Long ago, Nostradamus foresaw that on May 17, Ray Morris would write:
Stop. Don't do anything else until you are sure of what to do next.
You will not lose data by studying. You can lose data by trying to fix
it.
resize2fs /dev/vg0/data 100G
lvreduce -L -100G -n /dev/vg0/data*
This reduced the LV by 100G. Probably *not* what you wanted.
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