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Date:      Wed, 24 Feb 2021 09:42:56 +1100
From:      Peter Jeremy <peter@rulingia.com>
To:        Chris Anderson <cva@pobox.com>
Cc:        Andriy Gapon <avg@freebsd.org>, freebsd-stable@freebsd.org
Subject:   Re: lots of "no such file or directory" errors in zfs filesystem
Message-ID:  <YDWE8HhwEqW17unG@server.rulingia.com>
In-Reply-To: <CADuGiuP%2B2VM77hmpoRsRq40POy6Xa8VE1bp0R8AS7UcgzzH8Sw@mail.gmail.com>
References:  <CADuGiuPo2nMtGs=p5FM6H0kQwdXvfTYYrxaiYSC0rjDNo_eBgA@mail.gmail.com> <48b78acb-7667-7829-8dd0-e753b7ac3336@FreeBSD.org> <CADuGiuPaxLHN3zqR%2BLrEZ2E9r=cjqS7KhV_LDAHN_wK2fJ-%2Btw@mail.gmail.com> <ce5e5114-2640-bbb9-bfaa-ea148afb403d@FreeBSD.org> <CADuGiuMqCvja%2ByCo4%2BEC1tZYkjFAe7xeCyeejKAJK78PM8xddA@mail.gmail.com> <eec72c47-5aaf-c1ed-96d0-7ebba087623e@FreeBSD.org> <CADuGiuP%2B2VM77hmpoRsRq40POy6Xa8VE1bp0R8AS7UcgzzH8Sw@mail.gmail.com>

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On 2021-Feb-23 11:30:58 -0600, Chris Anderson <cva@pobox.com> wrote:
>nope, it led a pretty boring life. that zfs filesystem was created on that
>server and has been on the same two mirrored disks for its lifetime.

Does the server have ECC RAM?  Possibly it's a bitflip somewhere before
the data got to disk.

>prior to the upgrades) the server does have a relatively modest amount of
>ram (2GB). dunno if that makes it more likely that these kinds of issues
>get triggered.

Low amounts of RAM are going to increase the IO load but shouldn't
otherwise impact the filesystem consistency.  I have a FreeBSD test
system that's running ZFS in <1GB RAM and rebuilding itself daily for
multiple years and haven't run into any ZFS corruption issues.

--=20
Peter Jeremy

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