Date: Fri, 22 Sep 2017 09:14:53 +0000 From: Wiktor Niesiobedzki <bsd@vink.pl> To: Andriy Gapon <avg@freebsd.org>, freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZVOL with volblocksize=64k+ results in data corruption [was Re: Resolving errors with ZVOL-s] Message-ID: <CAH17caXVga88a5CK53LiRGqvTf-SCNhKvm8P1ipc_a-Q4fBfsA@mail.gmail.com> In-Reply-To: <062dfcf9-b56e-c6c4-4039-c48bf7bdd610@FreeBSD.org> References: <CAH17caX=10DsuQo3KQnR31B%2B2M54-yj0RUtz6WQBivqfBokWdw@mail.gmail.com> <062dfcf9-b56e-c6c4-4039-c48bf7bdd610@FreeBSD.org>
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On Fri, 22 Sep 2017 at 10:48, Andriy Gapon <avg@freebsd.org> wrote: > On 21/09/2017 23:00, Wiktor Niesiobedzki wrote: > > I've conducted additional tests. It looks like when I create volumes with > > following commands: > > # zfs create -V50g -o volmode=dev -o volblocksize=64k -o compression=off > -o > > com.sun:auto-snapshot=false tank/test > > # zfs create -V50g -o volmode=dev -o volblocksize=128k -o compression=off > > -o com.sun:auto-snapshot=false tank/test > > > > I'm able to get checksum errors quite reliably in 2-12h of normal work of > > the volume. I tested also different volbocksizes: > > # zfs create -V50g -o volmode=dev -o volblocksize=32k -o compression=off > -o > > com.sun:auto-snapshot=false tank/test > > # zfs create -V50g -o volmode=dev -o volblocksize=8k -o compression=off > -o > > com.sun:auto-snapshot=false tank/test > > # zfs create -V50g -o volmode=dev -o volblocksize=4k -o compression=off > -o > > com.sun:auto-snapshot=false tank/test > > > > And gave them more than 24h of work with no apparent errors (I also moved > > other volumes to 4k and they did not show any checksum errors for more > than > > 2 weeks). > > > > I was running with volblocksize=128k from January this year. The problem > > started to appear only after I updated from 11.0 to 11.1. > > > > Should I file bug report for this? What additional information should I > > gather? > > Are you able to patch your version of FreeBSD? > Could you please try https://svnweb.freebsd.org/changeset/base/323918 > and see if it makes things better? > Yes, I'll give it a try for a weekend and let you know about the result. Cheers, Wiktor
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