On Tue, Nov 06, 2012 at 09:38:18AM -0700, Stefan Behrens wrote:
> This patch series adds support for replacing disks at runtime.
> 
> It replaces the following steps in case a disk was lost:
>     mount ... -o degraded
>     btrfs device add new_disk
>     btrfs device delete missing
> 
> Or in case a disk just needs to be replaced because the error rate
> is increasing:
>     btrfs device add new_disk
>     btrfs device delete old_disk
> 
> Instead just run:
>     btrfs replace mountpoint old_disk new_disk
> 

This is just fantastic.  I'm pulling it down and doing a test
integration with RAID56.  More comments as I hash through things.

-chris
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