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From: David Kirchner <dpk@dpk.net>
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To: user <user@dhp.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: how do I tell FreeBSD to sync, for real ?
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On 11/8/05, user <user@dhp.com> wrote:
> No, I'm not asking "why do I need to sync" ... I understand why I need to
> wait, or issue a sync command.  No problems there.
>
> What I am asking is, why is one issuance of `sync` not enough ?  Why is
> two not enough ?  Why do I need to issue 6 or 8 of them ?

Softupdates is why. If you disable softupdates (tunefs -n disable
/dev/whatever) you shouldn't have to worry about the sync delay any
more.

I do wish there was a way to force it to sync to disk on demand, though.