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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Dmitry Morozovsky <marck@rinet.ru>
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Cc: freebsd-hackers@freebsd.org, dan.naumov@gmail.com,
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Subject: Re: sysinstall, GJOURNAL and ZFS
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> to be more precise): inappropriate time of file system lock on snapshot
> creation. On not-too-big 300G ufs2 not-too-heavy loaded snapshot creation time
> is 20+ minutes, and 5+ from that file system blocked even on reads.  This looks
> unacceptable for me for any real use.

that's why i disable it. If you sum up time of total blocked and time of 
almost-blocked you will end with much more than fsck normally use with 
foreground check.