ZFS with multiple boot/root pools

[Peter Jeremy]

I have boot/root on one ZFS pool and for recovery purposes keep a
second ZFS boot/root pool in case the first one becomes unbootable.

My problem is that:
1) A zpool must be imported to be bootable
2) Most ZFS root filesystems have absolute mountpoints specified
3) /etc/rc.d/zfs automounts all imported ZFS filesytems
results in double mounts of various filesystems.

Can anyone suggest a way to configure a zpool or set of filesystems
so that they will only be mounted if the root filesystem is within
the zpool.

I looked at the "zfs mount -a" in /etc/rc.d/zfs but there doesn't
appear to be a suitable alternative.  A variant that mounted all
automount filesystems within a specified list of zpools would work
but doesn't exist.

Any other suggestions?  How do other people handle this?

-- 
Peter Jeremy
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