Block Device Mapping is Invalid

asked 2017-08-01 12:52:02 -0500

Ben78 gravatar image

updated 2017-08-02 16:38:24 -0500

I have installed DevStack recently. When I try to create a new instance I get this error msg:"Block Device Mapping is Invalid". I found out that there is an item,"loop1", on my block device list which my total volume size is limited to the free space of it. In another word, when I try to create an instance with volume size larger than the free space of "loop1", I get the error message. How can I solve this problem? or how can I increase the loop1 volume size? https://i.stack.imgur.com/lnEWj.jpg (image description)

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IMO the easiest solution is creating another loop device and adding it to the volume group.

Bernd Bausch gravatar imageBernd Bausch ( 2017-08-01 22:10:37 -0500 )edit

Thanks for your time. May I know exactly how?

Ben78 gravatar imageBen78 ( 2017-08-02 13:29:11 -0500 )edit

For example (I haven't tried it; might be inaccurate):

# losetup -f
/dev/loop2
# fallocate -l 10G myloopfile
# losetup /dev/loop2 myloopfile
# pvcreate /dev/loop2
# vgextend cinder-volumes /dev/loop2

You can also look for losetup in the devstack log file for inspiration.

Bernd Bausch gravatar imageBernd Bausch ( 2017-08-02 19:31:41 -0500 )edit
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