Question about forcing fsck at boottime

Mel Flynn mel.flynn+fbsd.questions at
Tue Mar 31 08:36:36 PDT 2009

On Tuesday 31 March 2009 14:24:11 RW wrote:
> On Tue, 31 Mar 2009 08:15:54 +0200
> Mel Flynn <mel.flynn+fbsd.questions at> wrote:
> > On Tuesday 31 March 2009 08:05:11 manish jain wrote:
> > > I am migrating from Linux and am still learning the basics of
> > > FreeBSD. One thing that I would to carry over from my Linux days is
> > > to force an fsck on all filesystems at system startup. On Linux,
> > > this was simply a matter of editing /etc/rc.sysinit. Things seem a
> > > bit more complicated in the BSD world. Can somebody please point me
> > > in the right direction ?
> >
> > fsck -p is done by default (meaning, filesystems are not fully
> > scanned if they are marked clean). If pruning fails, background_fsck
> > is checked, which will work on UFS systems with soft updates, but is
> > not recommended by many as it may leave some errors unchecked.
> I don't think that's quite right,  fsck -p is only done if
> background_fsck=NO, otherwise an fsck -pF is done instead. The
> latter does an fsck -p on filesystems that aren't eligible for
> background checking - usually root and any none UFS filesystems.

As far as I can tell, -F -p skips clean disks (-p) and defers to background 
when possible, though the manpage doesn't exclude your or my theory. ENOTIME 
to check the source.

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