Re: MDSs report damaged metadata

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Thanks for the advice and info regarding the error. 

I tried ` ceph tell mds.database-0 scrub start / recursive repair force` and it didn't help. Is there anything else I can try? Or manually fix the links?

Best,
Ricardo


-----Original Message-----
From: Patrick Donnelly <pdonnell@xxxxxxxxxx> 
Sent: Thursday, February 25, 2021 12:06 PM
To: ricardo.re.azevedo@xxxxxxxxx
Cc: ceph-users <ceph-users@xxxxxxx>
Subject: Re:  MDSs report damaged metadata

Hello Ricardo,

On Thu, Feb 25, 2021 at 11:51 AM <ricardo.re.azevedo@xxxxxxxxx> wrote:
>
> Hi all,
>
>
>
> My cephfs MDS is reporting damaged metadata following the addition 
> (and
> remapping) of 12 new OSDs.
> `ceph tell mds.database-0 damage ls` reports ~85 files damaged. All of 
> type "backtrace" which is very concerning.

It is not concerning, actually. This just indicates that the reverse link of the file's object data to its path in the file system is incorrect.

> ` ceph tell mds.database-0 scrub start / recursive repair` seems to 
> have no effect on the damage. What does this sort of damage mean? Is 
> there anything I can do to recover these files?

Scrubbing should correct it. Try "recursive repair force" to see if that helps. "force" will cause the MDS to revisit metadata that has been scrubbed previously but unchanged since then.

--
Patrick Donnelly, Ph.D.
He / Him / His
Principal Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D

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