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lvm commands

show physical volume

pvdisplay

show logical volume groups

vgdisplay

show logical volume

lvdisplay

resize logical volume

resize logical volume

lvextend -l +100%FREE <path to lv e.g.dev/fsilun/lvfsilun>
File descriptor 7 (pipe:[13154434]) leaked on lvextend invocation. Parent PID 3865: bash
  Size of logical volume fsilun/lvfsilun changed from 250.00 GiB (64000 extents) to 1000.00 GiB (256000 extents).
  Logical volume lvfsilun successfully resized

and than resize filesystem

resize2fs -p /dev/mapper/fsilun