Re: I had an occasion that XFS is not able to fully detect or recover from severe file system corruption

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> It's also possible that the filesystem somehow got re-corrupted between
the runs.

For my case, the write back SSD caching device was removed permanently.
Somehow the xfs_repair did not fix all problems after the first pass.

Best regards,
Patrick

On Thu, Feb 2, 2017 at 3:58 AM, Eric Sandeen <sandeen@xxxxxxxxxxx> wrote:
> On 2/1/17 12:53 PM, Patrick Dung wrote:
>> Hi guys,
>>
>> The problem happened in last year. I do not have the corrupted file
>> system now. But I would like to discuss it. Any comment is welcomed.
>>
>> I was using Fedora 24. I had an XFS file system in an hard drive. I
>> had used some kind of  SSD write back caching on top of the hard
>> drive.
>>
>> Somehow the SSD was removed and when the system is rebooted, the XFS
>> file system could not be mounted.
>>
>> I run xfs_repair, it reported some files are corrupted. It had
>> completed the repair of file system and some files were corrupted.
>> Then I could mount the filesystem. I started using the existing files
>> that did not have corruption. After sometime, the file system stopped
>> again because it detected XFS file system is corrupted.
>>
>> Then I run xfs_repair again and it found additional files were still corrupted.
>>
>> So I have a question if xfs_repair is able to fully detect all files
>> that are corrupted by running xfs_repair only once.
>
> Yes, xfs_repair is intended to fix everything on the first pass.  Rarely,
> there are bugs when it does not.
>
> It's also possible that the filesystem somehow got re-corrupted between
> the runs.
>
> -Eric
>
>> Best regards,
>> Patrick
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