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From: Andreas Gruenbacher <agruenba@redhat.com>
To: fio@vger.kernel.org
Subject: fio verify and short writes
Date: Tue, 3 Dec 2019 16:23:46 +0100	[thread overview]
Message-ID: <CAHc6FU7ai7HPQA8PP31wkJzz6LYJEn97Z-nJXn=EgvDy0LoBtA@mail.gmail.com> (raw)

Hi,

I've run into a verify issue with fio in xfstest generic/300 [*]:

* The aio-dio-verifier thread in that test case writes 4k buffers and
then reads them back in.
* The filesystem has a block size if 1k.
* The test case is designed to run the filesystem out of space. When
that happens, some writes can end up short before they all fail with
-ENOSPC. (That doesn't seem to happen on ext4 or xfs filesystems with
a 1k block size --- possibly just because the test always runs on a
scratch filesystem --- but it does trigger on gfs2.)
* When the aio-dio-verifier thread reads a short 4k buffer back in,
part of the buffer will be zero-filled, so verification will fail.

This is with a current fio and kernel.

Any thoughts?

Thanks,
Andreas

[*] https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/tree/tests/generic/300



             reply	other threads:[~2019-12-03 15:25 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03 15:23 Andreas Gruenbacher [this message]
2019-12-19  3:42 ` fio verify and short writes Sitsofe Wheeler

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