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.
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