Incremental pvmove

incremental_pvmove.sh

#! /bin/bash

####
# pvmove data in configurables sized extents amount
# More info about motivation and concept in
# https://grmontesino.blogspot.com/2022/02/incremental-pvmove.html
#
# Usage: incremental_pvmove.sh <LV> <Origin PV> <Dest. PV> []
####

LV="$1"
ORIG_PV="$2"
DEST_PV="$3"
EXTENTS="${4:-25000}"

START=$(lvs --noheadings -ao devices $LV | grep -oP "$ORIG_PV\(\K\d+(?=\))")

while true; do

  SIZE=$(lvs --noheadings --separator "|" -ao devices,seg_size_pe $LV \
    | grep "$ORIG_PV" | head -1 | cut -d"|" -f2)
  [ ${SIZE:=0} -gt $EXTENTS ] || EXTENTS=$SIZE

  if [ $EXTENTS -le 0 ]; then
    echo "* Finished!"
    break
  fi

  echo "* pvmove ${ORIG_PV}:${START}+${EXTENTS} $DEST_PV"
  pvmove ${ORIG_PV}:${START}+${EXTENTS} $DEST_PV

  START=$((START+EXTENTS))
done