On Wed, Jul 25, 2001 at 06:43:32PM +0200, salo wrote:
> hi,
> 
> i would like to ask how possibly dangerous is using 'async' option to mounting
> disks (ffs, softdeps).
> 
> from mount(1) napage:
> 
> async       All I/O to the file system should be done asyn-
>             chronously.  In the event of a crash, it is
>             impossible for the system to verify the integrity of
>             data on a file system mounted with this option.  You
>             should only use this option if you have an applica-
>             tion-specific data recovery mechanism, or are willing
>             to recreate the file system from scratch.
> 
> could it cause unrecoverable damage to filesystem or could i only lost data
> not currently written to disk?

The automatic fsck run at boot won't be able to correct it automatically.
You'll have to run 'fsck -y' and will eventually have a lot of files 
in /lost+found.
If you're a linux user you're used to that :)

> 
> is there any relevant profit using 'async' option in speeding up filesystem
> operations?

'async' isn't any faster than 'softdep' and softdep guarantee filesystem
integrity.

--
Manuel Bouyer <bouyer@antioche.eu.org>
--