Oh,thanks.
But when I use `lvconvert -m 1 vg1/lv1a`, it responsed "Adding mirror 
images is not supported yet."

Jonathan Brassow wrote:

>When it's ready, it will be 'lvconvert'.
>
> brassow
>
>On Wed, 2006-01-04 at 18:33 +0800, dfang wrote:
>  
>
>>How to add a mirror to an existing logical volume?
>>Use lvcreate or lvextend?
>>Thanks.
>>                                                                         
>>      Fang,Dongyu
>>
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>>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>>    
>>
>
>_______________________________________________
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>  
>