[linux-lvm] Use lvcreart -m to make a mirror

[Fang,Dongyu]

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?
Thanks.
    Fang,Dongyu
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