ZFS with multiple boot/root pools

[Bryan Drewery]

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On 04/30/2012 04:07 PM, Peter Jeremy wrote:
> 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?
> 

'zfs set canmount=noauto' on all of your non-active datasets. This
will stop 'zfs mount -a' (/etc/rc.d/zfs) from mounting them. This
propery is *not* inherited, so you do need to set it on *all* of them
if you have set a specific mountpoint.

There's also a port sysutils/beadm for managing multiple boot
environments. Support for having children datasets in the environment
is still a work in progress. See also:
http://forums.freebsd.org/showthread.php?t=31662

Regards,
Bryan Drewery
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