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Date:      Fri, 28 Apr 2017 18:34:28 +0200 (CEST)
From:      =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no>
To:        Ultima <ultima1252@gmail.com>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: A seperate ZFS question
Message-ID:  <alpine.BSF.2.20.1704281832500.10691@mail.fig.ol.no>
In-Reply-To: <CANJ8om59fCSy3Z2_BrX45Wd92Luu=pWM1nERU8jF9eAe9-FVKA@mail.gmail.com>
References:  <adb1b78d-2e03-d561-dac2-7c5da9a53a1c@ifdnrg.com> <alpine.BSF.2.20.1704281532300.10691@mail.fig.ol.no> <20170428155105.563a2ee5192bb8a08f76ca9d@sohara.org> <CALfReyfnZe89X6NkPX1Uu_8+yD7B7h+mKf_k0FeurWgLhF6atA@mail.gmail.com> <20170428163227.f68fa81dd05822bf38789ae4@sohara.org> <alpine.BSF.2.20.1704281814110.10691@mail.fig.ol.no> <CANJ8om59fCSy3Z2_BrX45Wd92Luu=pWM1nERU8jF9eAe9-FVKA@mail.gmail.com>

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On Fri, 28 Apr 2017 12:25-0400, Ultima wrote:

> I doubt it, the command has been implemented for awhile now, but is only
> for removing hot spares, cache, and log devices.

And top-level devices. Just checked with stable/11, r317153.

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Subject: Re: A seperate ZFS question
To: freebsd-questions@freebsd.org
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 <alpine.BSF.2.20.1704281532300.10691@mail.fig.ol.no>
 <20170428155105.563a2ee5192bb8a08f76ca9d@sohara.org>
From: Paul Macdonald <paul@ifdnrg.com>
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Date: Fri, 28 Apr 2017 22:19:33 +0100
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On 28/04/2017 15:51, Steve O'Hara-Smith wrote:
> On Fri, 28 Apr 2017 15:52:59 +0200 (CEST)
> Trond Endrestøl <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.
>

all this so far i knew,

It's an entirely unwanted config, and i'll likely just migrate either 
the data or the jails to another box, but  i'd hoped to understand what 
the config  meant under ZFS:

As i understand from comments,  i have effectively created a mis-sized 
RAID0 (stripe) between a SATA mirror set and a single SSD,

i'm now very glad i didn't just unplug the SSD drive and instead added a 
2nd SSD  for the actual cache

So i guess i have until the SSD fails (or presumably until the SSD 
reaches its capacity to fix this)

thanks to all for the comments/guidance

Paul.





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