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Date:      Thu, 18 May 2017 09:18:02 -0500
From:      "Eric A. Borisch" <eborisch@gmail.com>
To:        Paul Kraus <paul@kraus-haus.org>
Cc:        FreeBSD Stable <freebsd-stable@freebsd.org>,  =?UTF-8?Q?Trond_Endrest=C3=B8l?= <Trond.Endrestol@fagskolen.gjovik.no>,  "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>
Subject:   Re: zpool imported twice with different names (was Re: Fwd: ZFS)
Message-ID:  <CAASnNnruVeO%2BO6xOOfmEHo_ftL%2BurV%2BXcVAScOfuDs1TQD7uQQ@mail.gmail.com>
In-Reply-To: <CAASnNnrbXZRPHn6qYx%2BWctjm7Z1XJVCQSQyjHRKkq7KTzGP1VQ@mail.gmail.com>
References:  <7c059678-4af4-f0c9-ff3b-c6266e02fb7a@gmx.com> <adf4ab9f-72f1-ed0f-fee2-82caba3af4a4@gmx.com> <ca7b47a7-7512-3cbb-d47b-6ef546dffd74@gmx.com> <alpine.BSF.2.21.1705160825130.40966@mail.fig.ol.no> <CAASnNnrwTuJkMG2p%2BcXoKVfRQKnA5NccRGodwNUdCyG5j-L_LA@mail.gmail.com> <2318D9EB-4271-42C8-AEDB-4BB86607BB3D@kraus-haus.org> <CAASnNnpXaXmRHi97Fo4wE_VLT39O50kOaa8WvMk00doxMfxFQQ@mail.gmail.com> <81774CB0-9E06-43AF-B58B-259234111D61@kraus-haus.org> <CAASnNnrbXZRPHn6qYx%2BWctjm7Z1XJVCQSQyjHRKkq7KTzGP1VQ@mail.gmail.com>

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On Wed, May 17, 2017 at 9:38 PM, Eric A. Borisch <eborisch@gmail.com> wrote:

> 4) zpool import -f alpha beta succeeds without any complaints.
>
> IV. Alpha no longer exists, Beta exists (with the same GUID as Alpha) AND
> is active. This is an 'atomic' operation from user's point of view, and at
> no point does zpool list show more than one pool
>
> 5) zpool list shows only beta; scrubs fine, life is good..
>
> V. Beta exists on disk and is active and healthy. Alpha is no more.
> (Except as a ghost in a cache file)
>

A quick test revealed one other tidbit this morning; if I 'zpool export
beta' at this point in the process (still in live CD OS), everything is OK
on reboot into the installed OS.

For whoever wants to investigate handling/hand-off between
bootloader/kernel/fully booted, the problem appears when a:

1) root pool is renamed, but not 'zpool export'-ed after rename via an
'external' OS (live CD)
** and **
2) A stale zpool.cache file exists on the pool referring to the original
name.

 - Eric



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