From owner-freebsd-fs@FreeBSD.ORG  Wed Oct 29 19:18:52 2014
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Date: Wed, 29 Oct 2014 13:13:17 -0600
From: "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org>
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To: Johannes Totz <johannes@jo-t.de>
Subject: Re: Snapshots and what not to snapshot
References: <alpine.BSF.2.00.1410120128570.6601@woozle.rinet.ru>
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On 10/29/2014 12:08 PM, Johannes Totz wrote:
> On 11/10/2014 22:38, Dmitry Morozovsky wrote:
>> you have some tree of ZFS file systems, like
>>
>> pool/path/r
>> pool/path/jails
>> pool/path/jails/j1
>> pool/path/jails/j1/obj
>>

snapshots and ZFS replication is done against the ZFS namespace, not the
unix namespace.  Organize your filesystems in the ZFS tree based on how
you want to replicate/snapshot them, then use the ZFS mountpoint
property to put them in the unix namespace where you want them to appear.

For example the basic approach I use for client systems is a ZFS
namespace like POOL/UNIX for FreeBSD, POOL/BUSINESS for shared company
data, POOL/BACKUP for client system backup blobs, POOL/REPLICANT for the
replication workspace to use in keeping  hot-spare servers updated, etc.

Note that the root of the ZFS tree is empty, and that the root of the
unix tree is elsewhere.  I often keep more than one bootable unix system
root in a pool (for maintenance).

PS. Don't forget the zpool bootfs property.