zfs only mounting "root" after reboot

[Thomas Schweikle]

Hi!

I've managed to setup freebsd using zfs for root about one year ago.
Everything was fine until about three weeks ago. Since then the system
boot up, but doesn't mount the whole pool, but only zfs:zroot to "/".

Here is my config:
# zpool status
  pool: zroot
 state: ONLINE
status: Some supported features are not enabled on the pool. The
pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does
not support
        the features. See zpool-features(7) for details.
  scan: scrub repaired 0 in 0h20m with 0 errors on Sat Aug 16
09:48:37 2014
config:

        NAME                                          STATE     READ
WRITE CKSUM
        zroot                                         ONLINE       0
    0     0
          gptid/9b82dab2-fae0-11e3-91bd-005056a52112  ONLINE       0
    0     0

errors: No known data errors

# zfs mount
zroot                           /

after booting into single user, then issuing "zfs mount -a":
zfs mount
zroot                           /
zroot/tmp                       /tmp
zroot/usr                       /usr
zroot/usr/home                  /usr/home
zroot/usr/ports                 /usr/ports
zroot/usr/ports/distfiles       /usr/ports/distfiles
zroot/usr/ports/packages        /usr/ports/packages
zroot/usr/src                   /usr/src
zroot/var                       /var
zroot/var/crash                 /var/crash
zroot/var/db                    /var/db
zroot/var/db/pkg                /var/db/pkg
zroot/var/empty                 /var/empty
zroot/var/log                   /var/log
zroot/var/mail                  /var/mail
zroot/var/run                   /var/run
zroot/var/tmp                   /var/tmp

This looks ways better. CTRL-D makes the system boot to full multiuser.

# zfs list
NAME                        USED  AVAIL  REFER  MOUNTPOINT
zroot                      21.6G  49.6G  1.43G  legacy
zroot/tmp                   402M  49.6G   402M  /tmp
zroot/usr                  17.5G  49.6G  12.1G  /usr
zroot/usr/home              288K  49.6G   288K  /usr/home
zroot/usr/ports            3.15G  49.6G  1.85G  /usr/ports
zroot/usr/ports/distfiles  1.30G  49.6G  1.30G  /usr/ports/distfiles
zroot/usr/ports/packages    144K  49.6G   144K  /usr/ports/packages
zroot/usr/src              2.26G  49.6G  2.26G  /usr/src
zroot/var                  2.20G  49.6G  2.06G  /var
zroot/var/crash            55.4M  49.6G  55.4M  /var/crash
zroot/var/db               89.0M  49.6G  24.3M  /var/db
zroot/var/db/pkg           64.7M  49.6G  64.7M  /var/db/pkg
zroot/var/empty             144K  49.6G   144K  /var/empty
zroot/var/log               472K  49.6G   472K  /var/log
zroot/var/mail              144K  49.6G   144K  /var/mail
zroot/var/run               300K  49.6G   300K  /var/run
zroot/var/tmp               532K  49.6G   532K  /var/tmp

In /boot/loader.conf:
# cat /boot/loader.conf
zfs_load="YES"
vfs.root.mountfrom="zfs:zroot"

looks OK so far. "/boot/zpool.cache" does exist too:
# ll /boot/zpool.cache
-rw-r--r--  1 root  wheel  1184 Jun 23 16:32 /boot/zpool.cache

And fstab doesn't reference zfs at all:
# cat /etc/fstab
# Device        Mountpoint              FStype          Options
 Dump    Pass#
/dev/acd0       /cdrom                  cd9660          ro,noauto
 0       0
#
linproc         /compat/linux/proc      linprocfs       rw,noauto
 0       0
fdesc           /dev/fd                 fdescfs         rw,noauto
 0       0

#
/dev/gpt/swap0  none                    swap            sw
 0       0

Since it worked for a long time and nothing really changed -- what
might be missing zfs not automounting the whole pool "zroot" at
bootup, only mounting zfs:zroot? And since google wasn't helpful at
all -- how to fix this?

-- 
Thomas