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Date:      Thu, 29 Sep 2016 07:28:52 +0100
From:      Matthew Seaman <matthew@FreeBSD.org>
To:        freebsd-questions@freebsd.org
Subject:   Re: complete clone/restore from a ZFS-based system replication stream
Message-ID:  <07f48d63-d527-3f44-8d13-95eb8269322d@FreeBSD.org>
In-Reply-To: <20160929022501.GA33088@admin.sibptus.transneft.ru>
References:  <20160926154720.GA75556@admin.sibptus.transneft.ru> <688eec35-bc7b-ae05-b765-106933b522d1@sentex.net> <20160928145137.GA27497@admin.sibptus.transneft.ru> <ee590b5a-36ff-6e99-3390-715587dbb5d7@sentex.net> <20160928154941.GB27823@admin.sibptus.transneft.ru> <0f4490dc-34e3-3caa-7aa7-a2a284ed0ffd@sentex.net> <CADqw_g%2B6rSXPs0-j2T8s0ey5mkgSR0GyfbgbyoevmkmkJwMhrw@mail.gmail.com> <20160928164601.GA28493@admin.sibptus.transneft.ru> <868tub1om1.fsf@WorkBox.Home> <20160929022501.GA33088@admin.sibptus.transneft.ru>

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From: Matthew Seaman <matthew@FreeBSD.org>
To: freebsd-questions@freebsd.org
Message-ID: <07f48d63-d527-3f44-8d13-95eb8269322d@FreeBSD.org>
Subject: Re: complete clone/restore from a ZFS-based system replication stream
References: <20160926154720.GA75556@admin.sibptus.transneft.ru>
 <688eec35-bc7b-ae05-b765-106933b522d1@sentex.net>
 <20160928145137.GA27497@admin.sibptus.transneft.ru>
 <ee590b5a-36ff-6e99-3390-715587dbb5d7@sentex.net>
 <20160928154941.GB27823@admin.sibptus.transneft.ru>
 <0f4490dc-34e3-3caa-7aa7-a2a284ed0ffd@sentex.net>
 <CADqw_g+6rSXPs0-j2T8s0ey5mkgSR0GyfbgbyoevmkmkJwMhrw@mail.gmail.com>
 <20160928164601.GA28493@admin.sibptus.transneft.ru>
 <868tub1om1.fsf@WorkBox.Home>
 <20160929022501.GA33088@admin.sibptus.transneft.ru>
In-Reply-To: <20160929022501.GA33088@admin.sibptus.transneft.ru>

--MstvmSBHlgogQi4iXHFnfd1IpdcrdMVo6
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On 29/09/2016 03:25, Victor Sudakov wrote:
> 1. You attach a second disk, it becomes ada1. You create ada1p2 for
> swap and ada1p3 for zfs.
>=20
> 2. You create a zpool on ada1p3. "zpool status" shows ada1p3 as the phy=
sical
> device.
>=20
> 3. You move the disk to another system. It boots, and being unable to
> find ada1p3, loader(?) becomes desperate and uses
> /dev/diskid/BLA-BLA-BLAp3 as the physical device for the root pool.
>=20
> 4. Once the diskid label is in use, there is no more ada1p3 or ada0p3
> or whatever. It gets hidden.=20
>=20
> 5. You curse aloud and use /dev/diskid/BLA-BLA-BLAp2 for swap because n=
o
> device nodes and no other labels are available and there is no way to
> make them visible or create more human-friendly labels for partitions.

But /dev/ada1p2 or /dev/ada0p2 will still be visible, so you can tell
your system to swap there...

Even better, if you use gpart labels, in which case you'll have a
/dev/gpt/swap whoes name will remain constant irrespective of which of
ada0 or ada1 the disk ends up as.  This is the default setup created by
the installer.

	Cheers,

	Matthew



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