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Date:      Wed, 26 Jan 2011 12:17:47 +0000
From:      krad <kraduk@gmail.com>
To:        Christer Solskogen <christer.solskogen@gmail.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:  <AANLkTikUcJxe2n9na_Ptz5v5wyUrGjwE9NKEJ52O_Rce@mail.gmail.com>
In-Reply-To: <AANLkTi=udjU-MKEU+AHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com>
References:  <4D3FDE82.4000105@mail.zedat.fu-berlin.de> <AANLkTi=udjU-MKEU+AHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com>

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On 26 January 2011 09:21, Christer Solskogen
<christer.solskogen@gmail.com> wrote:
> On Wed, Jan 26, 2011 at 9:42 AM, O. Hartmann
> <ohartman@mail.zedat.fu-berlin.de> wrote:
>
>> My question is: is it possible to migrate the two-disk pool without data
>> 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
> way of doing what you want by creating a gmirror (or by hardware raid)
> of the two 1TB disks.
>
> --
> chs,
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>


ive not tried it but wouldn't you want to gstripe the two disks
together and then add the geom device to the pool? It sounds a bit
horrible to me and with the price of 2TB disks being ~ =A365-70 here in
the uk I wouldn't bother. Remember you will get a speed boost for
reads on a mirror.

WIth regards to the backup, the most efficient way would probably to
use zfs send and receive between the pools



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