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Date:      Fri, 2 Dec 2022 08:15:04 +0100 (CET)
From:      Sysadmin Lists <sysadmin.lists@mailfence.com>
To:        questions@freebsd.org
Cc:        Andrea Venturoli <ml@netfence.it>
Subject:   Re: ZFS Permanent error <0xffffffffffffffff>:<0x0>
Message-ID:  <905137278.91788.1669965304646@fidget.co-bxl>
In-Reply-To: <2d897f57-5bdc-7497-d374-e7a536d9a440@netfence.it>
References:  <0ddaa537-ffa9-af0d-1a5a-1874a67ed2b5@netfence.it> <c4d43906-d8a7-8945-abab-4e6c81e2fc6f@freebsd.org> <5def1695-82b3-3441-c11a-d64ca0c7c30a@netfence.it> <255658040.26515.1669699637761@orville.co-bxl> <47265e09-3aa0-24fa-22cb-56e09bb524f0@netfence.it> <597333482.1125294.1669791240602@ichabod.co-bxl> <2d897f57-5bdc-7497-d374-e7a536d9a440@netfence.it>

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> ----------------------------------------
> From: Andrea Venturoli <ml@netfence.it>
> Sent: Thu Dec 01 16:50:09 CET 2022
> To: <sysadmin.lists@mailfence.com>
> Cc: <questions@freebsd.org>
> Subject: Re: ZFS Permanent error <0xffffffffffffffff>:<0x0>
> 
> 
> On 11/30/22 07:54, Sysadmin Lists wrote:
> 
> > IIRC, snapshots are valid entries. Perhaps the corrupted file is still
> > associated with other snapshots. You might need to use `zdb' to find it and
> > delete it from the filesystem
> 
> Thanks for your explanation, but this is beyond my skills currently 
> (i.e. unless I find a good tutorial on zdb).
> What should I be looking for?

Graham's suggestions look intriguing.
 
> If the file is associated to another snapshot, why doesn't it say the 
> name of this snapshot, instead of the deleted one?

I don't know. I'm not an OpenZFS developer, I'm just going off personal
experience with similar errors. IIRC, a snapshot was still holding onto the
corrupted file.

> In any case, you are saying my storage isn't exploding and I can live 
> with this harmless warning?
> If it's so, well, maybe it will go away someday as older automatical 
> snapshots are deleted.

I'd run a long smartctl test on the disks in your pool if I were you.

>   bye & Thanks
> 	av.


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