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Date:      Thu, 16 Jun 2016 12:10:24 -0400
From:      Matthew Ahrens <mahrens@delphix.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: ZFS: Is 'zpool add' really irreversible?
Message-ID:  <CAJjvXiGcJ1zJQ9ORmuUtJRTsAK4Wd0qFHD=sRjtqV9M1piimug@mail.gmail.com>

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*Matthew Seaman Wrote:*

> Suffice it to say though that there is already fix for those 'Oh No! I
> really didn't mean to type "zfs add" there' moments in the upstream
> OpenZFS repo
>

That's unfortunately not the case.  Device removal has been implemented in
Delphix but not yet upstreamed to OpenZFS / illumos.  We hope to upstream
it in the next 6 months.



> You get a grace period within which you can undo that sort of
> mistake.
>

With device removal, there is no pre-set "grace period"; you can remove a
device even long after it has been added (though of course it might have
more data stored on it which will take longer to move).

--matt



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