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Date:      Fri, 28 Apr 2017 16:13:21 +0100
From:      krad <kraduk@gmail.com>
To:        "Steve O'Hara-Smith" <steve@sohara.org>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: A seperate ZFS question
Message-ID:  <CALfReyfnZe89X6NkPX1Uu_8+yD7B7h+mKf_k0FeurWgLhF6atA@mail.gmail.com>
In-Reply-To: <20170428155105.563a2ee5192bb8a08f76ca9d@sohara.org>
References:  <adb1b78d-2e03-d561-dac2-7c5da9a53a1c@ifdnrg.com> <alpine.BSF.2.20.1704281532300.10691@mail.fig.ol.no> <20170428155105.563a2ee5192bb8a08f76ca9d@sohara.org>

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maybe you can

https://www.delphix.com/blog/delphix-engineering/openzfs-device-removal

it wont be easy though as its another OS to boot into, which may for a pool
upgrade.

Probably easier to backup and recreate



On 28 April 2017 at 15:51, Steve O'Hara-Smith <steve@sohara.org> wrote:

> On Fri, 28 Apr 2017 15:52:59 +0200 (CEST)
> Trond Endrest=C3=B8l <Trond.Endrestol@fagskolen.gjovik.no> wrote:
>
> > On Fri, 28 Apr 2017 14:14+0100, Paul Macdonald wrote:
> >
> > >
> > > I fat fingered adding a cache drive and was unable to remove the SSD
> > > cache drive (ada2)
> > First, you have gpt/zfs0 and ada1p3 in a mirrored configuration. Next,
> > you have ada2 striped (RAID 0) to the first pair of mirrors. This is a
> > very weird "RAID 1 + 0" combo. Guess what will happen when you lose
> > ada2!
> >
> > Maybe you should describe what you wanted to happen in the first
> > place.
>
>         He did, ada2 is supposed to be a cache drive, now it's a stripe.
>
> > I suggest you make good backups of this pool, destroy it, recreate it
> > properly, and restore the missing data.
>
>         Agreed, you can't undo adding a stripe.
>
> --
> Steve O'Hara-Smith <steve@sohara.org>
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