I have an LVM volume, with xfs on it, that is almost full:

$ df /scratch -h
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/vg-scratch    180G  175G  5.4G  98% /scratch

$ sudo lvdisplay /dev/mapper/vg-scratch
...
  LV Size                180.00 GB
...

But I have some more space in the physical volume. Let's grow the logical volume.

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