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From: "Ronald Klop" <ronald-freebsd8@klop.yi.org>
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Subject: Re: Data loss when hard shutdown!
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On Sat, 02 Oct 2010 13:28:59 +0200, Phan Quoc Hien =20
<phanquochien@gmail.com> wrote:

> hello everybody.
> I'm new to freebsd, When I hard shutdown my freebsd box..it caused lost=
 =20
> some
> file. I used UFS2. How can prevent that? or recovery my file?
> Thanks!
>

By hard shutdown you mean pulling the power plug?

UFS2 (and most other filesystems on other operating systems) guarantee =20
consistency of metadata (filenames, directory structures, etc.) after a =20
crash. However it is possible to loose the last X seconds of unwritten =20
data. That can be the complete contents of a new file.

If it is really important you can mount your filesystem 'sync' see 'man =20
mount' in which case it will become slow, but more up-to-date.

Ronald.