On Wed, 23 Sep 2009 23:20:22 +0200 (CEST), Alexander Best 
<alexbes...@math.uni-muenster.de> wrote:
> thx. i thought since / gets mounted read-only and fsck is able to check it
> with write access this would apply to read-only mountpoints in general.

Because fsck resides in /sbin, it is required - in SUM - that /
is mounted and accessible for program execution. The best solution
is to mount it ro (-r) to get minimal "interference", but generally,
only unmounted partitions should be fscked. The / partition is an
excelion due to a neccessary evil. :-)

(If you're running fsck from a live system CD, you usually don't
mount anything. Running fsck on rw-mounted partitions can cause
damage to the file systems and should be avoided.)

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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