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Date: Sun, 15 May 2011 09:44:57 -0400
From: Nick Ulen <uncle@wolfman.devio.us>
To: freebsd-geom@freebsd.org
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Subject: GELI,unexpectedly last close.
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There is zfs on label/tank.eli
 # grep geli /etc/rc.conf
geli_devices="label/tank"
geli_label_tank_flags="-k /root/keys/label_tank.key"

Immediately after booting:
# geli status label/tank.eli
          Name  Status  Components
label/tank.eli  ACTIVE  label/tank

After performing any of the commands zfs or zpool,
e.g.
zfs list
zpool import
etc,(ttyv0) show:
GEOM_ELI: Detached label/tank.eli on last close.

and indeed:
# ls -l /dev/label/tank.eli
ls: /dev/label/tank.eli: No such file or directory
It's weird for me, but not critical.The geli rc.d script works fine.Also 
geli_autodetach="NO" solves the problem.
FreeBSD 9.0-CURRENT,zfs v.28
Just a note.

Regards,
Nick