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Subject: Re: zpool import -N mounts filesystems anyway
To: Christian Kujau <lists@nerdbynature.de>
Cc: David Christensen <dpchrist@holgerdanske.com>,
 freebsd-questions@freebsd.org
References: <7f41df25-df2e-298e-d33e-cc95874e831c@bluerosetech.com>
 <eb778163-8387-fd55-8e8f-d65ec221e6e8@holgerdanske.com>
 <d4b055f2-2273-6df8-fe55-640f3b56e04d@bluerosetech.com>
 <alpine.DEB.2.21.1.1706182222130.3364@trent.utfs.org>
From: Mel Pilgrim <list_freebsd@bluerosetech.com>
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Date: Mon, 19 Jun 2017 09:51:47 -0700
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On 06/18/2017 22:28, Christian Kujau wrote:
> 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?

Yes, the root dataset (and only the root dataset) gets mounted:

# zfs get -r canmount,mountpoint backupB
NAME        PROPERTY    VALUE                   SOURCE
backupB     canmount    noauto                  local
backupB     mountpoint  /backup-ext/backupB     local
backupB/z0  canmount    noauto                  local
backupB/z0  mountpoint  /backup-ext/backupB/z0  inherited from backupB

# zpool export backupB
# ls -l /backup-ext/backupB
total 0
# zpool import backupB
# ls /backup-ext/backupB
z0
# zfs list -ro name,mounted,mountpoint backupB
NAME        MOUNTED  MOUNTPOINT
backupB         yes  /backup-ext/backupB
backupB/z0       no  /backup-ext/backupB/z0