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I got it. #finding it is helpful to post question onto this site, even though there is no response yet.

It is related with targetcli.

> ls 
> cd backstore/block
> ls
> delete

Now lvs show the logical volume is not open any longer.

  volume-a7c7ef18-e52f-4149-b610-8a3f1c3751b1    cinder-volumes -wi-a----- 500.00g

I believe it can be deleted now.

While, it's a puzzle that consistency is not well maintained. I suspect there is some issue in Cinder internal.
Another thing to investigate.