Hi Matt,
you can use
zpool replace pond ad4
after removing your old disk.
The problem is, if something goes wrong during the replace, you might  
lose data, because you have to remove the redundant disk first.
Hope this helps,
ralf
Am 25.04.2008 um 16:42 schrieb [EMAIL PROTECTED]:

> [zfs-discuss] replace-in-place: cannot replace, device is
>       busy
> To: zfs-discuss@opensolaris.org
> Message-ID: <[EMAIL PROTECTED]>
> Content-Type: text/plain; charset=UTF-8
>
> Say I have a raidz of 3 disks: ad4 ad6 ad8
>
> I want to tell zfs that I am pulling ad4 and replacing it with a new  
> disk on the same controller, but I can't get it to release its hold  
> on ad4.
>
> [EMAIL PROTECTED]:/home/matt]# zpool offline pond ad4
> Bringing device ad4 offline
> [EMAIL PROTECTED]:/home/matt]# zpool replace pond ad4
> cannot replace ad4 with ad4: ad4 is busy
>
> 'remove' and 'detach' are only useful for inactive spares and  
> mirrors/vdevs respectively.
>
> In practice I am likely to have an empty SATA port, but I would like  
> to figure out how to replace in place too--what's the trick?
>
> (This is on freebsd 7, by the way.)

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