Data loss when hard shutdown!

[Ronald Klop]

On Sat, 02 Oct 2010 14:19:12 +0200, Phan Quoc Hien  
<phanquochien at gmail.com> wrote:

> Thanks for your respond.!
> Yes. I pulled the power plug .
> I edited rc.conf and save it then pulling the power plug. And system boot
> next time rc.conf is a blank file...!

Don't pull the power plug if you don't have to. The command to reboot is  
'shutdown -r now' and than all pending data will be saved safely.

Ronald.

> On Sat, Oct 2, 2010 at 7:02 PM, Ronald Klop  
> <ronald-freebsd8 at klop.yi.org>wrote:
>
>> On Sat, 02 Oct 2010 13:28:59 +0200, Phan Quoc Hien  
>> <phanquochien at gmail.com>
>> wrote:
>>
>>  hello everybody.
>>> I'm new to freebsd, When I hard shutdown my freebsd box..it caused lost
>>> 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
>> consistency of metadata (filenames, directory structures, etc.) after a
>> crash. However it is possible to loose the last X seconds of unwritten  
>> data.
>> That can be the complete contents of a new file.
>>
>> If it is really important you can mount your filesystem 'sync' see 'man
>> mount' in which case it will become slow, but more up-to-date.
>>
>> Ronald.
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>
>