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Date: Sun, 18 Jun 2017 22:28:22 -0700 (PDT)
From: Christian Kujau <lists@nerdbynature.de>
To: Mel Pilgrim <list_freebsd@bluerosetech.com>
cc: David Christensen <dpchrist@holgerdanske.com>, 
 freebsd-questions@freebsd.org
Subject: Re: zpool import -N mounts filesystems anyway
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On Sun, 18 Jun 2017, Mel Pilgrim wrote:
> # zpool list backupA
> cannot open 'backupA': no such pool
> # zpool import -N backupA
> # zpool list backupA
> NAME      SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
> backupA   696G   189G   507G         -     1%    27%  1.00x  ONLINE  -
> # zfs list backupA
> NAME         USED  AVAIL  REFER  MOUNTPOINT
> backupA      189G   486G    22K  /backup-ext/backupA

Are you sure that the pool is actually mounted at this point? On that 
Solaris 11.3 machine:

solaris0# zpool import -N foo
solaris0# zfs list foo
NAME  USED  AVAIL  REFER  MOUNTPOINT
foo    94K  9.78G    31K  /mnt/foo
solaris0# df -h /mnt/foo/
Filesystem             Size   Used  Available Capacity  Mounted on
rpool/ROOT/solaris     9.8G   3.3G       872M    80%    /

So, "zfs list" only lists the mountpoint-to-be:

solaris0# zfs list -o mountpoint,mounted foo
MOUNTPOINT  MOUNTED
/mnt/foo         no

HTH,
Christian.
-- 
BOFH excuse #17:

fat electrons in the lines