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Date:      Fri, 28 Apr 2017 17:53:20 -0400
From:      Ultima <>
To:        Paul Macdonald <>
Cc:        FreeBSD Mailing List <>
Subject:   Re: A seperate ZFS question
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <> <>

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You have a fairly small pool, I highest suggest fixing the issue instead of
ignoring it. This kind of issue makes bad days worse when ignored. =3D[

If no spare drives are available, it maybe best to detach one of the mirror
devices, create a new pool with the single drive, move the data to it,
there have replies with good zfs send | zfs receive suggestions. After that
is complete, destroy the old pool and attach/add (with -n first) destroyed
pool's drives to your needs.

You are still in a minimal damage/recovery opportunity, and I would most
definitely suggest use it as a learning experience instead of putting it

Whatever you decide, I wish you the best


On Fri, Apr 28, 2017 at 5:19 PM, Paul Macdonald <> wrote:

> On 28/04/2017 15:51, Steve O'Hara-Smith wrote:
>> On Fri, 28 Apr 2017 15:52:59 +0200 (CEST)
>> Trond Endrest=C3=B8l <> 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 reache=
> its capacity to fix this)
> thanks to all for the comments/guidance
> Paul.
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