Thanks your replay.
How can I mount the "original" (mimage_0) or the "mirror" (mimage_1) 
single?
Because I want to verify it write/read data in both LV indeed.
And how can I remove the mirror relation between the two LV(let the 
"original" and "mirror" become two singe LV)?   (I use `lvconvert -m 0 
vg1/mirror1`  then LVs become one.)
    Fang,Dongyu

Patrick Caulfield wrote:

>Fang,Dongyu wrote:
>  
>
>>When I use `lvcreate -l 4 --mirrors 1 -n mirror1 /dev/vg1` want to
>>create  mirror LV, I got four LV:
>> ACTIVE            '/dev/vg1/mirror1' [16.00 MB] inherit
>> ACTIVE            '/dev/vg1/mirror1_mlog' [4.00 MB] inherit
>> ACTIVE            '/dev/vg1/mirror1_mimage_0' [16.00 MB] inherit
>> ACTIVE            '/dev/vg1/mirror1_mimage_1' [16.00 MB] inherit
>>I think the LV mirror1 is the origin LV, mirror1_mlog is log, the two
>>others should be images LV, so why there are two images(in my opinion,
>>it should be only one), and I how to use then? Can I mount it?
>>    
>>
>
>/dev/vg1/mirror1 is the device you mount, the _mimage_ are internal devices
>for LVM. You have the "original" (mimage_0) and the mirror (mimage_1).
>
>The later revisions of LVM will hide these from the lvscan & lvs commands.
>  
>