ZFS backup Q: send/recv and mountpoint property

[Gary Palmer]

On Fri, Aug 10, 2018 at 05:52:03PM +0300, Dmitry Morozovsky wrote:
> On Fri, 10 Aug 2018, Gary Palmer wrote:
> 
> > > > On my backup server I have two pools, zfsroot and data.  I think I set 
> > > > things up, and then exported data so that it's not auto-imported at boot.
> > > > I then put this in /etc/rc.local
> > > > 
> > > > zpool import -N -R /backups data
> > > > 
> > > > It lets the pool import filesystems with paths like / or /home
> > > > without over-writing the paths on the local system.
> > > 
> > > that would fit for "normal" case, but does not survive sudden reboot ;-)
> > > 
> > > I'm switching to zxfer for now; not ideal, but fair and usable enough
> > 
> > Hi,
> > 
> > I haven't tested reboot during sync, but I'm not sure why a sudden
> > reboot would cause issues - the -R should move mounts outside 
> > critical areas.  Could you elaborate please?
> 
> yes, that would be exactly the case I'm referring: reboot when your data pool 
> is *not* exported 

Hi Dmitry,

I don't think that's a problem.  I don't export the pool before rebooting,
I just shut down the box and boot it the next time I need to do a backup
The -R flag prevents the pool from being written to the cache file which
should stop import on boot.  Note that I'm running FreebSD 10.4-p<whatever> 
currently.  Need to upgrade to 11.2 and see if that still works.

Regards,

Gary