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Date:      Wed, 26 Jan 2011 21:47:15 +0100
From:      Christer Solskogen <>
To:        Dan Nelson <>
Cc:        "O. Hartmann" <>,
Subject:   Re: FreeBSD 9/ZFS: Striped Pool (2 disks) migrating to mirror (onto additional disk)
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <> <> <>

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On Wed, Jan 26, 2011 at 9:42 PM, Dan Nelson <> wrote=

> ZFS lets you add and detach mirrors on the fly, since you're not changing
> the capacity of the pool itself. =A0Sure, you're going to lose the conten=
ts of
> the large 2TB drive, but that's sort of assumed. =A0You can't convert 4TB=
> 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.
> =A0zpool attach [-f] pool device new_device

The problem is that you cant attach a drive to a vdev that consists of
two striped disks.


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