how do I tell FreeBSD to sync, for real ?

[user]

On Tue, 8 Nov 2005, David Kirchner wrote:

> On 11/8/05, user <user at 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.


Yes, that is what I am looking for.  Well, a way besides:


sync ; sync ; sync ; sync ; sync ; sync ; echo "boy am I a jackass"

or:

mount -ur /mnt/fs ; mount -uw /mnt/fs ; echo "what a loser I am"