On 09/06/2016 04:46 PM, Colin wrote:
> Thank you Benjamin.
>
> I ended doing the dd like:
> dd if=/dev/sdb1 | pv -s 400G | dd of=/dev/sdc1 bs=16M
>
> That took around 5h total, which was great!
> Being stuck with the same filesystem sucks but it seems without any
> bigger window of downtime, there isn't any tool that would be possible
> to use.
>
> Thank you all!
>
> Cheers,
> Colin
>

For future reference, there's Holger's script and this one I created for 
migrations such as your case:

http://johan.ehnberg.net/backuppc-pre-loading-seeding-and-migrating-moving-script/

Giving up the pool and backup history may not be feasible though, so 
beware: my script starts a fresh pool.

Best regards,
Johan Ehnberg

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