vgoyal added a new comment to an issue you are following:
Thinking more about it. I think EXTRA_VOLUME_NAME is more intuitive. Reason being that
this script sets up thin pool volume as well and that's a container volume too. EXTRA
sort of makes it explicit
that this volume is on top regular volumes setup by this script.
IOW, when somebody sets up thin pool, that's a container volume too and it will be
confuse thin pool volume with container volume specified by CONTAINER_VOLUME_NAME.
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