fsck reports errors on clean filesystem (mounted rw)

[Chuck Swiger]

On Sep 10, 2010, at 3:27 PM, cronfy wrote:
> 1. Can I be sure my filesystem is consistent?

Reasonably.

> 2. If fsck reports nonexistent errors (and probably will try to fix
> them if asked), isn't it even danger to run fsck on running system?

Running fsck in foreground mode on a mounted filesystem is not recommended.  

> 3. How can I check (not fix) filesystems while partitions are mouted
> rw and are under usage?

fsck -B...?  See "man fsck_ffs".

Regards,
-- 
-Chuck