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Date:      Wed, 26 Jan 2011 22:57:24 +0100
From:      "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>
To:        Christer Solskogen <christer.solskogen@gmail.com>
Cc:        Dan Nelson <dnelson@allantgroup.com>, freebsd-questions@freebsd.org
Subject:   Re: FreeBSD 9/ZFS: Striped Pool (2 disks) migrating to mirror (onto additional disk)
Message-ID:  <4D4098C4.6000105@mail.zedat.fu-berlin.de>
In-Reply-To: <AANLkTimJwT6pShtC2c-O2=a=78LBB8+m=WoFQXTkOqk9@mail.gmail.com>
References:  <4D3FDE82.4000105@mail.zedat.fu-berlin.de> <AANLkTi=udjU-MKEU+AHU2DyyLL3sMVcKbT3WsLGW7YTN@mail.gmail.com> <20110126195800.GM75125@dan.emsphone.com> <AANLkTimgbVvsFjc-FSdSoKe3cC6uNYNavvL1-WaCRSn4@mail.gmail.com> <20110126204233.GN75125@dan.emsphone.com> <AANLkTimJwT6pShtC2c-O2=a=78LBB8+m=WoFQXTkOqk9@mail.gmail.com>

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On 01/26/11 21:47, Christer Solskogen wrote:
> On Wed, Jan 26, 2011 at 9:42 PM, Dan Nelson<dnelson@allantgroup.com>  wrote:
>
>> ZFS lets you add and detach mirrors on the fly, since you're not changing
>> the capacity of the pool itself.  Sure, you're going to lose the contents of
>> the large 2TB drive, but that's sort of assumed.  You can't convert 4TB of
>> non-mirrored disks into 2TB of mirrored disks without losing 2TB of space.
>> Just make sure you have less than 2TB total used data on all volumes, and
>> copy the data off the 2TB filessytem onto the striped 1+1TB one before
>> repartitioning and adding the mirrors.
>>
>>   zpool attach [-f] pool device new_device
>>
>
> The problem is that you cant attach a drive to a vdev that consists of
> two striped disks.
>
All right, I see there is no way without any kind of trade-off.

My thinking was simple, I thought since the two physical 1TB disks build 
one joint pool of 2TB overall capacity, I could simply 'mirror' this 
pool to another disk of the same capacity.
Is there a way to 'send' via ZFS the data of the pool to the backup 
disk, like a snapshot from one pool to another one?

Oliver



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