I have been researching on how to move disk space from /home to /root, and I thought I got it, but the lv-to-be-extended filesystem looks the same size after the procedure.
I unmounted /home, backed it up, deleted, and created a new one, formatted it and restored/mounted it.
All is good there, and now I have several Gs to spare.
I do lvextend on /dev/centos/root, operation returns "successful", but /root remains the same size.
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[root@support ~]# lvextend -L +200G /dev/centos/root
Size of logical volume centos/root changed from 50,00 GiB (12800 extents) to 250,00 GiB (64000 extents).
Logical volume centos/root successfully resized.
tia