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From: Andrei Kolu <antik@bsd.ee>
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I performed performance testing with bonnie++ & blogbench in parallel.

# bonnie++ -d /mnt/ad0s4/test -u root -s 8192 -m jump

and system freezed on some point and restarted, now I can't mount this 
partition without fsck-ing first. In /var/log/messages I found this 
information:

Oct 25 01:47:22 PCBSD kernel: WARNING: R/W mount of /mnt/ad0s4 denied.  
Filesystem is not clean - run fsck
Oct 25 01:47:22 PCBSD kernel: WARNING: Expected rawoffset 0, found 113611680

It is usable again after filesystem "cleaning". Why it need fsck- it supposed 
to be reliable in circumstances like this one?