zfs can't mount /usr after 9.1-release upgrade

Tom Worster fsb at thefsb.org
Wed Jul 10 16:42:52 UTC 2013

a freebsd box doesn't boot normally since upgrading from 9.1-rc3 to
9.1-release. it boots to the point that /usr is mounted, then errors

"mount: /usr: unknown special file or file system"

if i boot to single user, zfs mount -a manually, then it comes up fine.

what function key do i gotta press to make that not happen again?


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