Re: cephfs-journal-tool lead to data missing and show up

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On Thu, Jul 14, 2016 at 4:42 PM, txm <chunquanbijiasuo@xxxxxxx> wrote:
> I am a user of cephfs.
>
> Recently i met a problem by using the cephfs-journal-tool.
>
> There were some strange things happened below.
>
> 1.After use the cephfs-journal-tool and cephfs-table-tool(i came up with the "negative object nums” issues, so i tried these tools to repair the cephfs),i remount the cephfs.
> 2.Then i found that the old data(a directoy and a file under it) is missing.
> 3.But after i create a new file at the root of cephfs, the missing directory show up. Then i delete the new created file,the “missing directory”  disappeared soon.
> 4.So this is the problem, when i create something under the root of cephfs, the missing directory show up, when i delete it ,the “missing directory” disappeared.
>
> Here is my question:
> 1. I am not sure whether this damage is caused by cephfs-journal-tool?
> 2. If so, another question is , how this damage came up by using the cephfs-journal-tool and what should i do next to fix this problem?
>
> Apparently ,i didn’t lose my data, but this is strange after all.
>

This is likely caused by incorrect inode dirstat. The scrub
functionality of devel version MDS can fix it.

Yan, Zheng

>
>
>
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