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Date:      Wed, 26 Jan 2011 21:12:57 +0100
From:      Christer Solskogen <christer.solskogen@gmail.com>
To:        Dan Nelson <dnelson@allantgroup.com>
Cc:        "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, freebsd-questions@freebsd.org
Subject:   Re: FreeBSD 9/ZFS: Striped Pool (2 disks) migrating to mirror (onto additional disk)
Message-ID:  <AANLkTimgbVvsFjc-FSdSoKe3cC6uNYNavvL1-WaCRSn4@mail.gmail.com>
In-Reply-To: <20110126195800.GM75125@dan.emsphone.com>
References:  <4D3FDE82.4000105@mail.zedat.fu-berlin.de> <AANLkTi=udjU-MKEU+AHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com> <20110126195800.GM75125@dan.emsphone.com>

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On Wed, Jan 26, 2011 at 8:58 PM, Dan Nelson <dnelson@allantgroup.com> wrote=
:
> In the last episode (Jan 26), Christer Solskogen said:
>> On Wed, Jan 26, 2011 at 9:42 AM, O. Hartmann wrote:
>> > My question is: is it possible to migrate the two-disk pool without da=
ta
>> > loss into a mirrored pool by adding the one 2TB-disk?
>>
>> No, you cant create a two-way mirror of three disks with ZFS. The only w=
ay
>> of doing what you want by creating a gmirror (or by hardware raid) of th=
e
>> two 1TB disks.
>
> You can, if you partition the 2tb disk into two smaller volumes, each the
> same size as one of the 1tb disks, then add one of those as a mirror of e=
ach
> original disk. =A0You'll end up with two mirrored vdevs in the pool.
> Performance probably won't be as good as a real mirror, though, since zfs
> doesn't know that two of its physical disks share a spindle.
>

Rememer that he also asked to do this without data loss. As far as I
know you cant remove devices from a vdev. If he is willing to accept
data loss there are a lots of ways of doing it.

--=20
chs,



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