Date: Fri, 21 Jun 2019 15:36:38 -0700 From: "Simon J. Gerraty" <sjg@juniper.net> To: Alan Somers <asomers@freebsd.org> Cc: Scott Long <scottl@samsco.org>, Don Lewis <truckman@freebsd.org>, "Chuck Silvers" <chs@netflix.com>, Kirk McKusick <mckusick@mckusick.com>, "FreeBSD CURRENT" <freebsd-current@freebsd.org>, <sjg@juniper.net> Subject: Re: Reducing UFS corruption from unclean shutdowns? Message-ID: <18782.1561156598@kaos.jnpr.net> In-Reply-To: <CAOtMX2heRbFONA4e7-buFgZeykCW13h1dC1DTVYOLFAier8wPg@mail.gmail.com> References: <CAOtMX2jPut4ve-Tr7DyikxXqnmqycyjEUpNmAiwUSXbQrK3iCA@mail.gmail.com> <C3016BDF-4B51-4A59-94F2-CCBD0DC4562E@samsco.org> <CAOtMX2jXiaOWpVdEg3_nBYinJWd=iwN_38hQ4eMOocgs8dMWhQ@mail.gmail.com> <F93827F6-1B99-4BDD-B245-C9594AD28ED7@samsco.org> <tkrat.bc0479d0867a8175@FreeBSD.org> <D7FC707D-B863-47F2-9580-C07881AAC866@samsco.org> <CAOtMX2heRbFONA4e7-buFgZeykCW13h1dC1DTVYOLFAier8wPg@mail.gmail.com>
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Alan Somers <asomers@freebsd.org> wrote: > I would've thought that immediately following a sync(8), the > filesystem would be consistent. Why do I still see errors after a sync(8) does little more than tell the kernel to start flushing some pages - which the kernel would do anyway in about 30s So, it does not really ensure a clean filesystem if you are about to reboot - and certainly not if a panic is imminent. FWIW to minimize fs problems after doing package install on junos I run fsync on files and dirs I know are likely to have been updated and which need to be flushed to disk before reboot. Unlike sync(8), fsync(1) will not return until the I/O is done. You may still lose data after a sudden power cycle or panic, but less likely to be something critical.
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