Proper way to remove a qemu-nbd-mounted volume usnig lvm

Leroy Tennison <leroy.tennison@xxxxxxxxxxx> · Sat, 22 Apr 2017 22:47:24 -0500



    I either haven't searched for the right thing or the web doesn't
      contain the answer.

    
    I have used the following to mount an image and now I need to
      know the proper way to reverse the process.
    
      qemu-nbd -c /dev/nbd0 <qcow2 image using lvm>
      vgscan --cache    (had to use --cache to get the qemu-nbd
        volume to be recognized, lvmetad is running)
      vgchange -ay
      lvdisplay
      mount <selected qemu-nbd related 'LV Path' found from
        lvdisplay above> <mount point>
    
    I have done the following:
    
      umount <mount point>
      lvchange -an <all qemu-nbd related 'LV Path's found from
        lvdisplay above>
      vgchange -an <qemu-nbd related volume>
    
    Now what?  How do I get the volume out of the list so I can use
      'qemu-nbd -d /dev/nbd0' to dis-associate the image with
      /dev/nbd0?  vgreduce seems to be for volumes which have multiple
      underlying devices.  I started to use vgremove but, when it
      started prompting for confirmation about removing logical volumes,
      I wasn't sure exactly what it was going to do and responded 'no'.
    If there is a web reference explaining this specific situation
      just point me to it - I'm not opposed to reading.  Thanks for the
      help.

    
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