Date: Sun, 18 Jun 2017 01:24:15 -0700 From: Mel Pilgrim <list_freebsd@bluerosetech.com> To: David Christensen <dpchrist@holgerdanske.com>, freebsd-questions@freebsd.org Subject: Re: zpool import -N mounts filesystems anyway Message-ID: <d4b055f2-2273-6df8-fe55-640f3b56e04d@bluerosetech.com> In-Reply-To: <eb778163-8387-fd55-8e8f-d65ec221e6e8@holgerdanske.com> References: <7f41df25-df2e-298e-d33e-cc95874e831c@bluerosetech.com> <eb778163-8387-fd55-8e8f-d65ec221e6e8@holgerdanske.com>
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On 06/17/2017 20:59, David Christensen wrote: > On 06/17/17 17:00, Mel Pilgrim wrote: >> I need to import a pool without mounting its filesystems, but when I use >> the -N argument to zpool import to, per the man page, "Import the pool >> without mounting any file systems", it mounts the filesystems anyway. >> >> I've tried search for an answer to this, but the question is too >> ambiguous to get a decent search result. >> >> How do I tell ZFS to not mount anything on import? > > Which version of FreeBSD? 11.0-RELEASE-p7 The pools and filesystems are all at current feature sets and versions. > My man 8 zpool shows three forms for import: > > zpool import [-d dir | -c cachefile] [-D] > zpool import [-o mntopts] [-o property=value] ... [-d dir | -c > cachefile] > [-D] [-f] [-m] [-N] [-R root] [-F [-n]] -a > zpool import [-o mntopts] [-o property=value] ... [-d dir | -c > cachefile] > [-D] [-f] [-m] [-N] [-R root] [-F [-n]] pool | id [newpool] > > > Only the latter two offer -N. Both forms that accept -N use it to import without mounting any filesystems. > It might help if you showed your console session -- exact command, exact > output. # 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 # zfs get canmount,mountpoint backupA NAME PROPERTY VALUE SOURCE backupA canmount on local backupA mountpoint /backup-ext/backupA local It appears -N is ignored and the presence of canmount=on and mountpoint being set results in automatic mounting regardless of whether or not -N is given to the zpool import command. The expected behaviour is that -N overrides canmount and mountpoint, leaving all filesystems in the pool unmounted. Currently, I work around this by setting mountpoint=none at the root prior to exporting (all datasets inherit mountpoint). I would prefer to leave mountpoint set so that the automated task that uses the pools just has to import and export them without twiddling properties.
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