

> 
> btrfs scrub is running but it seems like it will take weeks to finish...
> 
> Do you think my data is gone or is there anything I can try? An rsync
> is already running, but every 5th file fails to read.
> 
> Best regards,
> Daniel
> 


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