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?

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

thanks,

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