On 2020/4/30 上午3:21, Chris Murphy wrote:
> On Wed, Apr 29, 2020 at 9:45 AM Michal Soltys <msoltyspl@yandex.pl> wrote:
>>
>> Short update:
>>
>> 1) turned out to not be btrfs fault in any way or form, as we recreated
>> the same issue with ext4 while manually checksumming the files; so if
>> anything, btrfs told us we have actual issues somewhere =)

Is that related to mixing buffered write with DIO write?

If so, maybe changing the qemu cache mode may help?

Thanks,
Qu

>>
>> 2) qemu/vm scenario is also not to be blamed, as we recreated the issue
>> directly on the host as well
>>
>> So as far as I can see, both of the above narrows the potential culprits
>> to either faulty/buggy hardware/firmware somewhere - or - some subtle
>> lvm/md/kernel issues. Though so far pinpointing the issue is proving
>> rather frustrating.
>>
>>
>> Anyway, sorry for the noise.
> 
> It's not noise. I think it's useful to see how Btrfs can help isolate
> such cases.
>